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  • What gas is responsible for photochemical smog?
Multiple choice

What gas is responsible for photochemical smog?

  1. CO2

  2. SO2

  3. NO2

  4. CO

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Photochemical smog is primarily formed by the reaction of nitrogen oxides (NO2) and volatile organic compounds with sunlight. Nitrogen dioxide is a key precursor in this process.

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