Harmful chemicals emitted directly into the air from natural processes and human activities are called
a. secondary pollutants
b. smog
c. photochemical smog
d. tertiary pollutants
e. primary pollutants
Answer: E
Harmful chemicals emitted directly into the air from natural processes and human activities are called
a. secondary pollutants
b. smog
c. photochemical smog
d. tertiary pollutants
e. primary pollutants
Answer: E
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