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. A high-resolution air pollutant emission inventory forthe Yangtze River Delta (YRD) region was updated for 2017 using emissionfactors and chemical speciation based mainly on local measurements in thisstudy. The inventory included 424 non-methane volatile organic compounds(NMVOCs) and 43 fine particulate matter (PM2.5) species from 259specific sources. The total emissions of SO2, NOx, CO, NMVOCs,PM10, PM2.5, and NH3 in the YRD region in 2017 were 1552,3235, 38 507, 4875, 3770, 1597, and 2467 Gg, respectively. SO2 andCO emissions were mainly from boilers, accounting for 49 % and 73 % ofthe total. Mobile sources dominated NOx emissions, contributing 57 % of the total. NMVOC emissions, mainly from industrial sources, made up61 % of the total. Dust sources accounted for 55 % and 28 % ofPM10 and PM2.5 emissions, respectively. Agricultural sourcesaccounted for 91 % of NH3 emissions. Major PM2.5 species wereOC, Ca, Si, PSO4, and EC, accounting for 9.0 %, 7.0 %, 6.4 %,4.6 %, and 4.3 % of total PM2.5 emissions, respectively. The mainspecies of NMVOCs were aromatic hydrocarbons, making up 25.3 % of thetotal. Oxygenated volatile organic compounds (OVOCs) contributed 21.9 % ofthe total NMVOC emissions. Toluene had the highest comprehensivecontribution to ozone (O3) and secondary organic aerosol (SOA)formation potentials, while other NMVOCs included 1,2,4-trimethylbenzene,m,p-xylene, propylene, ethene, o-xylene, and ethylbenzene. Industrial processand solvent-use sources were the main sources of O3 and SOA formationpotential, followed by motor vehicles. Among industrial sources, chemicalmanufacturing, rubber and plastic manufacturing, appliance manufacturing,and textiles made significant contributions. This emission inventory shouldprovide scientific guidance for future control of air pollutants in the YRDregion of China.

atmospheric chemistry and physics

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