Metropolitan Area (SPMA). During 2016, the 8-hour state standard of 140 µg m–3 was
exceeded on 32 days, whereas the 1-hour national standard of 160 µg m–3 was exceeded
on 76 days. Exposure to such unhealthy O3 levels and other pollutants can lead to
respiratory disease. The focus of this study is to determine the main O3 precursor in terms of
the volatile organic compounds (VOCs) in order to provide a scientific basis for controlling …