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.
This is a companion discussion topic for the original entry at https://www.techhive.com/article/3455222/laser-egg-plus-review.html#tk.rss_reviews