Mass Concentration of Particles (PM10) in Urban Environment of Changsha,China

Continuous measurement of ambient PM10 was performed by TEOM at a university campus for about one year from 20 November 2007 to 29 October 2008 in Changsha city of Hunan province.Indoor PM10 and PM2.5 concentration were measured by DustTrak simultaneously in order to describe the difference in concentration level and daily variations of particle mass concentration between different seasons,and to survey the influence of ambient particle on indoor air quality.During the survey period,the annual average PM10 concentration was found to be 117.63 μg/m3,with a mean value 121.88 μg/m3 in winter and 111.50 μg/m3 in spring.The temporal trend changed quickly from time to time,and the peak values were found in rush hours and in the evening.Ambient PM10 showed a good correlation with indoor PM10 and outdoor PM2.5 but not with indoor PM2.5.These results showed that PM10 was influenced by local source(such as traffic or fuel burning)and regional source.The correlation analysis has shown that ambient PM10 contributes substantial fraction to indoor PM10 but not to indoor PM2.5,which indicates other source may exist in the indoor environment.