Compressed natural gas (CNG ) cars are much more environmentally friendly than gas-powered cars, as they can reduce carbon emissions by 10% to 20% (or more).

1. Fiat Palio - India
2. Renault Logan - India
3. Hyundai Santro Xing CNG - India
4. Mitsubishi Lancer - India
5. Lifan 520 Sedan - China
6. Volkswagen Passat - Europe
7. Opel Zafiria - Europe
8. Mercedes-Benz B 170 NGT Blue Efficiency - Europe
9. Ford Focus NGV -Italy, Germany, Austria, the Netherlands and Sweden
10. Honda Civic GX -US (California and New York only), England, Japan, Canada, Pakistan and Brazil

[ The World’s Cleanest Cars ]