The higher the Air Quality Index, the better the quality of the air.
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Q93: The largest single source of materials causing
Q94: Rain is naturally somewhat acidic.
Q95: Sulfur dioxide does not produce any secondary
Q96: During the Great Smog of 1952, visibility
Q97: The single largest source of air pollutants
Q99: The Environmental Protection Agency was created in
Q100: Air pollution declined significantly during the 1930s.
Q101: Air pollution problems seldom occur when winds
Q102: Forest fires triggered by lightning are one
Q103: Clear nighttime skies lead to reduced concentrations
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