There a numerous constutuents of air pollution in urban areas. These include: Sulphur Dioxide (SO2) Emitted primarily during the combustion of fossil fuels and the processing of sulphur-containing ores. The major sources of sulphur dioxide are fossil fuel-burning power plants and vehicle emissions. Nitrogen Oxides (NOx) Oxides of nitrogen are collectively referred to as nitrogen oxides (NOx). NOx usually enters the air as a result of combustion processes which involve high temperatures, such as those produced by power plants and vehicle engines. Nitric oxide (NO) Nitric oxide is the main NOx emitted during combustion and it can be converted into nitrogen dioxide. Nitrogen dioxide (NO2) Nitrogen dioxide is a corrosive and highly oxidizing. It is the reaction of nitrogen dioxide with reactive organic substances, such as Volatile Organic Compounds (VOCs), in the presence of sunlight that produces ozone. Nitrogen dioxide is, therefore, an important part of urban haze or photochemical smog. Carbon Monoxide (CO) Carbon Monoxide (CO) is a by-product of the incomplete combustion of any fuel which contains carbon. Industrial processes contribute to CO pollution concentrations, but the principle source of CO in most urban areas is the automobile. Ozone and Photochemical Oxidants Ozone is not a pollutant directly emitted into the air - it is a secondary pollutant. Ozone and other photochemical oxidants (such as peroxyacyl nitrates and aldehydes) are formed by the action of ultra-violet (UV) light from the sun on nitrogen oxides. Its production and concentration is dependent on the presence of primary pollutants as well as ultra-violet light. In the presence of volatile organic compounds, high concentrations of ozone are formed. Respirable Suspended Particulates (RSP) RSP are the proportion of total suspended particulates with a size smaller than 10 micrometres. They have the ability to penetrate deeply into the lungs. Two important constituents of RSP are lead and aromatic hydrocarbons. [Information from Greenpeace and other sources]

maajo rair pollutant include sulphur dioxide,nitrogen oxidex cfcs Pb (from 2Toil to check knoking)