her dioxide (SO2) is a gas produced from burning coal, mainly in thermal power plants. Some industrial processes, such as production of paper and smelting of metals, produce sulpher dioxide. It is a major contributor to smog and acid rain. Sulfer dioxide can lead to lung diseases.
             Toxic Organic Micro pollutants TOMPs (Toxic Organic Micro pollutants) are produced by the incomplete combustion of fuels. They comprise a complex range of chemicals, some of which, although they are emitted in very small quantities, are highly toxic or carcinogenic. Compounds in this category include:
             • PAHs (PolyAromatic Hydrocarbons)
             • PCBs (Polychlorinated Biphenyls)
             Volatile Organic Compounds (VOCs) VOCs are released in vehicle exhaust gases e
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