Abstract
The role of nitrogen oxides in the tropospheric photochemical system is re‐evaluated in the light of recent measurements of the rate constants for two key reactions. A model for nitrogen oxides is discussed which yields surface NO x (NO+NO 2 ) levels approaching 1 ppb in NO x source regions but less than 0.1 ppb outside source regions. Applying the new rate coefficients implies increased radical concentrations and a more intense O 3 and CO photochemistry. Even for densities of 0.1 ppb or less, NO x still leads to significant local O 3 production and conversion of HO 2 to OH. Unrealistic O 3 profiles are obtained with the new rate coefficients for surface NO x densities of about 1 ppb, while reasonable agreement with observation is obtained with lower NO x densities. Feedback processes between CO, NO x , OH, and CH 4 are also discussed.
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