Moderate

Air pollution is not caused by:

Correct answer: C. Hydroelectric power station

  • A. Thermal power plant
  • B. Diesel engine
  • C. Hydroelectric power station
  • D. Pollen grain

Explanation

Hydroelectric stations generate electricity without combustion, so they do not normally release the combustion pollutants produced by thermal plants or diesel engines. Pollen grains can also act as natural airborne pollutants or allergens.

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