Volatile Organic Compounds in the North China Plain: Characteristics, Sources, and Effects on Ozone Formation

Enhanced volatile organic compounds (VOCs) observations were made on ozone-exceeding days in June 2020 Linyi, China. A total of 69 VOCs collected (1 alkyne, 29 alkanes, 10 alkenes, 14 aromatic hydrocarbons, and 15 oxygenated (OVOCs)). The average concentration (TVOCs) was 36.0 ± 0.66 ppb, the top three components OVOCs, which accounted for 40.75%, 27.02%, 11.30%, respectively. Based positive matrix factorization (PMF) model, main sources Linyi City divided into vehicle exhaust (39.11%), biomass combustion (21.82%), oil gas volatilization (21.46%), solvent use (17.61%). ozone formation potential (OFP) contribution rate dominated by aromatics, with rates 26.37%, 25.30%, 23.65%, six that contributed most to OFP formaldehyde, acetaldehyde, 1-butene, butadiene, trans-2-butene, propylene. empirical kinetic modelling approach (EKMA) curve indicated situ (O3) production limited VOCs, reducing O3 precursors accordance VOCs/NOx ratio 1.15 can control pollution more effectively.