Volume 10, No. 6, December 2010, Pages 550-558 PDF(1.05 MB)
The Indoor and Outdoor Carbonaceous Pollution during Winter and Summer in Rural Areas of Shaanxi, China
Chong-Shu Zhu1,2, Jun-Ji Cao1,3, Chuen-Jinn Tsai2, Zhen-Xing Shen3, Kin-Fai Ho4, Sui-Xin Liu1
1 SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China
2 Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan
3 Department of Environmental Science & Technology, Xi'an Jiaotong University, Xi'an, China
4 Department of Civil & Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Indoor and outdoor concentrations of PM2.5, OC, EC and BC were investigated at three rural sites during the winter of 2007 and the summer of 2008 in Shaanxi, China. The average indoor concentrations of PM2.5, OC, EC and BC were found to be higher in winter (237.2 µg/m3, 61.1 µg/m3, 6.2 µg/m3, and 14.3 µg/m3, respectively) than in summer (99.0 µg/m3, 18.0 µg/m3, 2.8 µg/m3, and 7.4 µg/m3, respectively). The average indoor/outdoor (I/O) ratios for PM2.5 and EC were close to or less than 1.0 and those for OC and BC were above 1.0. The correlation coefficients of PM2.5 and carbon species also indicated that the indoor concentrations of PM2.5 and carbonaceous aerosol were correlated with the corresponding outdoor concentrations. Average OC/EC ratios ranged from 4.6 to 23.6 with an average of 9.1 during winter and from 4.2 to 12.0 with an average of 6.3 during summer. The results of this study showed that the OC and EC concentrations and OC/EC ratios in rural areas were higher than those of an urban area in Xi’an. These findings showed that improving energy efficiency and structure will be very important in reducing emissions in rural areas of Shaanxi.
PM2.5; Organic carbon; Elemental carbon; Rural areas.