Photochemical Smog Practice Test

An urban area implements tighter controls on gasoline vapor recovery at service stations and restricts use of certain solvent-based industrial coatings during summer afternoons. These measures primarily target which component of photochemical smog formation?

A suburban region downwind of a major highway corridor reports its highest ozone levels between 2–5 PM, even though traffic emissions are highest during the morning commute. Which explanation best accounts for the timing of peak ozone in photochemical smog?