Impacts of condensable particulate matter on atmospheric organic aerosols and fine particulate matter (PM_2.5) in China

Abstract. Condensable particulate matter (CPM) emitted from stationary combustion and mobile sources exhibits high emissions a large proportion of organic components. However, CPM is not generally measured when conducting emission surveys PM in most countries, including China. Consequently, previous inventories have included rates for CPM. Here, we construct an inventory China with focus on aerosols (OAs) based collected information. Results show that OA are enhanced twofold after the inclusion new years 2014 2017. Considering model representations secondary (SOA) formation CPM, series sensitivity cases been simulated here using three-dimensional Community Multiscale Air Quality (CMAQ) to estimate contributions atmospheric fine (PM2.5, aerodynamic diameter exceeding 2.5 µm) concentrations Compared observations at Beijing site during haze episode 14 October November 2014, estimates temporal average primary (POA) SOA were greatly improved effects. These scenarios demonstrated significant POA (51 %–85 %​​​​​​​), (42 %–58 %), total (45 %–75 %). Furthermore, over 2 major cities 26 other Beijing–Tianjin–Hebei region (hereafter referred as “BTH2 + cities”) December 2018, up 49 %, 53 54 50 % Handan, Shijiazhuang, Xingtai, Dezhou, respectively. Correspondingly, also narrowed gap between observed PM2.5 BTH2 cities. results improve simulation performance may provide important implications OA.