National Emissions Standards for Hazardous Air Pollutants
Encyclopedia
The National Emissions Standards for Hazardous Air Pollutants (NESHAPs) are emissions standards
set by the United States
EPA
for an air pollutant
not covered by NAAQS
that may cause an increase in fatalities or in serious, irreversible, or incapacitating illness. The standards for a particular source category require the maximum degree of emission reduction that the EPA determines to be achievable, which is known as the Maximum Achievable Control Technology (MACT) http://www.epa.gov/ttn/atw/112dpg.html. These standards are authorized by Section 112 of the Clean Air Act and the regulations are published in 40 CFR
Parts 61 and 63.
For all listings above which contain the word "compounds" and for glycol ethers, the following applies: Unless otherwise specified, these listings are defined as including any unique chemical substance that contains the named chemical (i.e., antimony, arsenic, etc.) as part of that chemical's infrastructure.
X'CN where X = H' or any other group where a formal dissociation may occur. For example KCN or Ca(CN)2 Includes mono- and di- ethers of ethylene glycol
, diethylene glycol
, and triethylene glycol
R-(OCH2CH2)n -OR' where
Sources: USEPA's original list & Modifications
"Major" sources
are defined as sources that emit 10 tons per year of any of the listed toxic air pollutants, or 25 tons per year of a mixture of air toxics. These sources may release air toxics from equipment leaks, when materials are transferred from one location to another, or during discharge through emission stacks or vents
"Area" sources consist of smaller-size facilities that release lesser quantities of toxic pollutants into the air. Area sources are defined as sources that emit less than 10 tons per year of a single air toxic, or less than 25 tons per year of a combination of air toxics. Though emissions from individual area sources are often relatively small, collectively their emissions can be of concern - particularly where large numbers of sources are located in heavily populated areas.
The United States EPA published the initial list of "source categories" in 1992 (57FR
31576, July 16, 1992) and since that time has issued several revisions and updates to the list and promulgation schedule. For each listed source category, EPA indicates whether the sources are considered to be "major" sources or "area" sources. The 1990 Clean Air Act Amendments direct EPA to set standards for all major sources of air toxics (and some area sources that are of particular concern).
http://www.epa.gov/ttn/atw/pollsour.html
Specific MACT regulation summaries:
Emission standard
Emission standards are requirements that set specific limits to the amount of pollutants that can be released into the environment. Many emissions standards focus on regulating pollutants released by automobiles and other powered vehicles but they can also regulate emissions from industry, power...
set by the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
EPA
United States Environmental Protection Agency
The U.S. Environmental Protection Agency is an agency of the federal government of the United States charged with protecting human health and the environment, by writing and enforcing regulations based on laws passed by Congress...
for an air pollutant
Air pollution
Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere....
not covered by NAAQS
National Ambient Air Quality Standards
The National Ambient Air Quality Standards are standards established by the United States Environmental Protection Agency under authority of the Clean Air Act that apply for outdoor air throughout the country...
that may cause an increase in fatalities or in serious, irreversible, or incapacitating illness. The standards for a particular source category require the maximum degree of emission reduction that the EPA determines to be achievable, which is known as the Maximum Achievable Control Technology (MACT) http://www.epa.gov/ttn/atw/112dpg.html. These standards are authorized by Section 112 of the Clean Air Act and the regulations are published in 40 CFR
Code of Federal Regulations
The Code of Federal Regulations is the codification of the general and permanent rules and regulations published in the Federal Register by the executive departments and agencies of the Federal Government of the United States.The CFR is published by the Office of the Federal Register, an agency...
Parts 61 and 63.
Pollutants
The USEPA regulates the following hazardous air pollutants via the MACT standards:| CAS Number | Chemical Name | Notes |
|---|---|---|
| 75-07-0 | Acetaldehyde Acetaldehyde Acetaldehyde is an organic chemical compound with the formula CH3CHO or MeCHO. It is one of the most important aldehydes, occurring widely in nature and being produced on a large scale industrially. Acetaldehyde occurs naturally in coffee, bread, and ripe fruit, and is produced by plants as part... |
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| 60-35-5 | Acetamide Acetamide Acetamide is an organic compound with the formula CH3CONH2. It is the simplest amide derived from acetic acid. It finds some use as a plasticizer and as an industrial solvent... |
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| 75-05-8 | Acetonitrile Acetonitrile Acetonitrile is the chemical compound with formula . This colourless liquid is the simplest organic nitrile. It is produced mainly as a byproduct of acrylonitrile manufacture... |
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| 98-86-2 | Acetophenone Acetophenone Acetophenone is the organic compound with the formula C6H5CCH3. It is the simplest aromatic ketone. This colourless, viscous liquid is a precursor to useful resins and fragrances.-Production:Acetophenone can be obtained by a variety of methods... (Methyl Phenyl Ketone) |
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| 53-96-3 | 2-Acetylaminofluorene 2-Acetylaminofluorene 2-Acetylaminofluorene is a carcinogenic and mutagenic derivative of fluorene. It is used as a biochemical tool in the study of carcinogenesis. It induces tumors in a number of species in the liver, bladder and kidney.The metabolism of this compound in the body by means of biotransformation... |
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| 107-02-8 | Acrolein Acrolein Acrolein is the simplest unsaturated aldehyde. It is produced widely but is most often immediately reacted with other products due to its instability and toxicity... |
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| 79-06-1 | Acrylamide Acrylamide Acrylamide is a chemical compound with the chemical formula C3H5NO. Its IUPAC name is prop-2-enamide. It is a white odourless crystalline solid, soluble in water, ethanol, ether, and chloroform. Acrylamide is incompatible with acids, bases, oxidizing agents, iron, and iron salts... |
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| 79-10-7 | Acrylic acid Acrylic acid Acrylic acid is an organic compound with the formula CH2=CHCO2H. It is the simplest unsaturated carboxylic acid, consisting of a vinyl group connected directly to a carboxylic acid terminus. This colorless liquid has a characteristic acrid or tart smell. It is miscible with water, alcohols,... |
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| 107-13-1 | Acrylonitrile Acrylonitrile Acrylonitrile is the chemical compound with the formula C3H3N. This pungent-smelling colorless liquid often appears yellow due to impurities. It is an important monomer for the manufacture of useful plastics. In terms of its molecular structure, it consists of a vinyl group linked to a nitrile... |
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| 107-05-1 | Allyl chloride Allyl chloride Allyl chloride is the organic compound with the formula CH2=CHCH2Cl. This colorless liquid is insoluble in water but soluble in common organic solvents. It is mainly converted to epichlorohydrin, used in the production of plastics. It is a chlorinated derivative of propylene.-Production:Allyl... (3-Chloropropene) |
