Discussion
Which conditions favour a photochemical smog episode?
Answer: B
Photochemical ozone formation requires sunlight, warmth and time, so stagnant sunny anticyclonic conditions in summer produce the classic episodes. Winter inversions trap primary pollutants instead and produce a different kind of episode. Distinguishing the summer photochemical from the winter primary pollution episode is essential for understanding air quality forecasts. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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