Why does the atmospheric concentration of non-methane hydrocarbons peak at 8:00 a.m., and then decrease throughout the day? b. Why does the atmospheric concentration of aldehydes peak at 1:00 p.m., and then decrease throughout the afternoon? c. Why does the atmospheric concentration of oxidants/PAN (PAN and peroxides are oxidants) peak at 3:00 p.m.?

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