By the end of 2002 the public transport of Delhi switched over to a new fuel. Name the fuel. Why is this fuel considered better? Explain.

Explanation

Delhi Government shifted to CNG (Compressed Natural Gas). CNG is better because it burns more efficiently unlike petrol or diesel, in automobiles and very little of it is left unburnt. Also CNG is cheaper fuel than petrol and diesel and cannot be adulterated like diesel and petrol and also cannot be stolen away.