重庆市荣昌区臭氧典型污染时段VOCs来源分析

Analysis of VOCs Sources during Typical Ozone Pollution Periods in Rongchang District,Chongqing City

本研究利用重庆市荣昌区国控空气质量监测站点采集环境空气样品,测定大气中57种挥发性有机物(VOCs)的质量浓度,分析2022年春季典型污染时段O_(3)及其前体物的浓度分布特征。其间通过对比VOCs的臭氧生成潜势(OFP),判定排名前20的关键物种,初步梳理出对O_(3)生成贡献的相关行业,利用正定矩阵因子分解(PMF)模型进行源解析。研究表明,在温度升高、大气扩散条件不利的情况下,荣昌区春季容易出现O_(3)浓度连续超标。源解析结果显示,主要贡献源为交通源、溶剂使用源、工业源和植物源。

This study uses the national air quality monitoring stations in Rongchang District,Chongqing City to collect environmental air samples,measure the mass concentrations of 57 volatile organic compounds(VOCs) in the atmosphere,and analyze the concentration distribution characteristics of O_(3) and its precursors during typical pollution periods in spring 2022.During this period,by comparing the ozone formation potential(OFP) of VOCs,the top 20 key species are identified,and the relevant industries contributing to O_(3) formation are preliminarily identified,and the positive matrix factorization(PMF)model is used for source analysis.Research has shown that in the case of temperature rise and unfavorable atmospheric diffusion conditions,the concentration of O_(3) in Rongchang District is prone to continuously exceed the standard in spring.The source analysis results show that the main contributing sources are transportation sources,solvent use sources,industrial sources,and plant sources.