Cai-Xia Wen

Long-Term Trends and Nonlinear PM2.5–O3 Coupling in a Typical Oilfield City of the “2 + 26” Region

Fine particulate matter (PM2.5) and ozone (O3) are the two dominant air pollutants in China, yet their coupling relationship at the daily urban scale remains debated because observational correlations are often confounded by meteorology. This study investigates the nonlinear PM2.5–O3 relationship in Puyang, a typical o...