What is the primary chemical oxidant that produces photochemical smog in urban atmospheres?
Answer and explanation
Correct answer: D. Ozone (O3) and Peroxyacetyl nitrate (PAN)
- Step 1: Photochemical smog forms when sunlight acts on vehicular exhaust gases containing NOx and volatile organic compounds (VOCs). Step 2. Photolysis produces secondary oxidants, predominantly tropospheric ozone (O3) and eye-irritating PAN (peroxyacetyl nitrate). Answer: Ozone (O3) and Peroxyacetyl nitrate (PAN). Why not the others: CO does not produce smog haze; SO2 produces industrial (London) reducing smog; methane is relatively unreactive in smog formation.
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