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| 92-67-1 | 4-Aminobiphenyl 4-Aminobiphenyl 4-Aminobiphenyl is an amine derivative of biphenyl. It is used to manufacture azo dyes. It is a known human carcinogen and so it has been largely replaced by less toxic compounds. It is similar to benzidine.... |
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| 62-53-3 | Aniline Aniline Aniline, phenylamine or aminobenzene is an organic compound with the formula C6H5NH2. Consisting of a phenyl group attached to an amino group, aniline is the prototypical aromatic amine. Being a precursor to many industrial chemicals, its main use is in the manufacture of precursors to polyurethane... |
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| 90-04-0 | o-Anisidine O-Anisidine o-Anisidine is a yellow liquid with melting point -1 to 5 °C and density 1.09 g/cm³. The vapor pressure is 0.05 mbar at 20 °C but increases greatly with temperature. It has an aromatic smell and is well absorbed by inhalation, oral ingestion and skin contact. 2-Anisidine is a very toxic agent that... |
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| 1332-21-4 | Asbestos Asbestos Asbestos is a set of six naturally occurring silicate minerals used commercially for their desirable physical properties. They all have in common their eponymous, asbestiform habit: long, thin fibrous crystals... |
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| 71-43-2 | Benzene Benzene Benzene is an organic chemical compound. It is composed of 6 carbon atoms in a ring, with 1 hydrogen atom attached to each carbon atom, with the molecular formula C6H6.... |
including benzene from gasoline |
| 92-87-5 | Benzidine Benzidine Benzidine, the trivial name for 4,4'-diaminobiphenyl, is the solid organic compound with the formula 2. This aromatic amine is a component of a test for cyanide and also in the production of dyes... |
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| 98-07-7 | Benzotrichloride Benzotrichloride Benzotrichloride, also known as trichlorotoluene is an organic compound with the formula C6H5CCl3. It is principally used as an intermediate in the preparation of other chemical products such as dyes.-Production and uses:... |
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| 100-44-7 | Benzyl chloride Benzyl chloride Benzyl chloride, or α-chlorotoluene, is an organic compound with the formula C6H5CH2Cl. This colourless liquid is a reactive organochlorine compound that is a widely used chemical building block.-Preparation:... |
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| 92-52-4 | Biphenyl Biphenyl Biphenyl is an organic compound that forms colorless crystals. It has a distinctively pleasant smell. Biphenyl is an aromatic hydrocarbon with a molecular formula 2... |
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| 117-81-7 | Bis(2-ethylhexyl)phthalate (DEHP) | |
| 542-88-1 | Bis(chloromethyl)ether | |
| 75-25-2 | Bromoform Bromoform Bromoform is a pale yellowish liquid with a sweet odor similar to chloroform, a halomethane or haloform. Its refractive index is 1.595 . Bromoform is produced naturally by phytoplankton and seaweeds in the ocean and this is thought to be the predominant source to the environment... (Tribromomethane) |
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| 106-99-0 | 1,3-Butadiene 1,3-Butadiene 1,3-Butadiene is a simple conjugated diene with the formula C4H6. It is an important industrial chemical used as a monomer in the production of synthetic rubber. When the word butadiene is used, most of the time it refers to 1,3-butadiene.... |
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| 156-62-7 | Calcium cyanamide Calcium cyanamide Calcium cyanamide or CaCN2 is a calcium compound used as fertilizer, first synthesized in 1898 by Adolph Frank and Nikodem Caro . It is formed when calcium carbide reacts with nitrogen. It is commercially known as Nitrolime.... |
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| 105-60-2 | Caprolactam Caprolactam Caprolactam is an organic compound with the formula 5CNH. This colourless solid is a lactam or a cyclic amide of caproic acid. Approximately 2 billion kilograms are produced annually... |
delisted on June 18, 1996 |
| 133-06-2 | Captan Captan Captan is the name of a general use pesticide that belongs to the phthalimide class of fungicides. Though it can be applied on its own, Captan is often added as a component of other pesticide mixtures. It is used to control diseases on a number of fruits and vegetables as well as ornamental plants... |
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| 63-25-2 | Carbaryl Carbaryl Carbaryl is a chemical in the carbamate family used chiefly as an insecticide. It is a white crystalline solid commonly sold under the brand name Sevin, a trademark of the Bayer Company. Union Carbide discovered carbaryl and introduced it commercially in 1958... |
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| 75-15-0 | Carbon disulfide Carbon disulfide Carbon disulfide is a colorless volatile liquid with the formula CS2. The compound is used frequently as a building block in organic chemistry as well as an industrial and chemical non-polar solvent... |
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| 56-23-5 | Carbon tetrachloride Carbon tetrachloride Carbon tetrachloride, also known by many other names is the organic compound with the formula CCl4. It was formerly widely used in fire extinguishers, as a precursor to refrigerants, and as a cleaning agent... (Tetrachloromethane) |
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| 463-58-1 | Carbonyl sulfide Carbonyl sulfide Carbonyl sulfide is the chemical compound with the formula OCS. Commonly written as COS, it is a colourless flammable gas with an unpleasant odor. It is a linear molecule consisting of a carbonyl group double bonded to a sulfur atom... |
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| 120-80-9 | Catechol Pyrocatechol Catechol, also known as pyrocatechol or 1,2-dihydroxybenzene, is an organic compound with the molecular formula C6H42. It is the ortho isomer of the three isomeric benzenediols. This colourless compound occurs naturally in trace amounts... |
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| 133-90-4 | Chloramben Chloramben Chloramben is a selective herbicide used to control the seedlings of broadleaf weeds and annual grasses. It is mostly used for soybeans, but also for dry beans, peanuts, sunflowers, peppers, cotton, sweet potatoes, squash, hardwood trees, shrubs, and some conifers.Chloramben is considered... |
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| 57-74-9 | Chlordane Chlordane Chlordane, or chlordan, is an organochlorine compound that was used as a pesticide. This white solid was sold in the U.S. until 1983 as an insecticide for crops like corn and citrus and on lawns and domestic gardens.-Production and uses:... |
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| 7782-50-5 | Chlorine Chlorine Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine... |
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| 79-11-8 | Chloroacetic acid Chloroacetic acid Chloroacetic acid, industrially known as monochloroacetic acid is the organochlorine compound with the formula ClCH2CO2H. This carboxylic acid is a useful building-block in organic synthesis.-Production:... |
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| 532-27-4 | 2-Chloroacetophenone CN gas Phenacyl chloride is a substituted acetophenone. It is a useful building block in organic chemistry. Apart from that, it has been historically used as a riot control agent, where it is designated CN.-Preparation:... |
