Study of the characteristics and sources of VOCs and its sensitivity to ozone formation in Haining
Based on the on-line measurement data in Haining City from August 1st to October 31st 2021,the VOCs concentration,the main sources and controlling factors of O3 pollution were analyzed.Different reduction scenarios were set to study the impact of precursor changes on O3 formation.During the observation period,O3 pollution mostly occurred during periods of high temperature,low humidity and high-volume mixing ratio of TVOCs.Alkanes and halides were the major contributors to VOCs concentration,while aromatics contributed the most to the ozone formation potential(OFP).Source apportionment revealed that the petrochemical industry was the largest source(31.0%).Solvent usage and the petrochemical industry contributed the most to the OFP(35.0%and 27.8%,respectively).Pearson correlation analysis suggested that biological sources and paint evaporation sources had a high correlation with temperature.The case study of the September 28th to October 2nd episode of O3 pollution indicated that aromatics was the most sensitive species.The results of different emission reduction scenarios indicated that simultaneously reducing VOCs and NOx emissions can effectively alleviate O3 pollution in Haining City,with VOCs reduction showing a more significant impact.
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