- 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.
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Answer:
C
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Former are released directly into the atmosphere, while the latter are formed by chemical reactions in the atmosphere.
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