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| 108-90-7 | Chlorobenzene Chlorobenzene Chlorobenzene is an aromatic organic compound with the chemical formula C6H5Cl. This colorless, flammable liquid is a common solvent and a widely used intermediate in the manufacture of other chemicals.-Uses:... |
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| 510-15-6 | Chlorobenzilate Chlorobenzilate Chlorobenzilate is a pesticide that is not currently used in the USA or Europe. It was originally developed by Ciba-Geigy and introduced in 1952. It was used as an acaricide against mites on citrus trees, including deciduous fruit trees. It has been detected as a residue on tomatoes found in... |
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| 67-66-3 | Chloroform Chloroform Chloroform is an organic compound with formula CHCl3. It is one of the four chloromethanes. The colorless, sweet-smelling, dense liquid is a trihalomethane, and is considered somewhat hazardous... (Trichloromethane) |
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| 107-30-2 | Chloromethyl methyl ether Chloromethyl methyl ether Chloroalkyl ethers are a class of organic compounds with the general structure R-O-n-Cl, characterized as an ether connected to a chloromethyl group via a alkane chain.Chloromethyl methyl ether is an ether with the formula... |
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| 126-99-8 | Chloroprene Chloroprene Chloroprene is the common name for the organic compound 2-chlorobuta-1,3-diene, which has the formula CH2=CCl-CH=CH2. This colorless liquid is the monomer for the production of the polymer polychloroprene, a type of synthetic rubber... |
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| 1319-77-3 | Cresol Cresol Cresols are organic compounds which are methylphenols. They are a widely occurring natural and manufactured group of aromatic organic compounds which are categorized as phenols . Depending on the temperature, cresols can be solid or liquid because they have melting points not far from room... s/Cresylic acid (isomers and mixture) |
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| 95-48-7 | o-Cresol Cresol Cresols are organic compounds which are methylphenols. They are a widely occurring natural and manufactured group of aromatic organic compounds which are categorized as phenols . Depending on the temperature, cresols can be solid or liquid because they have melting points not far from room... |
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| 108-39-4 | m-Cresol Cresol Cresols are organic compounds which are methylphenols. They are a widely occurring natural and manufactured group of aromatic organic compounds which are categorized as phenols . Depending on the temperature, cresols can be solid or liquid because they have melting points not far from room... |
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| 106-44-5 | p-Cresol Cresol Cresols are organic compounds which are methylphenols. They are a widely occurring natural and manufactured group of aromatic organic compounds which are categorized as phenols . Depending on the temperature, cresols can be solid or liquid because they have melting points not far from room... |
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| 98-82-8 | Cumene Cumene Cumene is the common name for isopropylbenzene, an organic compound that is an aromatic hydrocarbon. It is a constituent of crude oil and refined fuels. It is a flammable colorless liquid that has a boiling point of 152 °C... |
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| 94-75-7 | 2,4-D 2,4-Dichlorophenoxyacetic acid 2,4-Dichlorophenoxyacetic acid is a common systemic pesticide/herbicide used in the control of broadleaf weeds. It is the most widely used herbicide in the world, and the third most commonly used in North America... , salts and esters |
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| 3547-04-4 | Dichlorodiphenyldichloroethylene Dichlorodiphenyldichloroethylene Dichlorodiphenyldichloroethylene is a chemical compound formed by the loss of hydrogen chloride from DDT, of which it is one of the more common breakdown products. DDE is fat soluble which tends to build up in the fat of animals. Due to its stability in fat, DDE is rarely excreted from the body,... (DDE) |
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| 334-88-3 | Diazomethane Diazomethane Diazomethane is the chemical compound CH2N2. It is the simplest of diazo compounds. In the pure form at room temperature, it is a extremely sensitive explosive yellow gas, thus it is almost universally used as a solution in diethyl ether... |
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| 132-64-9 | Dibenzofuran Dibenzofuran Dibenzofuran, is a heterocyclic organic compound with the chemical structure shown at right. It is an aromatic compound that has two benzene rings fused to one furan ring in the middle. All of the numbered carbon atoms have a hydrogen atom bonded to each of them... s |
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| 96-12-8 | 1,2-Dibromo-3-chloropropane (DBCP) | |
| 84-74-2 | Dibutylphthalate Dibutyl phthalate Dibutyl phthalate is a commonly used plasticizer. It is also used as an additive to adhesives or printing inks. It is soluble in various organic solvents, e.g. in alcohol, ether and benzene... |
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| 106-46-7 | 1,4-Dichlorobenzene 1,4-Dichlorobenzene 1,4-Dichlorobenzene is an organic compound with the formula C6H4Cl2. This colorless solid has a strong odor. It consists of two chlorine atoms substituted at opposing sites on a benzene ring. p-DCB is used a pesticide and a deodorant, most familiarly in mothballs in which it is a replacement for... (p-Dichlorobenzene) |
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| 91-94-1 | 3,3'-Dichlorobenzidine 3,3'-Dichlorobenzidine 3,3'-Dichlorobenzidine is used in the production of azo dyes and is considered a carcinogen. It contains two benzene rings. This compound has been shown to increase the incidence of tumors in animals. Because it is structurally similar to benzidine, a known carcinogen, it is believed that it may... |
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| 111-44-4 | Dichloroethyl ether (Bis(2-chloroethyl)ether) | |
| 542-75-6 | 1,3-Dichloropropene 1,3-Dichloropropene 1,3-Dichloropropene, also known as Telone or simply 1,3-D, is a colorless liquid with a sweet smell. It exists as a mixture of the geometric isomers cis-1,3-dichloropropene and trans-1,3-dichloropropene. It dissolves in water and evaporates easily. It is used mainly in farming as a pesticide,... |
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| 62-73-7 | Dichlorvos Dichlorvos Dichlorvos or 2,2-dichlorovinyl dimethyl phosphate is a highly volatile organophosphate, widely used as a insecticide to control household pests, in public health, and protecting stored product from insects. It is effective against mushroom flies, aphids, spider mites, caterpillars, thrips, and... |
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| 111-42-2 | Diethanolamine | |
| 64-67-5 | Diethyl sulfate Diethyl sulfate Diethyl sulfate is a highly toxic and likely carcinogenicchemical compound with formula 24. It occurs as a colorless liquid with a peppermint odor.Diethyl sulfate is used as an alkylating agent to prepare ethyl derivatives of phenols, amines, and thiols.... |
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| 119-90-4 | 3,3'-Dimethoxybenzidine | |
| 60-11-7 | Dimethyl aminoazobenzene Methyl yellow Methyl yellow, or C.I. 11020, is a chemical compound which may be used as a pH indicator.In aqueous solution at low pH, methyl yellow appears red... |
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| 119-93-7 | 3,3'-Dimethyl benzidine | |
| 79-44-7 | Dimethyl carbamoyl chloride | |
| 68-12-2 | Dimethyl formamide Dimethylformamide Dimethylformamide is an organic compound with the formula 2NCH. Commonly abbreviated as DMF , this colourless liquid is miscible with water and the majority of organic liquids. DMF is a common solvent for chemical reactions... |
