Multiple choice

What is a thick brownish haze formed when certain gases in the air react with sunlight?

  1. Radon

  2. carbonmonoxide

  3. photochemical smog

  4. hydrogen

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

Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds react to sunlight, creating a brownish haze.