Which pollutant are you more likely to encounter in dangerous concentrations indoors rather than outdoors?

Question

Quizplus · Accepted Answer

Carbon monoxide is most commonly found in indoor air due to incomplete combustion of fuels. This is especially true in poorly ventilated areas, such as a closed garage with a running car. Indoor levels of carbon monoxide can reach dangerous concentrations quickly, leading to headaches, nausea, and even death. Nitrogen dioxide and sulfur dioxide can also be found indoors, but typically in lower concentrations. Ozone, on the other hand, is more commonly found outdoors due to the reaction of sunlight with pollutants such as nitrogen oxides and volatile organic compounds.

Which Pollutant Are You More Likely to Encounter in Dangerous