Which are the primary constituents of photochemical smog?
Correct answer: A. NO2 and hydrocarbons
- A. NO2 and hydrocarbons
- B. SO2 and CO2
- C. Carbon di-oxide and NO2
- D. Hydrocarbons and CFCs
Explanation
The primary ingredients of photochemical smog are nitrogen dioxide and reactive hydrocarbons, which sunlight converts into secondary pollutants such as ozone and PAN. Sulphur dioxide is more closely associated with industrial, or reducing, smog.
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