Sensitivities of Ozone Air Pollution in the Beijing–Tianjin–Hebei Area to Local and Upwind Precursor Emissions Using Adjoint Modeling

Effective mitigation of surface ozone pollution entails detailed knowledge the contributing precursors’ sources. We use GEOS-Chem adjoint model to analyze precursors in Beijing–Tianjin–Hebei area (BTH) China on days different severities June 2019. find that BTH heavily polluted is sensitive local emissions, as well emitted from provinces south (Shandong, Henan, and Jiangsu, collectively SHJ area). Heavy can be mitigated effectively by reducing NOx (from industrial processes transportation), ≥C3 alkenes on-road gasoline vehicles processes), xylenes paint use) both SHJ, CO processes, transportation, power generation) ≥C4 alkanes solvent use, vehicles) emissions SHJ. In addition, reduction NOx, xylene, alkene within would decrease number ozone-exceedance days. Our analysis pinpoint key areas activities for locally regionally coordinated emission control efforts improve air quality BTH.