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Not only that, but poisonous gases (mainly H2S) are also present in natural gas, which can kill you in concentrations as low as 100 ppm, which, in percentage te
by d1tchdigger 8y ago
Not only that, but poisonous gases (mainly H2S) are also present in natural gas, which can kill you in concentrations as low as 100 ppm, which, in percentage terms, is 0.01%. This gas is heavier than air, so it also tends to concentrate in low lying areas.