Question

which is better gas as fuel CNG or hydrogen gas and also which is less pollutant on burning

Answer 1

CNG is better fuel than the hydrogen gas because of the following reasons:

1. Combustion of both the fuel produce green house gasses but, CNG is lighter than air, and so disperses quickly when spill or released.
2. CNG is made by compressing natural gas whereas hydrogen gas must be produce therefore is energy storage medium, not an energy source.