Air pollution is mainly caused by the gases given out by burning petroleum products coal, fossil fuels etc. Vehicles emit large amount of gasous pollutants
into the air.The exhaust gases from automobiles and factories add to the air, Sulphur Dioxide, Carbon Monoxide, Nitrogen Oxide dust etc.such polluted atmosphere causes acid rain. It is now calculated that the content of CO2 in the atmosphere has increased by 25% in the last 100 years. The solution is that in automobiles use CNG, Hydrogen Fuel cells in stead of fossil fuels.