[Changes in O-VOCs-NO Sensitivity and VOCs Sources at an Urban Site of Nanjing Between 2020 and 2021].

The synergistic control of PM and ozone (O) are the focus of air quality improvement during the 14 Five-Year Plan in China. The production of O shows a highly nonlinear relationship with its precursors volatile organic compounds (VOCs) and nitrogen oxides (NO). In this study, we conducted online observations of O, VOCs, and NO at an urban site in downtown Nanjing from April to September of 2020 and 2021.