Which of the following statements with respect to the health and economic effects of air pollution is true?
A. Health effects of air pollution include headaches, coughs, and dizziness-considerable annoyances and discomfort but they are rarely life-threatening
B. Nearly 1,500 hospital admissions and emergency-room visits could have been avoided in California during a two-year period if federal clean-air standards had been met.
C. Scientists do not know how much air pollution, for how long a period of time, will cause birth defects, nervous system damage, and death.
D. The number of premature deaths due to outdoor air pollution may increase globally to 2 million people by 2060.
Answer: C
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