Due to the decreased source and stock of petrol, in transport sector, the source of alter­native fuels is being developed and used as well. The characteristics of alternative fuels, their ad­vantages and disadvantages are discussed bel­low: ‘

(a) CNG (Compressed Natural Gas) is a mixer of hydrocarbon found underground in which there is 80-90% methyl gas. The highest benefit of CNG is that it produces very low pollu­tion, comparing to petrol and diesel. In Delhi CNG is being used successfully in universal transport system. However to use CNG exten­sively, mass production in transport system has not been done so far due to the shortage of re­sources.

(b) Ultra low sulphur diesel is also an al­ternative fuel, which produces even low pollu­tion comparing to CNG.

(c) Gasohol is another alternative fuel in which petrol is mixed in the alcohol obtained from sugarcane juice; using Gasohol, the increas­ing loss in petroleum in India and pollution can be checked. However a modern investigation made the remark that it is not very safe for the engine of the vehicles. Bio-diesel transport ve­hicles’ development has not taken place fully, biodiesel can be acquired from a plant called jotaropha; in future it can be proved to be very useful. Besides, motor-grade alcohol is also an important alternative fuel.