Study on a Special Ozone Pollution Process in Beihai City
An ozone pollution process in beihai city on May 4-5,2022 was investigated.The results show that the 8-hour average of O3 is unevenly distributed,with the highest point being 172.0μg/m3 and the lowest point being 120.0μg/m3.VOCs qualitative and quantitative analysis of 54 organic compounds,detected benzene,1,2-dichloropropane,toluene,ethylbenzene,m-xylene(p-xylene),1,2,4-trimethylbenzene,concentration level of 0.4～3.2μg/m3,the other 48 organic compounds were not detected.By qualitative analysis of parallel samples,seven organic compounds including acetonitrile,n-hexane,1,3-dichloropropanol,2,6-ditert-butylcresol and aldehyde were detected.The correlation analysis between nitrogen dioxide and ozone showed that during the pollution days,there was a significant decrease of nitrogen dioxide concentration in daytime and a sharp increase of ozone,and there was a high negative correlation between the two,and a moderate negative correlation between the two at night.HYSPLIT backward track was used to trace the source of air mass,and the cities with 1 000 m tracks also had ozone exceeding to the standard,suggesting that ozone pollution was transmitted through each other.
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