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Measurements and predictions of ambient ozone (O₃), planetary boundary layer (PBL) height, the surface energy budget, wind speed, and other meteorological parameters were made near downtown Houston, Texas, and were used to investigate meteorological controls on elevated levels of ground‐level O₃. Days during the study period (1 April 2009 to 31 December 2010 for measurements and 15 April 2009 to 17 October 2009 for modeled) were classified into low (LO₃) and high ozone (HO₃) days. The majority of observed high HO₃ days occurred in a postfrontal environment. Observations showed there is not a significant difference in daily maximum PBL heights on HO₃ and LO₃ days. Modeling results showed large differences between maximum PBL heights on HO₃ and LO₃ days. Nighttime and early morning observed and modeled PBL heights are consistently lower on HO₃ days than on LO₃ days. The …