Multiple choice

Air pollution is not caused by�

  1. Thermal power plant

  2. Diesel engine

  3. Hydroelectric power station

  4. Pollen grain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hydroelectric power stations generate electricity without burning fuel, so they don't emit air pollutants. The other options all produce emissions: thermal plants burn coal, diesel engines burn fuel, and pollen grains are natural airborne particulates. Hydroelectricity is a clean energy source for air quality.

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