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Liquid Petroleum Gas is a mixture of short hydrocarbons with most of
the volume being propane and butane. LPG is considered an alternative fuel that
burns cleaner than gasoline because of the very short hydrocarbon chains that
tend to not produce a high volume of CO2, NOx radicals. LPG is now
being found in the air in the unburned state most likely from leaking pipes and
tanks, in this physical state LPG is now being seen a contributor to urban air
pollution.
[http://www.transportation.anl.gov/ttrdc/publications/papers/cleancities/index.html]
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