کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5789250 | 1414305 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diurnal, seasonal, and spatial variation of PM2.5 in Beijing
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science Bulletin - Volume 60, Issue 3, February 2015, Pages 387-395
Journal: Science Bulletin - Volume 60, Issue 3, February 2015, Pages 387-395
نویسندگان
Runkui Li, Zhipeng Li, Wenju Gao, Wenjun Ding, Qun Xu, Xianfeng Song,