Multiple choice

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

  1. Carbon Monoxide

  2. Methane

  3. Carbon dioxide

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

Carbon monoxide (CO) is the primary harmful gas emitted by automobiles. It is highly toxic because it binds to hemoglobin more strongly than oxygen, reducing blood's oxygen-carrying capacity and causing asphyxiation. While methane and CO2 are also emitted, CO is the most directly harmful to human health at typical concentrations.

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