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Natural gas is mainly methane. Methane is not actually poisonous, but you could suffocate from breathing it if there's not some oxygen mixed in with it (and if there is oxygen mixed in with it, then it's an explosion hazard).

Also, "natural" natural gas is not entirely methane... it may contain small amounts of other chemicals which are much much more dangerous than methane itself is. For example, hydrogen sulfide is a very toxic gas that's often found in association with methane.

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14y ago

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