AP Environmental Scienceeasymcq1 pt
Which is a primary air pollutant?
A.Carbon monoxide from car exhaust
B.Tropospheric ozone
C.Sulfuric acid in acid rain
D.PANs in smog
Explanation
Core Concept
CO is emitted straight from the tailpipe — primary pollutants are released directly, unlike ozone and acids that form later.
Correct Answer
ACarbon monoxide from car exhaust
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