Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5789250 | Science Bulletin | 2015 | 9 Pages |
Abstract
PM2.5 pollution in Beijing has attracted extensive attention in recent years, but research on the detailed spatiotemporal characteristics of PM2.5 is critically lacking for effective pollution control. In our study, hourly PM2.5 concentration data of 35 fixed monitoring sites in Beijing were collected continuously from October 2012 to September 2013, for exploring the diurnal and seasonal characteristics of PM2.5 at traffic, urban, and background environments. Spatial trend and regional contribution of PM2.5 under different pollution levels were also investigated. Results show that the average PM2.5 concentration of all the 35 sites (including 5 traffic sites) was 88.6 μg/m3. Although PM2.5 varied largely with the site location and seasons, a clear spatial trend could be observed with the PM2.5 concentration decreasing linearly from south to north, with a gradient of â0.46 μg/m3/km for average days, â0.83 μg/m3/km for heavily-severely polluted days, â0.52 μg/m3/km at lightly-moderately polluted days, and â0.26 μg/m3/km for excellent-good days. PM2.5 at traffic sites was varied, but was generally over 10% higher than at the nearby urban assessment sites.
Related Topics
Physical Sciences and Engineering
Chemistry
Chemistry (General)
Authors
Runkui Li, Zhipeng Li, Wenju Gao, Wenjun Ding, Qun Xu, Xianfeng Song,