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1Is Propane Gas Dangerous For Environment?
No! Rather, it is the cleanest fuels amongst all. According to tests conducted by the U.S. Environmental Protection Agency, it has been proved that propane fuel is non-toxic as it produce 30 percent to 90 percent less carbon monoxide and about 50 percent fewer toxins than gasoline engines, thus causing no harm to environment.
http://oildelivery.blogspot.com/2014/08/is-propane-gas-dangerous-for-environment.html