英山县大气污染特征及气象影响分析

Air Pollution Characteristics and Meteorological Impact Analysis of Yingshan County

收集2016-2022年英山县鸡鸣尖监测站点的6项大气指标和AQI数据,分析了各项污染物浓度的变化特征,并结合风速、风向、温度、湿度、降水量等气象因素探讨了导致大气污染物浓度变化的原因、PM_(2.5)来源途径和O_(3)季节性变化趋势,从而探究英山县污染来源。结果表明:英山县域的污染潜在源区主要分布在安徽北部及鄂豫皖三省交界地区。PM_(2.5)污染时段主要在春、冬两季,以轻度污染为主,O 3污染时段发生在3-10月,以轻度污染为主。温度是影响O 3浓度变化的关键因素,强太阳辐射促进了光化学反应生成O_(3)。高湿度促进二次气溶胶形成,即加快NO_(2)—NO_(3)^(-)和SO_(2)-SO_(4)^(2-)的形成,使NO_(2)浓度升高。

In this paper,to analyze the change characteristics of each pollutant concentration,six atmospheric monitoring indicators and AQI monitoring data were collected from Jimingjian monitoring station in Yingshan County during 2016-2022.Combined with the meteorological factors(such as wind speed,wind direction,temperature,relative humidity and precipitation)of Yingshan County,the reasons leading to the change of atmospheric pollutant concentration,the source of PM_(2.5) and the seasonal change of O_(3) were analyzed so as to explore the source of pollution in Yingshan County.The results show that the pollution in Yingshan County may be mainly affected by the northern part of Anhui Province and the border area of Hubei,Henan and Anhui provinces,that PM_(2.5) pollution period mainly occurs in spring and winter,and is mainly light pollution,that the O_(3) pollution period occurs from March to October,and is also mainly mild pollution and that temperature is the key factor affecting the formation process of O_(3).At high temperature,strong solar radiation can promote photochemical reaction to produce O_(3).High humidity will promote the formation of secondary aerosols,that is,accelerate the formation of NO_(2)-NO_(3)^(-) and SO_(2)-SO_(4)^(2-)4 and increase NO_(2) concentration..