Question

Why CNG is considered as a cleaner fuel?

Answer 1

One reason natural gas is called “clean” is because it emits 50 percent less carbon dioxide than coal when you burn it. Thus it's seen by some as a “bridge” fuel until zero-carbon-producing renewables can take over. But natural gas isn't clean in the way that solar is clean. It's clean-er than coal.

Answer 2

Cng produce almost half polluted substance as compared to coal so it is considered as cleaner fuel