邯郸地区2017—2021年PM_(2.5)和O_(3)污染特征

Pollution Characteristics of PM_(2.5) and O_(3) in Handan Region from 2017 to 2021

利用实时监测数据分析2017—2021年邯郸市及周边区县PM_(2.5)和O_(3)污染特征。研究发现:2017—2021年各地区PM_(2.5)年均质量浓度持续降低,轻度及轻度以上污染逐渐减少;2017—2019年O_(3)污染加剧,2020年起O_(3)年均质量浓度逐年下降,污染天不断减少。PM_(2.5)和O_(3)-8 h分别在1月(平均浓度为127.3μg/m^(3),平均超标22d)和6月(平均浓度为233.4μg/m^(3),平均超标22 d)污染最严重。结合气象参数分析来看,PM_(2.5)与温度、风速和降水量呈显著负相关,与相对湿度呈显著正相关;O_(3)-8 h与温度呈显著正相关,而与风速、湿度和降水量的相关性较弱。后向轨迹和潜在源分析表明:邯郸地区PM_(2.5)典型污染月受山西省中部地区污染传输影响最大,O_(3)典型污染月受河南省东部污染传输影响最大。

The real-time monitoring data were used to analyze the pollution characteristics of PM_(2.5) and O_(3) in Handan and its surrounding areas from 2017 to 2021.The results showed that the annual average concentration of PM_(2.5) in all regions continued to decrease from 2017 to 2021 with light pollution or above gradually decreased.From 2017 to 2019,O_(3) pollution intensified.Since 2020,the annual average concentration of O_(3) decreased year by year,and the number of pollution days continued to decrease.PM_(2.5) and O_(3)-8 h were the most serious polluted factors in January(average concentration of 127.3μg/m^(3)and exceeding 22 days)and June(233.4μg/m^(3)and average exceeding 22 days),respectively.Combined with the meteorological parameters,PM_(2.5) was significantly negatively correlated with temperature,wind speed and precipitation,and significantly positively correlated with relative humidity.O_(3)-8 h was positively correlated with temperature,and weakly correlated with wind speed,humidity and precipitation.Backward trajectory and potential source analysis showed that the typical month of PM_(2.5) pollution in Handan was most affected by pollution transport in the central of Shanxi Province,and the typical month of O_(3) pollution was most affected by the transport in eastern Henan Province.