Outdoor air pollution is reduced when ____.
A. buildings slow wind speed and reduce dilution of pollutants
B. hills and mountains reduce the flow of air in valleys
C. high temperatures promote formation of photochemical smog
D. chemical reactions produce acidic precipitation which falls out of the atmosphere
E. temperature inversions form over cities surrounded by mountains
Answer: D
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A. Change in momentum. B. Force of impact. C. both of these D. none of the above
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