珠海横琴新区秋季大气污染特征与来源

Characteristics and Sources of Air Pollution in Autumn in Hengqin District, Zhuhai

基于2019年10-11月珠海横琴新区监测点位的大气污染物浓度监测数据与后向轨迹聚类分析等,系统研究了秋季横琴大气污染情况与污染潜在来源。秋季横琴最突出的空气污染问题是臭氧问题,O38 h第90百分位数为186微克/立方米,超过国家二级标准。臭氧与PM2.5浓度相关性较好,表明受区域输送的影响较显著。平均而言,当气团经过珠三角东部城市群时,横琴的臭氧污染最严重,当气团来源于近海或当天不同时段气团来源存在差异时,横琴的臭氧污染相对较轻。在臭氧日最大8小时浓度超过200微克/立方米的情况中,后向轨迹表明其来源可能是珠三角东部城市群或者大亚湾石化园区等所在的广东东部沿海。

Based on the monitoring data of air pollutant in Hengqin New District of Zhuhai and backward trajectory cluster analysis from October to November 2019,the air pollution situation and potential pollution sources in autumn were studied systematically.In autumn,the most prominent air pollution problem of Hengqin was the ozone problem.The 90 th percentile of O38 h was 186μg/m3,which exceeded the national secondary standard.The correlation between ozone and PM2.5 concentration was good,indicating that the regional transport had a significant impact.On average,when the air mass passed through the eastern urban agglomerations of the Pearl River Delta,the ozone pollution of Hengqin was the most serious.When the air mass came from offshore or there are differences in the air mass sources at different times of the day,the ozone pollution of Hengqin was relatively light.When the maximum O38 h concentration exceedsed 200μg/m3,the backward trajectory indicated that the sources may be the eastern urban agglomeration of the Pearl River Delta or the eastern coastal area of Guangdong where Daya Bay Petrochemical Park was located.