Advantages&disadvantages of CNG gas used in vehicals?

if any has any information about this topic,pls help me soon.i want 2 submit an assignment on this topic,so reply as soon as possible

Answer:
Assuming that CNG means Compressed Natural Gas,
Advantages:
Clean burning -- exhaust products are at worst CO, CO2 and H2O, and usually are only CO2 and H2O
Most powerful -- CH4 produces more heat per unit mass than any other hydrocarbon.
Abundance (from a consumer point of view) -- All cities of any size are served by natural gas pipelines.
Narrow range of explosive concentrations (5% to 15%) Concentrations above and below these limits will burn but not explode.

Disadvantages:
Requires high pressure tanks which present safety risks of their own as well as the explosiveness of the fuel.
Greenhouse gas production -- Complete combustion of CH4 is second only to combustion of H2 in producing greenhouse gases. (Remember that water vapor and CO2 attenuate and/or reflect nearly the same frequencies of infrared.)

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