In what way do motor vehicles harm the environment?

  1. By increasing radon levels.
  2. By decreasing radon levels.
  3. By decreasing carbon monoxide levels.
  4. By increasing carbon monoxide levels.

Correct Answer

By increasing carbon monoxide levels.

Explanation: Carbon monoxide is a poisonous gas emitted by vehicle exhausts into the atmosphere. Driving economically and keeping a vehicle well maintained can reduce the level of carbon monoxide emissions.

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