Multiple choice

The major harmful gas emitted by automobile vehicles which causes air pollution is ____________.

  1. Carbon Monoxide

  2. Carbon Dioxide

  3. Oxygen

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon monoxide (CO) is produced when fuel doesn't burn completely in vehicle engines. It's highly toxic because it binds to hemoglobin in blood more strongly than oxygen, reducing oxygen delivery to tissues. While vehicles also emit CO2, CO is the immediate health hazard.

Keep practicing — related questions