9. Secondary air pollutants are formed by
(A) The evaporation of solvents and gasoline
(B) The incomplete combustion of fuels
(C) Primary pollutants reacting with other compounds in the atmosphere
(D) Radioactive substances such as radon reacting with primary pollutants
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(A) The evaporation of solvents and gasoline
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c) Primary pollutants reacting with other compounds in the atmosphere.
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