Question

what is not a form of indoor pollution?
ammonia
radon
ozone
tobacco

Explanation:

Ammonia can come from cleaning products, radon from soil and rocks seeping into buildings, tobacco from smoking indoors. Ozone is mainly an outdoor pollutant formed by chemical reactions in the atmosphere involving pollutants like nitrogen oxides and volatile organic compounds. It doesn't typically accumulate indoors in significant amounts compared to the others as a primary indoor - generated pollutant.

Answer:

ozone