Does carbon monoxide rise?
Carbon monoxide will rise indoors. CO is slightly lighter (28amu) than O2 (32amu) which comprises about 21% of air and of equal mass to N2 (28amu) which comprises pretty much all of the remaining 79%. So its density is very slightly lower.
CO is found to evenly distribute itself indoors. It is worth mentioning that CO indoors is usually generated from incomplete combustion (heat source) and therefore traveling in a warm air stream. Warm air is more buoyant and does rise.
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