The emission of pollution by the industries however is by far the most extensive and harmful for humans as well as the environment. More specifically manufacturing industries making use of chemicals, and fossil fuels, or hydrocarbon fuel based combustion tend to emit large amounts of harmful pollutant compounds into the air. “One type of air pollution is the release of particles into the air from burning fuel for energy. Diesel smoke is a good example of this particulate matter.
The particles are very small pieces of matter measuring about 2.5 microns or about .0001 inches. This type of pollution is sometimes referred to as “black carbon” pollution. The exhaust from burning fuels in automobiles, homes, and industries is a major source of pollution in the air. Some authorities believe that even the burning of wood and charcoal in fireplaces and barbeques can release significant quantities of soot into the air. Another type of pollution is the release of noxious gases, such as sulfur dioxide, carbon monoxide, nitrogen oxides, and chemical vapors. These can take part in further chemical reactions once they are in the atmosphere, forming smog and acid rain” (‘Indoor and Outdoor Air Pollution’)