Emission inventory of air pollutants and chemical speciation for specific anthropogenic sources based on local measurements in the Yangtze River Delta region, China

Abstract. A high-resolution air pollutant emission inventory in the Yangtze River Delta (YRD) region was updated for the year 2017 using emission factors and chemical speciation mainly from local measurements in this study. The inventory includes 424 NMVOC species and 43 PM2.5 species, which can be subdivided into 259 specific source categories. The total emissions of SO2, NOx, CO, NMVOCs, PM10, PM2.5, and NH3 in the YRD region in 2017 are 1,552, 3,235, 38,507, 4,875, 3,770, 1,597, and 2,467 Gg, respectively. SO2 and CO emissions are mainly from boilers, accounting for 49 % and 73 %, respectively. Mobile sources dominate the NOx emissions and contribute 57 % of the total. VOC emissions mainly come from industrial sources, occupying 61 %. Dust sources take up to 55 % and 28 % of PM10 and PM2.5 emissions, respectively. Agricultural sources account for 91 % of NH3 emissions. Major PM2.5 species are OC, Ca, Si, PSO4 and EC, accounting for 9.0 %, 7.0 %, 6.4 %, 4.6 % and 4.3 % of total PM2.5 emissions. The main species of VOCs are aromatics, accounting for 25.3 %. OVOCs contribute 21.9 % of total VOC emissions. Toluene has the highest comprehensive contribution to ozone and SOA formation potentials, and the others are 1,2,4-trimethylbenzene, m,p-xylene, propylene, ethene, o-xylene, ethylbenzene and so on. Industrial process and solvent use sources are the main sources of ozone and SOA formation potential, followed by motor vehicles. Among industrial sources, chemical manufacturing, rubber & plastic manufacturing, appliance manufacturing and textile have made relatively outstanding contributions. The inventory can provide scientific guidance for future joint control of air pollutants in the YRD region, China.