Answer:
Entire fleet of public transport including autorikshaws, buses, etc. were switched over from diesel to less-polluting and more eco-friendly fuel Compressed Natural Gas (CNG).
• Bharat stage-II (Euro-II) norms were implemented in Delhi and NCR region.
• 5% Ethanol-blended petrol was launched in January 2003.
• Earlier in 1997, the Delhi Government banned the plying of those vehicles which were more than 15 years old.
• Unleaded petrol and low-sulphur diesel are being used in the automobiles.
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