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

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

compulsory mixing of $\displaystyle 20 \%$ ethyl alcohol with petrol and $\displaystyle 20 \%$ biodiesel with diesel.

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

Permission to use only pure diesel with a maximum of $\displaystyle 500$ ppm sulphur as fuel for vehicles.