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Compressed natural gas, CNG, is natural gas under pressure which remains clear, odorless, and non-corrosive. CNG (methane stored at high pressure) can be used in place of gasoline (petrol), Diesel fuel and propane/LPG. CNG combustion produces fewer undesirable gases than the fuels mentioned above. It is safer than other fuels in the event of a spill, because natural gas is lighter than air and disperses quickly when released.
CNG may be found above oil deposits, or may be collected from landfills or wastewater treatment plants where it is known as biogas.. Although vehicles can use natural gas as either a liquid or a gas, most vehicles use the gaseous form compressed to pressures above 3,100 pounds per square inch.