Air pollutants can be divided into two broad categories: particulate matter and gases. Particulates include small solid and liquid particles such as smoke, dust, and haze. Gases include carbon monoxide and VOCs. Pollutants can also be divided into primary pollutants and secondary pollutants. Primary pollutants are emitted directly from a source, while secondary pollutants are created in the atmosphere from primary pollutants. An example of a secondary pollutant is ozone, which is harmful to plant life and to lung tissue. Ozone forms in the ambient air from primary pollutants such as VOCs in the presence of sunlight.
KeywordsEmission Factor Volumetric Flow Rate Primary Pollutant Photochemical Smog Fugitive Emission
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