Both gases contribute to surface ozone production (PO3), reacting with OH at the following rates: acrolein, 5.0 x 1011 cm3 molecule1 s1 , and benzene, 1.28 x 1012 cm3 molecule1 s1 . What are their lifetimes against OH oxidation? Assume OH concentrations are equal to 2.6 x 106 molecules cm3 within the boundary layer and 1 x 106 molecules cm3 within the free-troposphere for 10 daylit hours each day. At other times, OH concentrations are zero.

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