How we prevent air pollution?

We can prevent air pollution by the following ways :

1. We must get our vehicles fifted with CNG or LPG kits. CNG and LPG are non-polluting fuels. Regular pollution checks of vehicles help prevent air pollution.
2. Tall chimneys with filter must be fifted in factories to release smoke and gases very high away from the populated places.
3. Encourage the use of polution free modes of transport like cycles, ricksaws and by-cycle after all cycles are very popular in advanced countries like Denmark.