What makes CNG an ideal fuel?

Natural gas can be compressed under high pressure to obtain Compressed Natural Gas(CNG).The CNG can be easily transported through pipelines.CNG in now being used as a fuel for automobiles,like cars ,busesetc.

On burning, CNG does not produce any smoke.Its products on burning are carbon dioxide and water.It leaves no ash no burning.Therefore CNG is a clean(or environment-friendly) gas