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

摘要

A high-resolution air pollutant emission inventory for the Yangtze River Delta (YRD) region was updated for 2017 using emission factors and chemical speciation based mainly on local measurements in this study. The inventory included 424 non-methane volatile organic compounds (NMVOCs) and 43 fine particulate matter (PM 2.5 ) species from 259 specific sources. The total emissions of SO 2 , NO x , CO, NMVOCs, PM 10 , PM 2.5 , and NH 3 in the YRD region in 2017 were 1552, 3235, 38?507, 4875, 3770, 1597, and 2467?Gg, respectively. SO 2 and CO emissions were mainly from boilers, accounting for 49?% and 73?% of the total. Mobile sources dominated NO x emissions, contributing 57?% of the total. NMVOC emissions, mainly from industrial sources, made up 61?% of the total. Dust sources accounted for 55?% and 28?% of PM 10 and PM 2.5 emissions, respectively. Agricultural sources accounted for 91?% of NH 3 emissions. Major PM 2.5 species were OC, Ca, Si, PSO 4 , and EC, accounting for 9.0?%, 7.0?%, 6.4?%, 4.6?%, and 4.3?% of total PM 2.5 emissions, respectively. The main species of NMVOCs were aromatic hydrocarbons, making up 25.3?% of the total. Oxygenated volatile organic compounds (OVOCs) contributed 21.9?% of the total NMVOC emissions. Toluene had the highest comprehensive contribution to ozone (O 3 ) 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 process and solvent-use sources were the main sources of O 3 and SOA formation potential, followed by motor vehicles. Among industrial sources, chemical manufacturing, rubber and plastic manufacturing, appliance manufacturing, and textiles made significant contributions. This emission inventory should provide scientific guidance for future control of air pollutants in the YRD region of China.