AP Environmental Sciencemediummcq1 pt
Which sequence leads to photochemical smog?
A.Morning emissions → sunlight → ozone and PANs by afternoon
B.Sunlight → ozone → emissions
C.Rain → VOCs → ozone
D.Nighttime cooling → ozone → smog
Explanation
Core Concept
Traffic emits NOx and VOCs at rush hour, and solar photons drive their conversion to ozone and PANs — the daily smog cycle.
Correct Answer
AMorning emissions → sunlight → ozone and PANs by afternoon
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