南水北调中线工程河南段大气PM2.5和PM10质量浓度特征研究

Study on the characteristics of atmospheric PM2.5 and PM10 mass concentrations in Henan section of the middle route of south-to-north water diversion project

利用2018年10月—2019年8月南水北调中线工程河南段沿渠设置的10个大气监测站细颗粒物(PM2.5)和可吸入颗粒物(PM10)的在线监测数据以及气温、湿度气象要素实测数据,分析了干渠河南段大气PM2.5和PM10的质量浓度水平分布特征及其与气象参数的关系.结果表明2018年10月—2019年8月中线河南段10个大气监测站大气PM2.5和PM10日均质量浓度为47.88~67.47μg·m-3和53.93~88.99μg·m-3,符合国家二级标准;月均质量浓度呈现显著的冬季高夏季低的变化规律,PM2.5和PM10月均质量浓度分别为47.92~68.02μg·m-3和54.00~91.33μg·m-3.沿着中线水北上,大气PM2.5和PM10颗粒物污染依次严重;PM2.5和PM10质量浓度显著相关;大气颗粒物浓度与气温呈负相关关系,与相对湿度的相关性不显著.

Along the main canal of south-to-north water division middle route project in Henan,the characteristics of mass concentrations of PM2.5 and PM10,and their distribution and correlation with meteorological parameters are analyzed using the online monitoring data of fine particulate matter(PM2.5)and inhalable particulate matter(PM 10)at 10 monitoring stations and meteorological elements such as wind direction,wind speed,air temperature,air pressure during October 2018—August 2019.The results show that the daily average concentrations of PM2.5 and PM10 at the ten monitoring sites along the Henan section of the main canal of South-to-North Water Division Middle Route Project during October 2018—August 2019 are 47.88~67.47μg·m-3 and 53.93~88.99μg·m-3 respectively,which is in line with national secondary standards.The monthly mean mass concentrations of PM 2.5 and PM 10 are higher in winter and lower in summer respectively,of which PM2.5 and PM10 at the highest are 47.92~68.02μg·m-3 and 54.00~91.33μg·m-3 respectively.Among the ten monitoring stations along the Henan section,PM pollution is getting heavier.The mass concentrations of PM2.5 and PM10 have significant correlation at all sites.The concentrations of atmospheric particulate matter have a negative correlation with air temperature and a positive correlation with relative humidity.