| The aerial environment of the earth has been increasingly interfered by the activities of human beings and virtually it has become the bumping site for toxic materials produced by industrial, vehicular and urban emissions. We have introduced several toxic materials to our environment at a tremendous speed that has changed its physic-chemical characteristics. The assumption that the “ nature will take care of pollutants” do not hold good anymore since the pollutants at present vary greatly in their quality as well as quantity. Throughout Asian air pollution is a significant threat to human health and the environment and our city is not the exception to this. Use of fossil fuel in transport, industrial, commercial and household sector contributes significant towards the air pollution. Solid waste disposal and its open burning also add air pollutants. In addition to gases, particles coming from variety of sources- vehicles, factories, construction sites, tilled fields, un-paved roads, stone crushers, burning of wood and fossil fuels also pollute the air. An average urban vehicle releases approximately 30-40 mg of particulate matter per mile travel. Forest fires and the contribution of biomass fuels also add pollutants. |