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Ozone (O₃) and secondary fine particles come from the atmospheric oxidation chemistry that involves the hydroxyl radical (OH) and hydroperoxyl radical (HO₂), which are together called HO_x. Radical precursors such as nitrous acid (HONO) and formaldehyde (HCHO) significantly affect the HO_x budget in urban environments. These chemical processes connect surface anthropogenic and natural emissions to local and regional air pollution. Using the data collected during the Study of Houston Atmospheric Radical Precursors (SHARP) in spring 2009, we examine atmospheric oxidation chemistry and O₃ production in this polluted urban environment. A numerical box model with five different chemical mechanisms was used to simulate the oxidation processes and thus OH and HO₂ in this study. In general, the model reproduced the measured OH and HO₂ with all five chemical mechanisms producing similar levels …