Environmentalhard · Past Paper
What is the primary pollutant that causes 'Pan' (Peroxyacetyl Nitrate) formation in photochemical smog?
ACarbon dioxide
BNitrogen oxides and Hydrocarbons
CSulfur dioxide
DAmmonia
✓ Correct Answer: B — Nitrogen oxides and Hydrocarbons
PAN is a secondary pollutant formed by the reaction of hydrocarbons and nitrogen oxides under sunlight.
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