The main difference between primary air pollutants and secondary air pollutants is_____________
A. Former contains water molecules, while secondary pollutants do not.
B. Primary air pollutants have more direct effect on human health.
C. Former are released directly into the atmosphere, while the latter are formed by chemical reactions in the atmosphere.
D. Primary air pollutants are formed through photochemical reactions in the sunlight, while the secondary air pollutants are not.
Answer:C
The main difference between primary air pollutants and secondary air pollutants is_____________
A. Former contains water molecules, while secondary pollutants do not. B. Primary air pollutants have more direct effect on human health. C. Former are released directly into the atmosphere, while the latter are formed by chemical reactions in the atmosphere. D. Primary air pollutants are formed through photochemical reactions in the sunlight, while the secondary air pollutants are not.