Question

which of the following is one of the four most dangerous indoor air pollutants as identified by the environmental protection agency? radioactive radon gas oxygen pet odors cooking smells

Explanation:

The Environmental Protection Agency identifies radioactive radon gas as one of the four most dangerous indoor air - pollutants. Oxygen is a necessary gas for life and not a pollutant. Pet odors and cooking smells are usually just nuisances and not among the most dangerous pollutants.

Answer:

radioactive radon gas