The main sources of atmospheric pollution may be summarized as follows: a) The combustion of fuels to produce energy for heating and power. This is carried out in most industrial, commercial and domestic premises. b) The exhaust emissions from transport vehicles that use petrol, or diesel oil, or kerosine fuels, including road vehicles, diesel locomotives and aeroplanes. c) Waste gases, dust and heat from many industrial sites, including chemical manufacturers, iron and steel smelting works, cement and brick works, quarries, and electrical power generating stations.