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Natural gas is lighter than air - If natural gas escapes into the atmosphere, it dissipates rapidly whereas a heavier-than-air gas, such as propane or gasoline, would settle and accumulate near the ground.
Natural gas is colorless - When mixed with the proper amount of air and ignited, invisible natural gas burns with a clean, blue flame. It is one of the cleanest burning fuels, producing primarily heat, carbon dioxide and water vapor.
Natural gas is odorless - When taken from the ground, natural gas is odorless. A harmless but pungent odor is added as a safety precaution. The odorant is so powerful you can smell even the smallest quantity of gas in the event of a leak.