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The NO-NO<sub>2</sub> system was analyzed in different chemicalregimes/air masses based on observations of reactive nitrogen species andperoxy radicals made during the intensive field campaign MIRAGE-Mex (4 to 29 March 2006). The air masses were categorized into 5 groups based oncombinations of macroscopic observations, geographical location,meteorological parameters, models, and observations of trace gases: boundarylayer (labeled as "BL"), biomass burning ("BB"), free troposphere(continental, "FTCO" and marine, "FTMA"), and Tula industrial complex("TIC"). In general, NO<sub>2</sub>/NO ratios in different air masses are nearphotostationary state. Analysis of this ratio can be useful for testingcurrent understanding of tropospheric chemistry. The ozone productionefficiency (OPE) for the 5 air mass categories ranged from 4.5 (TIC) to 8.5 (FTMA),consistent with photochemical aging of air masses exiting the MexicoCity Metropolitan Area

atmospheric chemistry and physics

Characteristics of the NO-NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;-O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; system in different chemical regimes during the MIRAGE-Mex field campaign