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

1. A. Use of non-polluting Compressed Natural Gas (CNG) only as fuel by all buses and trucks
2. B. Compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel
3. C. Compulsory PUC (Pollution Under Control) certification of petrol driven vehicles which tests for carbon monoxide and hydrocarbons
4. D. Permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles

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