Particulate matter, or fine dust is characterized by their micrometre size PM 10 to PM 2.5. Photochemical ozone and smog are created as nitrogen oxides and hydrocarbons react to sunlight. Common gaseous pollutants include carbon monoxide, sulfur dioxide, chlorofluorocarbons (CFCs) and nitrogen oxides produced by industry and motor vehicles. Air pollution: the release of chemicals and particulates into the atmosphere.The major forms of pollution are listed below along with the particular contaminant relevant to each of them: 7.3 Socially optimal level of pollution.
