Deadly gases like carbon monoxide and radon get most of the attention when we talk about indoor pollutants. But carbon dioxide, a waste product produced by all aerobic organisms when they breathe out, is far more prevalent in our homes and workplaces. The math here is simple: the more people you have in a room or building, the more CO2 you have being expelled in the air. Add poor ventilation to the mix, along with the odd fireplace and gas burning stove, and you have pathway to pollution. CO2...

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