Multiple choice

The atmospheric pollution is caused by�

  1. O3

  2. CO

  3. CO2

  4. N2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon monoxide (CO) is a toxic gas produced by incomplete combustion, making it a significant atmospheric pollutant from vehicles and industry. While CO2 and O3 occur naturally, they can become pollutants at elevated levels. Nitrogen (N2) is inert and makes up 78% of Earth's atmosphere without causing pollution.

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