自贡市大气颗粒物污染特征及来源解析

摘要

Based on the atmospheric monitoring data in Zigong City and the meteorological data of the same period as well as the online monitoring data of source apportionment of atmospheric particles, the characteristics and causes of particles pollution were studied.The results showed that the floating dust weather had an significant effect on annual mean particle concentration, quarterly average concentration was higher in winter and lower in summer, monthly average concentration presented a "U" shape change, daily average concentration presented the characteristics of double peaks.There was a correlation between the precipitation, temperature, air pressure, wind speed and atmospheric particles, but have no correlation with the relative humidity, the change of concentration of PM10, CO, NO2, SO2 and O3 had significant effects on PM2.5.PM2.5 was mainly composed of organic carbon, potassium rich particles and other chemical components, its main sources were motor vehicle exhaust, coal-fired, industrial process, etc.%利用自贡市大气监测数据、同期气象数据以及颗粒物源解析在线监测资料,对颗粒物污染的特征及成因进行研究.结果表明:颗粒物年均浓度受浮尘天气影响明显,季均浓度呈冬高夏低变化,月均浓度呈"U"字形变化,日均浓度呈双峰型变化;颗粒物与降水、温度、气压、风速存在相关性,与相对湿度无相关性,PM10、CO、NO2、SO2、O3浓度对PM2.5浓度变化影响显著;PM2.5主要成分为元素碳、有机碳、富钾颗粒等,主要来源为机动车尾气、燃煤、工业工艺源等.