In big cities, air pollution is mainly due to:
Correct answer: D. Burning of fossil fuel
- A. Suspended particles
- B. Thermal power plants
- C. Sewage
- D. Burning of fossil fuel
Explanation
In large cities, fossil-fuel combustion in vehicles, industries and heating systems is a major source of air pollution, releasing gases and particulates. Thermal power plants contribute, but they are one component of the broader fossil-fuel source.
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