Concentration analysis of atmospheric particulate matter under typical spring weather condition in Chongqing

Key words: 
• particulate matter /
• mass concentration /
• number concentration /
• β-ray method /
• oscillation balance method

Abstract: 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.