宜昌市城区PM_(2.5)污染形成灰霾天气的规律研究

2012年选取与气象站点相邻的一个环境空气质量测点对PM2.5进行了研究性监测,测点距地面23m,全年PM2.5质量浓度在19~284μg/m3之间,年均质量浓度为89μg/m3,月均质量浓度最高的为1月.系统分析全年PM2.5监测质量浓度与相邻气象测点灰霾、能见度观测数据之间的关系,得到以下结论:宜昌市城区PM2.5污染质量浓度与灰霾观测值相关性不强,但与能见度的观测值显著相关;全年能见度降低受PM2.5污染的影响具有季节性,2、5~6三个月与7~9三个月及4、10~11三个月,这3组月份内的PM2.5与能见度之间的回归曲线基本一致,全年中3月份影响最大,而1月份最小,主要与气温、风速、降雨因素有关.

Discussion on Haze Formation of PM2.5 Pollution in Urban Area of Yichang

In 2012,an ambient air quality monitoring site was selected for the investigative PM2.5 monitoring , nearby the meteorological station and 23 metres from the ground.The mean annual PM2.5 concentration was between 19 and 284μg/m3 .The highest monthly average concentration was in March.It was systematically analyzed for the relationship between the PM2.5 monitoring concentration and haze,visibility observation da-ta.The results showed that：the PM2.5 pollution concentration was not strongly correlated with the haze ob-servation value but significantly related to the visibility observation data.The reduced visibility affected by PM2.5 pollution has seasonal the whole year around.February,May and June as a group,July,August and September as a group ,April,October and November as a group,the regression curve between visibility and PM2.5 concentration are basically the same in every group.Throughout the year,effect of PM2.5 concentration on visibility was in March,the largest,minimum in January,mainly related to air temperature,wind speed, rainfall factors.