In what way do motor vehicles harm the environment?

By decreasing radon levels.
By increasing carbon monoxide levels.
By decreasing carbon monoxide levels.
By increasing radon levels.

Explantion: 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.

Theory Tester

In what way do motor vehicles harm the environment?

Managing Risk