Steps taken by the Government of India to control air pollution include

(1) use of non-polluting Compressed Natural Gas (CNG) only as fuel by all buses and trucks.

(2) compulsory PUC (Pollution Under Control) certification of petrol driven vehicles which tests for carbon monoxide and hydrocarbons.

(3) compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel.

(4) permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles.