Air pollution has only become an important urban problem in the last 75 years.
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Q83: Air pollution problems are most acute when
Q84: There are no natural sources of air
Q85: Air is never perfectly clean.
Q86: When air pollution episodes occur they generally
Q87: Air pollution events are usually associated with
Q89: Clear sunny days are part of the
Q90: Acid rain can be classified as a
Q91: Until the Industrial Revolution, humans had no
Q92: The ozone in smog is unrelated to
Q93: The largest single source of materials causing
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