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| 57-14-7 | 1,1-Dimethyl hydrazine | |
| 131-11-3 | Dimethyl phthalate Dimethyl phthalate Dimethyl phthalate is a phthalate with molecular formula 2. It is the methyl ester of phthalic acid.Dimethyl phthalate is an ectoparasiticide and has many other uses, including in solid rocket propellants, plastics, and insect repellents.... |
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| 77-78-1 | Dimethyl sulfate Dimethyl sulfate Dimethyl sulfate is a chemical compound with formula 2SO2. As the diester of methanol and sulfuric acid, its formula is often written as 2SO4 or even Me2SO4, where CH3 or Me is methyl... |
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| 121-69-7 | N,N-Dimethylaniline Dimethylaniline N,N-Dimethylaniline is an organic chemical compound, a substituted derivative of aniline. It consists of a tertiary amine, featuring dimethylamino group attached to a phenyl group. This oily liquid is colourless when pure, but commercial samples are often yellow... |
Clean Air Act erroneously lists N,N-Diethylaniline |
| 534-52-1 | 4,6-Dinitro-o-cresol, and salts | |
| 51-28-5 | 2,4-Dinitrophenol 2,4-Dinitrophenol 2,4-Dinitrophenol , C6H4N2O5, is a cellular metabolic poison. It uncouples oxidative phosphorylation by carrying protons across the mitochondrial membrane, leading to a rapid consumption of energy without generation of ATP.... |
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| 121-14-2 | 2,4-Dinitrotoluene Dinitrotoluene 2,4-Dinitrotoluene or Dinitro is an organic compound with the formula C6H32. This pale yellow crystalline solid is well known as a precursor to trinitrotoluene but is mainly used in the polymer industry.... |
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| 123-91-1 | 1,4-Dioxane 1,4-Dioxane 1,4-Dioxane, often called dioxane because the other isomers of dioxane are rare, is a heterocyclic organic compound. It is a colorless liquid with a faint sweet odor similar to that of diethyl ether. It is classified as an ether. This colorless liquid is mainly used as a stabilizer for the solvent... (1,4-Diethyleneoxide) |
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| 122-66-7 | 1,2-Diphenylhydrazine | |
| 106-89-8 | Epichlorohydrin Epichlorohydrin Epichlorohydrin is an organochlorine compound and an epoxide. This is a colorless liquid with a pungent, garlic-like odor, moderately soluble in water, but miscible with most polar organic solvents. Epichlorohydrin is a highly reactive compound and is used in the production of glycerol, plastics,... (l-Chloro-2,3-epoxypropane) |
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| 106-88-7 | 1,2-Epoxybutane | |
| 140-88-5 | Ethyl acrylate Ethyl acrylate Ethyl acrylate is an organic compound primarily used in the preparation of various polymers. It is a clear liquid with an acrid penetrating odor. The human nose is capable of detecting this odor at a thousand times lower concentration than is considered harmful if continuously exposed for some... |
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| 100-41-4 | Ethyl benzene Ethylbenzene Ethylbenzene is an organic compound with the formula C6H5CH2CH3. This aromatic hydrocarbon is important in the petrochemical industry as an intermediate in the production of styrene, which in turn is used for making polystyrene, a common plastic material.... |
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| 51-79-6 | Ethyl carbamate Ethyl carbamate Ethyl carbamate is a chemical compound with the molecular formula C3H7NO2 first prepared in the nineteenth century. Structurally, it is an ester of carbamic acid... (Urethane) |
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| 75-00-3 | Ethyl chloride Chloroethane Chloroethane or monochloroethane, commonly known by its old name ethyl chloride, is a chemical compound with chemical formula , once widely used in producing tetraethyllead, a gasoline additive... (Chloroethane) |
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| 106-93-4 | Ethylene dibromide 1,2-Dibromoethane 1,2-Dibromoethane, also known as ethylene dibromide , is the chemical compound with the formula BrCH2CH2Br. Although trace amounts occur naturally in the ocean, where it is formed probably by algae and kelp, it is mainly a synthetic... (1,2-Dibromoethane) |
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| 107-06-2 | Ethylene dichloride 1,2-Dichloroethane The chemical compound 1,2-dichloroethane, commonly known by its old name of ethylene dichloride , is a chlorinated hydrocarbon, mainly used to produce vinyl chloride monomer , the major precursor for PVC production. It is a colourless liquid with a chloroform-like odour... (1,2-Dichloroethane) |
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| 107-21-1 | Ethylene glycol Ethylene glycol Ethylene glycol is an organic compound widely used as an automotive antifreeze and a precursor to polymers. In its pure form, it is an odorless, colorless, syrupy, sweet-tasting liquid... |
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| 151-56-4 | Ethylene imine Aziridine Aziridines are organic compounds containing the aziridine functional group, a three-membered heterocycle with one amine group and two methylene groups... (Aziridine) |
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| 75-21-8 | Ethylene oxide Ethylene oxide Ethylene oxide, also called oxirane, is the organic compound with the formula . It is a cyclic ether. This means that it is composed of two alkyl groups attached to an oxygen atom in a cyclic shape . This colorless flammable gas with a faintly sweet odor is the simplest epoxide, a three-membered... |
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| 96-45-7 | Ethylene thiourea | |
| 75-34-3 | Ethylidene dichloride 1,1-Dichloroethane 1,1-Dichloroethane is a chlorinated hydrocarbon. It is a colorless oily liquid with a chloroform-like odor. It is not easily soluble in water, but miscible with most organic solvents.... (1,1-Dichloroethane) |
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| 50-00-0 | Formaldehyde Formaldehyde Formaldehyde is an organic compound with the formula CH2O. It is the simplest aldehyde, hence its systematic name methanal.Formaldehyde is a colorless gas with a characteristic pungent odor. It is an important precursor to many other chemical compounds, especially for polymers... |
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| 76-44-8 | Heptachlor Heptachlor Heptachlor is an organochlorine compound that was used as an insecticide. Usually sold as a white or tan powder, heptachlor is one of the cyclodiene insecticides. In 1962, Rachel Carson's Silent Spring questioned the safety of heptachlor and other chlorinated insecticides. Due to its highly... |
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| 118-74-1 | Hexachlorobenzene Hexachlorobenzene Hexachlorobenzene, or perchlorobenzene, is a chlorocarbon with the molecular formula C6Cl6. It is a fungicide formerly used as a seed treatment, especially on wheat to control the fungal disease bunt... |
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| 87-68-3 | Hexachlorobutadiene Hexachlorobutadiene Hexachlorobutadiene, Cl2C=CC=CCl2, is a colorless liquid at room temperature that has an odor similar to that of turpentine. It is a chlorinated aliphatic diene with niche applications but is most commonly used as a solvent for other chlorine-containing compounds.-Synthesis:Hexachlorobutadiene, or... |
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| 77-47-4 | Hexachlorocyclopentadiene Hexachlorocyclopentadiene Hexachlorocyclopentadiene is an organochlorine compound that is a precursor to several pesticides. This colourless liquid is an inexpensive reactive diene. Many of its derivatives proved to be highly controversial, as studies showed them to be persistent organic pollutants. Collectively, the... |
