A controversy involving human health issues and burning to maintain grassland health in the Flint Hills prompted this study. Available ground-level ozone and corresponding weather data for dates from April to October for the eleven-year period from 2002 to 2012 were subjected to statistical and synoptic climatic analysis. High ozone levels in the Flint Hills occurred during the presence of warm, dry air masses early in the warm season and more humid warm days in mid-summer. Synoptic analysis of ozone exceedance days in April documents the importance of surface high pressure to the east of the Flint Hills and weak southerly winds.