Multiple choice

Air pollution is caused by�

  1. Automobile exhausts

  2. Radioactive substances

  3. Smoke

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Air pollution has multiple anthropogenic sources: vehicle exhaust emits nitrogen oxides and particulates, radioactive substances from nuclear activities, and smoke from burning biomass or fossil fuels. Each contributes significantly to atmospheric contamination.

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