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| 67-72-1 | Hexachloroethane Hexachloroethane Hexachloroethane, also known as perchloroethanes , C2Cl6, is a colorless solid at room temperature which is used by the US Military in smoke compositions, e.g... |
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| 822-06-0 | Hexamethylene-1,6-diisocyanate Hexamethylene diisocyanate Hexamethylene diisocyanate is an organic compound in the class known as isocyanates. More specifically, it is an aliphatic diisocyanate. It is produced in relatively small quantities, accounting for only 3.4% of the global diisocyanate market in the year 2000... |
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| 680-31-9 | Hexamethylphosphoramide Hexamethylphosphoramide Hexamethylphosphoramide, often abbreviated HMPA, is a phosphoramide having the formula [2N]3PO. This colorless liquid is a useful polar aprotic solvent and additive in organic synthesis.-Structure and reactivity:... |
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| 110-54-3 | Hexane Hexane Hexane is a hydrocarbon with the chemical formula C6H14; that is, an alkane with six carbon atoms.The term may refer to any of four other structural isomers with that formula, or to a mixture of them. In the IUPAC nomenclature, however, hexane is the unbranched isomer ; the other four structures... |
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| 302-01-2 | Hydrazine Hydrazine Hydrazine is an inorganic compound with the formula N2H4. It is a colourless flammable liquid with an ammonia-like odor. Hydrazine is highly toxic and dangerously unstable unless handled in solution. Approximately 260,000 tons are manufactured annually... |
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| 7647-01-0 | Hydrochloric acid Hydrogen chloride The compound hydrogen chloride has the formula HCl. At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric humidity. Hydrogen chloride gas and hydrochloric acid are important in technology and industry... |
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| 7664-39-3 | Hydrogen fluoride Hydrogen fluoride Hydrogen fluoride is a chemical compound with the formula HF. This colorless gas is the principal industrial source of fluorine, often in the aqueous form as hydrofluoric acid, and thus is the precursor to many important compounds including pharmaceuticals and polymers . HF is widely used in the... (Hydrofluoric acid) |
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| 7783-06-4 | Hydrogen sulfide Hydrogen sulfide Hydrogen sulfide is the chemical compound with the formula . It is a colorless, very poisonous, flammable gas with the characteristic foul odor of expired eggs perceptible at concentrations as low as 0.00047 parts per million... |
delisted on December 4, 1991 |
| 123-31-9 | Hydroquinone Hydroquinone Hydroquinone, also benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, having the chemical formula C6H42. Its chemical structure, shown in the table at right, has two hydroxyl groups bonded to a benzene ring in a para position. It is a white granular solid... |
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| 78-59-1 | Isophorone Isophorone Isophorone is an α,β-Unsaturated cyclic ketone, a colorless to yellowish liquid with characteristic smell, that is used as a solvent and as an intermediate in organic synthesis... |
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| 58-89-9 | Lindane Lindane Lindane, also known as gamma-hexachlorocyclohexane, , gammaxene, Gammallin and erroneously known as benzene hexachloride , is an organochlorine chemical variant of hexachlorocyclohexane that has been used both as an agricultural insecticide and as a pharmaceutical treatment for lice and... (all isomers) |
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| 108-31-6 | Maleic anhydride Maleic anhydride Maleic anhydride is an organic compound with the formula C2H22O. It is the acid anhydride of maleic acid and in its pure state it is a colourless or white solid with an acrid odour.... |
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| 67-56-1 | Methanol Methanol Methanol, also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits, is a chemical with the formula CH3OH . It is the simplest alcohol, and is a light, volatile, colorless, flammable liquid with a distinctive odor very similar to, but slightly sweeter than, ethanol... |
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| 72-43-5 | Methoxychlor Methoxychlor Methoxychlor is a synthetic organochlorine used as an insecticide.-Usage:Methoxychlor is used to protect crops, ornamentals, livestock, and pets against fleas, mosquitoes, cockroaches, and other insects... |
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| 74-83-9 | Methyl bromide (Bromomethane) | |
| 74-87-3 | Methyl chloride Chloromethane Chloromethane, also called methyl chloride, R-40 or HCC 40, is a chemical compound of the group of organic compounds called haloalkanes. It was once widely used as a refrigerant. It is a colorless extremely flammable gas with a minorly sweet odor, which is, however, detected at possibly toxic levels... (Chloromethane) |
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| 71-55-6 | Methyl chloroform 1,1,1-Trichloroethane The organic compound 1,1,1-trichloroethane, also known as methyl chloroform, is a chloroalkane. This colourless, sweet-smelling liquid was once produced industrially in large quantities for use as a solvent... (1,1,1-Trichloroethane) |
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| 78-93-3 | Methyl ethyl ketone Butanone Butanone, also known as methyl ethyl ketone or MEK, is an organic compound with the formula CH3CCH2CH3. This colorless liquid ketone has a sharp, sweet odor reminiscent of butterscotch and acetone. It is produced industrially on a large scale, and also occurs in trace amounts in nature... (2-Butanone or MEK) |
delisted on December 19, 2005 |
| 60-34-4 | Methyl hydrazine Monomethylhydrazine Monomethylhydrazine is a volatile hydrazine chemical with the chemical formula CH3 NH2. It is used as a rocket propellant in bipropellant rocket engines because it is hypergolic with various oxidizers such as nitrogen tetroxide and nitric acid... |
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| 74-88-4 | Methyl iodide Iodomethane Methyl iodide, also called iodomethane, and commonly abbreviated "MeI", is the chemical compound with the formula CH3I. It is a dense, colorless, volatile liquid. In terms of chemical structure, it is related to methane by replacement of one hydrogen atom by an atom of iodine. It is naturally... (Iodomethane) |
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| 108-10-1 | Methyl isobutyl ketone Methyl isobutyl ketone Methyl isobutyl ketone is the organic compound with the formula 2CHCH2CCH3. This colourless liquid, a ketone, is widely used as a solvent.-Production:... (Hexone or MIBK) |
currently under review for delisting |
| 624-83-9 | Methyl isocyanate Methyl isocyanate Methyl isocyanate is an organic compound with the molecular formula CH3NCO. Synonyms are isocyanatomethane, methyl carbylamine, and MIC. Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides . It has also been used in the production of rubbers and adhesives... |
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| 80-62-6 | Methyl methacrylate Methyl methacrylate Methyl methacrylate is an organic compound with the formula CH2=CCOOCH3. This colourless liquid, the methyl ester of methacrylic acid is a monomer produced on a large scale for the production of poly .-Production:... |
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| 1634-04-4 | Methyl tert-butyl ether Methyl tert-butyl ether Methyl tert-butyl ether, also known as methyl tertiary butyl ether and MTBE, is an organic compound with molecular formula 3COCH3. MTBE is a volatile, flammable, and colorless liquid that is immiscible with water. It has a minty odor vaguely reminiscent of diethyl ether, leading to unpleasant taste... |
