Trend Analysis of Historical Ambient Ozone, NOx, and VOC Data in San Antonio, Texas

The San Antonio area is growing rapidly, and monitoring stations in and around the city have measured levels of ozone above the 2015 federal ozone standard during spring and summer. Ambient air quality data have been collected in the San Antonio area for many years, and a full analysis of these data should be useful in identifying causes of high ozone. Although analyses of data records of ozone, nitrogen oxides, volatile organic compounds, and meteorological data have not unambiguously identified the causes of high ozone in San Antonio, the data do suggest hypotheses that can be tested by more sophisticated observational studies. These analyses will be discussed, some hypotheses will be proposed, and a brief description of one such observational study, the May 2017 San Antonio Field Study, will be presented.