杭州市夏季臭氧污染特征及一次污染过程分析

Analysis of Characteristics of Ozone Pollution and a Pollution Process in Summer in Hangzhou

文章利用2016-2021年杭州市环境空气质量国控监测站点及杭州光化学网站点监测数据,分析杭州夏季臭氧浓度变化特征,并结合气象资料分析一次臭氧典型污染过程。研究表明,杭州市夏季臭氧污染严重,6月超标天数要高于7月和8月,夏季臭氧浓度日变化呈现“单峰型”,8月平均臭氧日变化的峰值要略高于6月和7月。2021年6月5-9日杭州市出现的一次中度污染的臭氧污染过程,主要是在不利气象条件以及较高浓度前体物影响下的本地生成,而6月7日在本地生成之外,还受到东北方向城市区域的污染传输影响。

Utilizing the data of Hangzhou state-controlled ambient air quality monitoring sites and Hangzhou photochemical site monitoring from 2016 to 2021,this study analyzed summer ozone concentration variation characteristics in Hangzhou,and a typical ozone pollution process study was studied based on meteorological data.The results showed that the ozone pollution in Hangzhou was serious in summer,and the number of days exceeding the standard in June was higher than that in July and August.The diurnal variation of ozone concentration in summer presented a single-peak type,and the peak value of the average diurnal variation of ozone in August was slightly higher than that in June and July.During June 5-9,2021,a moderately ozone pollution process occurred in Hangzhou,which was mainly generated locally under unfavorable meteorological conditions and high concentration of precursors.Besides,it was also affected by regional pollution transmission from the northeast urban area on June 7.