Choose the statement that is NOT true regarding outdoor air pollution sources in the United
States.
Natural sources of air pollution, such as forest fires and volcanoes, account for
the majority of chlorofluorocarbon emissions.
Power plants contribute the majority of the sulfur dioxide in the atmosphere.
Approximately half of man-made air pollution emissions come from stationary
sources.
Highway vehicles and other mobile sources contribute about 60% of national
carbon monoxide
emissions.