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Air Pollution. Digital image. EPA. United States Environmental Protection Agency, n.d. Web. 21 Mar. 2016.

Carbon monoxide is an air pollutant that causes insufficient oxygen supply to the brain. This can result in headaches, dizziness, depression, memory loss and death. The graphic above shows sources of air pollutants in the United States, as of 2010.

Which source is the largest contributor to carbon monoxide emissions in the U.S.?

A

Stationary fuel combustion.

B

Highway vehicles.

C

Non-road mobile vehicles.

D

Industrial and other processes.

E

None of the above.

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