Question

why CNG is an excellent 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

HEY DEAR YOUR ANSWER IS HERE
CNG is a good fuel because it is based on gasoline and compressed natural gas is a clean burning fuel...It is actually the cleanest of all fossil fuels.