Compressed Natural Gas (CNG) or Liquefied Petroleum Gas (LPG) Taxis
A number of cities have introduced taxis that run on Compressed Natural Gas (CNG) or Liquefied Petroleum Gas (LPG) instead of conventional petrol or diesel, as they reduce air pollution and noise. However, the CO2 benefits vary and emissions may be even higher than an efficient diesel powered vehicle.
Case Study: Converting Delhi's Auto-Rickshaws to CNG (India)