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| 101-14-4 | 4,4'-Methylene bis(2-chloroaniline) | |
| 75-09-2 | Methylene chloride Dichloromethane Dichloromethane is an organic compound with the formula CH2Cl2. This colorless, volatile liquid with a moderately sweet aroma is widely used as a solvent. Although it is not miscible with water, it is miscible with many organic solvents... (Dichloromethane) |
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| 101-68-8 | Methylene diphenyl diisocyanate Methylene diphenyl diisocyanate Methylene diphenyl diisocyanate, most often abbreviated as MDI, is an aromatic diisocyanate. It exists in three isomers, 2,2'-MDI, 2,4'-MDI, and 4,4'-MDI, but the 4,4' isomer is most widely used. This isomer is also known as Pure MDI. MDI reacts with polyols in the manufacture of polyurethane... (MDI) |
currently under review for delisting |
| 101-77-9 | 4,4'-Methylenedianiline 4,4'-Methylenedianiline 4,4'-Methylenedianiline is a suspected carcinogen.It is included in the "substances of very high concern" list of the European Chemicals Agency... |
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| 91-20-3 | Naphthalene Naphthalene Naphthalene is an organic compound with formula . It is a white crystalline solid with a characteristic odor that is detectable at concentrations as low as 0.08 ppm by mass. As an aromatic hydrocarbon, naphthalene's structure consists of a fused pair of benzene rings... |
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| 98-95-3 | Nitrobenzene Nitrobenzene Nitrobenzene is an organic compound with the chemical formula C6H5NO2. It is a water-insoluble pale yellow oil with an almond-like odor. It freezes to give greenish-yellow crystals. It is produced on a large scale as a precursor to aniline. Although occasionally used as a flavoring or perfume... |
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| 92-93-3 | 4-Nitrobiphenyl | |
| 100-02-7 | 4-Nitrophenol 4-Nitrophenol 4-Nitrophenol is a phenolic compound that has a nitro group at the opposite position of hydroxy group on the benzene ring.-Properties:... |
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| 79-46-9 | 2-Nitropropane | |
| 684-93-5 | N-Nitroso-N-methylurea N-Nitroso-N-methylurea N-Nitroso-N-methylurea is a highly reliable carcinogen, mutagen, and teratogen. NMU is an alkylating agent, and exhibits its toxicity by transferring its methyl group to nucleobases in nucleic acids.... |
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| 62-75-9 | N-Nitrosodimethylamine N-Nitrosodimethylamine N-Nitrosodimethylamine , also known as dimethylnitrosamine , is a semi-volatile organic chemical that is highly toxic and is a suspected human carcinogen. The US Environmental Protection Agency has determined that the maximum admissible concentration of NDMA in drinking water is 7 ng L−1... |
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| 59-89-2 | N-Nitrosomorpholine | |
| 56-38-2 | Parathion Parathion Parathion, also called parathion-ethyl or diethyl parathion, is an organophosphate compound. It is a potent insecticide and acaricide. It was originally developed by IG Farben in the 1940s. It is highly toxic to non-target organisms, including humans. Its use is banned or restricted in many... |
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| 82-68-8 | Pentachloronitrobenzene Pentachloronitrobenzene Pentachloronitrobenzene, typically abbreviated PCNB, is a registered fungicide formally derived from nitrobenzene. It is either an off-white or yellow solid, depending on its purity, with a musty odor.-Preparation:... (Quintobenzene) |
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| 87-86-5 | Pentachlorophenol Pentachlorophenol Pentachlorophenol is an organochlorine compound used as a pesticide and a disinfectant. First produced in the 1930s, it is marketed under many trade names... |
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| 108-95-2 | Phenol Phenol Phenol, also known as carbolic acid, phenic acid, is an organic compound with the chemical formula C6H5OH. It is a white crystalline solid. The molecule consists of a phenyl , bonded to a hydroxyl group. It is produced on a large scale as a precursor to many materials and useful compounds... |
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| 106-50-3 | p-Phenylenediamine P-Phenylenediamine p-Phenylenediamine is an organic compound with the formula C6H42. This derivative of aniline is a colorless solid, but typically samples can contain yellowish impurities arising from oxidation. It is mainly used as a component of engineering polymers and composites. It is also an ingredient in... |
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| 75-44-5 | Phosgene Phosgene Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles... |
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| 7803-51-2 | Phosphine Phosphine Phosphine is the compound with the chemical formula PH3. It is a colorless, flammable, toxic gas. Pure phosphine is odourless, but technical grade samples have a highly unpleasant odor like garlic or rotting fish, due to the presence of substituted phosphine and diphosphine... |
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| 7723-14-0 | Phosphorus Phosphorus Phosphorus is the chemical element that has the symbol P and atomic number 15. A multivalent nonmetal of the nitrogen group, phosphorus as a mineral is almost always present in its maximally oxidized state, as inorganic phosphate rocks... |
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| 85-44-9 | Phthalic anhydride Phthalic anhydride Phthalic anhydride is the organic compound with the formula C6H42O. It is the anhydride of phthalic acid. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. In 2002, approximately 4.6 billion kilograms were... |
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| 1336-36-3 | Polychlorinated biphenyls (Aroclors) | |
| 1120-71-4 | 1,3-Propane sultone | |
| 57-57-8 | beta-Propiolactone | |
| 123-38-6 | Propionaldehyde Propionaldehyde Propionaldehyde or propanal is the organic compound with the formula CH3CH2CHO. It is a saturated 3-carbon aldehyde and is a structural isomer of acetone... |
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| 114-26-1 | Propoxur Propoxur Propoxur is a carbamate insecticide and was introduced in 1959. Propoxur is a non-systemic insecticide with a fast knockdown and long residual effect used against turf, forestry, and household pests and fleas. It is also used in pest control for other domestic animals, Anopheles mosquitoes, ants,... (Baygon) |
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| 78-87-5 | Propylene dichloride 1,2-Dichloropropane 1,2-Dichloropropane is an organic compound classified as a chlorocarbon. It is a colorless, flammable liquid with a chloroform-like odor.1,2-Dichloropropane is used as a chemical intermediate in the production of perchloroethylene and other chlorinated chemicals.In the past, 1,2-dichloropropane... (1,2-Dichloropropane) |
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| 75-56-9 | Propylene oxide Propylene oxide Propylene oxide is an organic compound with the molecular formula CH3CHCH2O. This colourless volatile liquid is produced on a large scale industrially, its major application being its use for the production of polyether polyols for use in making polyurethane plastics... |
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| 75-55-8 | 1,2-Propylenimine (2-Methyl aziridine) | |
| 91-22-5 | Quinoline Quinoline Quinoline is a heterocyclic aromatic organic compound. It has the formula C9H7N and is a colourless hygroscopic liquid with a strong odour. Aged samples, if exposed to light, become yellow and later brown... |
