Concentration analysis of atmospheric particulate matter under typical spring weather condition in Chongqing
重庆主城区春季典型天气的大气颗粒物浓度变化分析

Using the real-time monitoring data of atmospheric particulate matter under typical weather at the atmosphere observation super station of Chongqing in spring 2010,a comparison of PM10 monitoring data from two methods: β-ray absorption and micro-libration(TEOM) was made.Then concentration correlation of PM10,PM2.5 and PM1 was analyzed,and the number concentration as a function of distribution of particles smaller than 10 μm was investigated.The results showed that PM10 monitoring data from two methods-β-ray absorption and TEOM were in well agreement,and the former was 5.4% lower than TEOM.Number concentration of PM2.5,PM1 and PM0.5 accounted for more than 98% of PM10.Average number concentration of PM0.25 accounted for 34.9% of PM10 and accounted for 35.1% of PM1.24 hours’ average mass concentration of PM2.5 accounted for 51.2% of PM10 monitored by TEOM.By β-ray absorption method,24 hours’ average mass concentration of PM2.5 and PM1 accounted for 56.9% and 30.9% of PM10,respectively.