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Ozone Is a Necessary,protective Component of the ________,But Is Considered

Question 100

Multiple Choice

Ozone is a necessary,protective component of the ________,but is considered a pollutant in the ________.


A) troposphere, upper atmosphere
B) troposphere, air
C) photochemical smog, air we breathe
D) upper atmosphere, troposphere
E) air we breathe, upper atmosphere

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