Multiple choice

Air pollution is not caused by

  1. pollen grains

  2. hydroelectric power

  3. industries

  4. automobiles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hydroelectric power plants generate electricity through water flow without burning fuels, so they don't produce air pollution or greenhouse gases during operation. Pollen grains (A), industries (C), and automobiles (D) all contribute to air pollution - pollen as natural particulate matter, industries through emissions, and automobiles through exhaust.

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