• Dust emissions from the wind erosion of uncovered gravel piles, sand piles, limestone piles, coal piles, etc.
• Fugitive gaseous emissions from pipe flange
  Flange
  A flange is an external or internal ridge, or rim , for strength, as the flange of an iron beam such as an I-beam or a T-beam; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of a camera; or for a flange of a rail car or tram wheel...
  
  s, packed valve
  Valve
  A valve is a device that regulates, directs or controls the flow of a fluid by opening, closing, or partially obstructing various passageways. Valves are technically pipe fittings, but are usually discussed as a separate category...
  
   seals, gas compressor
  Gas compressor
  A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume.Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. As gases are compressible, the compressor also reduces the volume of a gas...
  
   seals, control valve
  Control valves
  Control valves are valves used to control conditions such as flow, pressure, temperature, and liquid level by fully or partially opening or closing in response to signals received from controllers that compare a "setpoint" to a "process variable" whose value is provided by sensors that monitor...
  
   seals, piping
  Piping
  Within industry, piping is a system of pipes used to convey fluids from one location to another. The engineering discipline of piping design studies the efficient transport of fluid....
  
   and vessel
  Pressure vessel
  A pressure vessel is a closed container designed to hold gases or liquids at a pressure substantially different from the ambient pressure.The pressure differential is dangerous and many fatal accidents have occurred in the history of their development and operation. Consequently, their design,...
  
   seals within industrial facilities such as oil refineries
  Oil refinery
  An oil refinery or petroleum refinery is an industrial process plant where crude oil is processed and refined into more useful petroleum products, such as gasoline, diesel fuel, asphalt base, heating oil, kerosene, and liquefied petroleum gas...
  
   and petrochemical
  Petrochemical
  Petrochemicals are chemical products derived from petroleum. Some chemical compounds made from petroleum are also obtained from other fossil fuels, such as coal or natural gas, or renewable sources such as corn or sugar cane....
  
   plants.
• Buildings, containing 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....
  
   emission sources, with no singular emission vent (i.e., buildings with multiple roof vents or multiple open windows).

See also

• Air pollution dispersion terminology
  Air pollution dispersion terminology
  Air pollution dispersion terminology includes the words and technical terms that have a special meaning to those who work in the field of air pollution dispersion modeling...
  
  
• Area source
• List of atmospheric dispersion models
• Line source
  Line source
  A line source is a source of air, noise, water contamination or electromagnetic radiation that emanates from a linear geometry...
  
  
• Point source (pollution)
  Point source (pollution)
  A point source of pollution is a single identifiable localized source of air, water, thermal, noise or light pollution. A point source has negligible extent, distinguishing it from other pollution source geometries. The sources are called point sources because in mathematical modeling, they can be...