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| 106-51-4 | Quinone 1,4-Benzoquinone 1,4-Benzoquinone, commonly known as para-quinone, is a chemical compound with the formula C6H4O2. In a pure state, it forms bright-yellow crystals with a characteristic irritating odor, resembling that of chlorine, bleach, and hot plastic. Impure samples are often dark-colored due to the presence... |
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| 100-42-5 | Styrene | |
| 96-09-3 | Styrene oxide Styrene oxide Styrene oxide is an epoxide derived from styrene. It may be prepared by epoxidation of styrene with peroxybenzoic acid, in the Prilezhaev reaction:- Toxicology :... |
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| 1746-01-6 | 2,3,7,8-Tetrachlorodibenzo-p-dioxin | |
| 79-34-5 | 1,1,2,2-Tetrachloroethane 1,1,2,2-Tetrachloroethane 1,1,2,2-Tetrachloroethane is a chlorinated derivative of ethane. It has the highest solvent power of any chlorinated hydrocarbon. As a refrigerant, it is used under the name R-130.... |
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| 127-18-4 | Tetrachloroethylene Tetrachloroethylene Tetrachloroethylene, also known under its systematic name tetrachloroethene and many other names, is a chlorocarbon with the formula Cl2C=CCl2. It is a colourless liquid widely used for dry cleaning of fabrics, hence it is sometimes called "dry-cleaning fluid." It has a sweet odor detectable by... (Perchloroethylene) |
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| 7550-45-0 | Titanium tetrachloride Titanium tetrachloride Titanium tetrachloride is the inorganic compound with the formula TiCl4. It is an important intermediate in the production of titanium metal and the pigment titanium dioxide. TiCl4 is an unusual example of a metal halide that is highly volatile... |
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| 108-88-3 | Toluene Toluene Toluene, formerly known as toluol, is a clear, water-insoluble liquid with the typical smell of paint thinners. It is a mono-substituted benzene derivative, i.e., one in which a single hydrogen atom from the benzene molecule has been replaced by a univalent group, in this case CH3.It is an aromatic... |
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| 95-80-7 | 2,4-Toluene diamine | |
| 584-84-9 | 2,4-Toluene diisocyanate Toluene diisocyanate Toluene diisocyanate is an aromatic diisocyanate. It is produced for reaction with polyols to form polyurethanes. It exists in two isomers, 2,4-TDI and 2,6-TDI . 2,4-TDI is produced in the pure state, but TDI is often marketed as 80/20 and 65/35 mixtures of the 2,4 and 2,6 isomers respectively... |
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| 95-53-4 | o-Toluidine Toluidine There are three isomers of toluidine, which are organic compounds. These isomers are o-toluidine, m-toluidine, and p-toluidine. The o- stands for ortho- , m- stands for meta- , and p- stands for para-... |
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| 8001-35-2 | Toxaphene Toxaphene Toxaphene is an insecticide. It is a mixture of closely related substances whose use is now banned in most of the world due to concerns of toxicity.-Composition:... (chlorinated camphene) |
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| 120-82-1 | 1,2,4-Trichlorobenzene 1,2,4-Trichlorobenzene 1,2,4-Trichlorobenzene is an organic compound used as a solvent, and is one of the best known solvents used to dissolve fullerenes and pentacene. It is a benzene derivative with three chlorine atoms substitutents, in the 1, 2 and 4 positions of the benzene ring.-See... |
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| 79-00-5 | 1,1,2-Trichloroethane 1,1,2-Trichloroethane 1,1,2-Trichloroethane, or 1,1,2-TCA, is an organochloride solvent with the molecular formula C2H3Cl3. It is a colourless, sweet-smelling liquid that does not dissolve in water, but is soluble in most organic solvents... |
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| 79-01-6 | Trichloroethylene Trichloroethylene The chemical compound trichloroethylene is a chlorinated hydrocarbon commonly used as an industrial solvent. It is a clear non-flammable liquid with a sweet smell. It should not be confused with the similar 1,1,1-trichloroethane, which is commonly known as chlorothene.The IUPAC name is... |
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| 95-95-4 | 2,4,5-Trichlorophenol | |
| 88-06-2 | 2,4,6-Trichlorophenol | |
| 121-44-8 | Triethylamine Triethylamine Triethylamine is the chemical compound with the formula N3, commonly abbreviated Et3N. It is also abbreviated TEA, yet this abbreviation must be used carefully to avoid confusion with triethanolamine, for which TEA is also a common abbreviation.... |
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| 1582-09-8 | Trifluralin Trifluralin Trifluralin is a commonly used pre-emergence herbicide. With about 14 million pounds used in the United States in 2001, it is one of the most widely used herbicides. Trifluralin is generally applied to the soil to provide control of a variety of annual grass and broadleaf weed species... |
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| 540-84-1 | 2,2,4-Trimethylpentane 2,2,4-Trimethylpentane 2,2,4-Trimethylpentane, also known as isooctane, iso-octane, is an organic compound with the formula 3CCH2CH2. It is one of several isomers of octane . This particular isomer is the standard for 100 point on the octane rating scale... |
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| 108-05-4 | Vinyl acetate Vinyl acetate Vinyl acetate is an organic compound with the formula CH3COOCH=CH2. A colorless liquid with a pungent odor, it is the precursor to polyvinyl acetate, an important polymer in industry.-Production:... |
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| 593-60-2 | Vinyl bromide Vinyl bromide Vinyl bromide is a simple vinyl halide. It is soluble in chloroform, ethanol, diethyl ether, acetone and benzene.- Uses :Vinyl bromide is used to manufacture bromopolymers and mainly polyvinyl bromide... (Bromoethene) |
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| 75-01-4 | Vinyl chloride Vinyl chloride Vinyl chloride is the organochloride with the formula H2C:CHCl. It is also called vinyl chloride monomer, VCM or chloroethene. This colorless compound is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride . At ambient pressure and temperature, vinyl chloride... (Chloroethene) |
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| 75-35-4 | Vinylidene chloride (1,1-Dichloroethylene) | |
| 1330-20-7 | Xylene Xylene Xylene encompasses three isomers of dimethylbenzene. The isomers are distinguished by the designations ortho- , meta- , and para- , which specify to which carbon atoms the two methyl groups are attached... s (isomers and mixture) |
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| 95-47-6 | o-Xylenes Xylene Xylene encompasses three isomers of dimethylbenzene. The isomers are distinguished by the designations ortho- , meta- , and para- , which specify to which carbon atoms the two methyl groups are attached... |
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| 108-38-3 | m-Xylenes Xylene Xylene encompasses three isomers of dimethylbenzene. The isomers are distinguished by the designations ortho- , meta- , and para- , which specify to which carbon atoms the two methyl groups are attached... |
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| 106-42-3 | p-Xylenes Xylene Xylene encompasses three isomers of dimethylbenzene. The isomers are distinguished by the designations ortho- , meta- , and para- , which specify to which carbon atoms the two methyl groups are attached... |
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| n/a | Antimony Antimony Antimony is a toxic chemical element with the symbol Sb and an atomic number of 51. A lustrous grey metalloid, it is found in nature mainly as the sulfide mineral stibnite... Compounds |
