绵阳市PM2.5、PM10变化特征和城郊对比分析

本次工作以四川省绵阳市颗粒物(PM2.5和PM10)污染变化特征为研究对象,利用绵阳市国控监测站结合西南科技大学自建监测站获得的PM2.5、PM10质量浓度数据,对2017年9月至2018年9月期间绵阳市城郊PM2.5和PM10质量浓度进行了分析,探讨了两者的季节变化和日变化,以及两者之间的相关性,阐释了污染颗粒的可能来源,并对比了城区与郊区的日变化差异。结果表明,绵阳市PM2.5、PM10质量浓度季节间差异较大,污染程度整体上呈现冬季>春季>秋季>夏季的特征,冬季灰霾天数最多,人为排放、地形和天气为主要影响因素。PM2.5和PM10质量浓度具有良好的线性关系,相关系数为0.8771。颗粒物质量浓度郊区整体低于城区,城区相对郊区变化更为平稳,但郊区受扬尘影响程度高。

Comparative analysis of PM2.5 and PM10 variation characteristics between rural and urban areas in Mianyang City,China

Based on the characteristics of particulate matter(PM2.5 and PM10)pollution in Mianyang City,Sichuan Province,China,this study analyzed PM2.5 and PM10 mass concentrations in the urban and suburban areas of Mianyang from September 2017 to September 2018.The seasonal and daily changes in PM2.5 and PM10 as well as correlations between PM2.5 and PM10 are subsequently discussed,and the possible sources of pollution particles are explained.Furthermore,the daily change differences between urban and suburban areas are described.The results showed great seasonal differences in PM2.5 and PM10,with the most serious air pollution occurring in winter,followed by spring,autumn,and summer.The main influencing factors for the occurrence of pollution in winter were anthropogenic emissions,topography,and weather.A good linear relationship existed between PM2.5 and PM10 concentrations,with a correlation coefficient of 0.8771.The mass concentration of particulate matter in the suburban area was lower than that in the urban area,and the changes in the urban area were more stable than those in the suburban area.This study contributes to understanding of particulate matter pollution in typical cities in the Sichuan Basin.