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Which Statement Best Describes What Has Happened to Air Quality

Question 21

Multiple Choice

Which statement best describes what has happened to air quality since the United States outlawed the use of chlorofluorocarbons,halons,and carbon tetrachloride?


A) Air quality immediately improved
B) Air quality is slowly improving
C) Little change occurred because these chemicals remain in the atmosphere
D) Nothing has happened because other countries worldwide continue to extensively use these products.

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