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| n/a | Arsenic Arsenic Arsenic is a chemical element with the symbol As, atomic number 33 and relative atomic mass 74.92. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. It was first documented by Albertus Magnus in 1250.Arsenic is a metalloid... Compounds |
inorganic including arsine Arsine Arsine is the chemical compound with the formula AsH3. This flammable, pyrophoric, and highly toxic gas is one of the simplest compounds of arsenic... |
| n/a | Beryllium Beryllium Beryllium is the chemical element with the symbol Be and atomic number 4. It is a divalent element which occurs naturally only in combination with other elements in minerals. Notable gemstones which contain beryllium include beryl and chrysoberyl... Compounds |
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| n/a | Cadmium Cadmium Cadmium is a chemical element with the symbol Cd and atomic number 48. This soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Similar to zinc, it prefers oxidation state +2 in most of its compounds and similar to mercury it shows a low... Compounds |
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| n/a | Chromium Chromium Chromium is a chemical element which has the symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odorless, tasteless, and malleable... Compounds |
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| n/a | Cobalt Cobalt Cobalt is a chemical element with symbol Co and atomic number 27. It is found naturally only in chemically combined form. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.... Compounds |
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| n/a | Coke Oven Emissions | |
| n/a | Cyanide Compounds | |
| n/a | Glycol ethers Glycol Ethers Glycol ethers are a group of solvents based on alkyl ethers of ethylene glycol commonly used in paints. These solvents typically have higher boiling point, together with the favorable solvent properties of lower molecular weight of ethers and alcohols. The word "Cellosolve" was registered in 1924... |
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| n/a | Lead Lead Lead is a main-group element in the carbon group with the symbol Pb and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed... Compounds |
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| n/a | Manganese Manganese Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature , and in many minerals... Compounds |
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| n/a | Mercury Mercury (element) Mercury is a chemical element with the symbol Hg and atomic number 80. It is also known as quicksilver or hydrargyrum... Compounds |
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| n/a | Fine mineral fibers | |
| n/a | Nickel Nickel Nickel is a chemical element with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile... Compounds |
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| n/a | Polycylic Organic Matter | |
| n/a | Radionuclides | including radon Radon Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as the decay product of uranium or thorium. Its most stable isotope, 222Rn, has a half-life of 3.8 days... |
| n/a | Selenium Selenium Selenium is a chemical element with atomic number 34, chemical symbol Se, and an atomic mass of 78.96. It is a nonmetal, whose properties are intermediate between those of adjacent chalcogen elements sulfur and tellurium... Compounds |
For all listings above which contain the word "compounds" and for glycol ethers, the following applies: Unless otherwise specified, these listings are defined as including any unique chemical substance that contains the named chemical (i.e., antimony, arsenic, etc.) as part of that chemical's infrastructure.
X'CN where X = H' or any other group where a formal dissociation may occur. For example KCN or Ca(CN)2 Includes mono- and di- ethers of ethylene glycol
Ethylene glycol
Ethylene glycol is an organic compound widely used as an automotive antifreeze and a precursor to polymers. In its pure form, it is an odorless, colorless, syrupy, sweet-tasting liquid...
, diethylene glycol
Diethylene glycol
Diethylene glycol is an organic compound with the formula 2O. It is a colorless, practically odorless, poisonous, and hygroscopic liquid with a sweetish taste. It is miscible in water, alcohol, ether, acetone, and ethylene glycol. DEG is a widely used solvent...
, and triethylene glycol
Triethylene glycol
Triethylene glycol, TEG, or triglycol is a colorless odorless viscous liquid with molecular formula HOCH2CH2OCH2CH2OCH2CH2OH. It is used as a plasticizer for vinyl. It is also used in air sanitizer products, such as "Oust" or "Clean and Pure." When aerosolized it acts as a disinfectant...
R-(OCH2CH2)n -OR' where
- n = 1, 2, or 3
- R = alkyl C7 (chain of 7 carbon atoms) or less; or phenyl or alkyl substituted phenyl
- R' = H or alkyl C7 or less; or OR' consisting of carboxylic acid ester, sulfate, phosphate, nitrate, or sulfonate. Polymers are excluded from the glycol category, as well as surfactant alcohol ethoxylates (where R is an alkyl C8 or greater) and their derivatives, and ethylene glycol monobutyl ether (CAS 111-76-2). Includes mineral fiber emissions from facilities manufacturing or processing glass, rock, or slag fibers (or other mineral derived fibers) of average diameter 1 micrometer or less. Includes organic compounds with more than one benzene ring, and which have a boiling point greater than or equal to 100 °C. A type of atom which spontaneously undergoes radioactive decay.
Sources: USEPA's original list & Modifications
Pollution sources
Most air toxics originate from human-made sources, including mobile sources (e.g., cars, trucks, buses) and stationary sources (e.g., factories, refineries, power plants), as well as indoor sources (e.g., building materials and activities such as cleaning). There are two types of stationary sources that generate routine emissions of air toxics:"Major" sources
Major stationary source
A major stationary source is a source that emits more than a certain amount of a pollutant as defined by the U.S. Environmental Protection Agency...
are defined as sources that emit 10 tons per year of any of the listed toxic air pollutants, or 25 tons per year of a mixture of air toxics. These sources may release air toxics from equipment leaks, when materials are transferred from one location to another, or during discharge through emission stacks or vents
"Area" sources consist of smaller-size facilities that release lesser quantities of toxic pollutants into the air. Area sources are defined as sources that emit less than 10 tons per year of a single air toxic, or less than 25 tons per year of a combination of air toxics. Though emissions from individual area sources are often relatively small, collectively their emissions can be of concern - particularly where large numbers of sources are located in heavily populated areas.
The United States EPA published the initial list of "source categories" in 1992 (57FR
Federal Register
The Federal Register , abbreviated FR, or sometimes Fed. Reg.) is the official journal of the federal government of the United States that contains most routine publications and public notices of government agencies...
31576, July 16, 1992) and since that time has issued several revisions and updates to the list and promulgation schedule. For each listed source category, EPA indicates whether the sources are considered to be "major" sources or "area" sources. The 1990 Clean Air Act Amendments direct EPA to set standards for all major sources of air toxics (and some area sources that are of particular concern).
http://www.epa.gov/ttn/atw/pollsour.html
External links
- Overview, a brief description of the sections of the Clean Air Act related to air toxics as well as further links to relevant rules, reports, and programs.
Specific MACT regulation summaries: