Multiple choice

Which gas often creates more air-pollution?

  1. Nitrogen

  2. Carbondioxide

  3. Carbonmonoxide

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

Carbon monoxide (CO) is a major air pollutant from incomplete combustion of fossil fuels in vehicles, industrial processes, and poorly ventilated heating systems. CO is toxic because it binds to hemoglobin more readily than oxygen, causing asphyxiation. While CO2 is a greenhouse gas, CO creates more immediate local air pollution and health hazards.

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