Steps taken by government of India in controlling air pollution are
A. Use of non-polluting compressed natural gas (CNG) only as fuel by all buses and trucks
B. Compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel
C. Compulsory PUC (pollution under control) certification of petrol driven vehicles which tests for carbon monoxide and hydrocarbons
D. Permission to use only pure diesel with a maximum of 500 ppm sulfur as fuel for vehicles
