کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10110972 | 1620000 | 2005 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
PM2.5 chemical composition in Hong Kong: urban and regional variations
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Chemically speciated PM2.5 measurements were made at roadside, urban, and rural background sites in Hong Kong for 1 year during 2000/2001 to determine the spatial and temporal variations of PM2.5 mass and chemical composition in this highly populated region. Annual average PM2.5 concentrations at the urban and rural sites were 34.1 and 23.7 μg mâ3, respectively, â¼50-100% higher than the United States' annual average National Ambient Air Quality Standard (NAAQS) of 15 μg mâ3. Daily PM2.5 concentrations exceeded the U.S. 24-h NAAQS of 65 μg mâ3 on 19 days, reaching 131±8 μg mâ3 at the roadside site on 02/28/2001. Carbonaceous aerosol is the largest contributor to PM2.5 mass (explaining 52-75% of PM2.5 mass at the two urban sites and 32% at the background site), followed by ammonium sulfate (ranging from 23% to 37% at the two urban sites and 51% at the background site). Ammonium sulfate and crustal concentrations showed more uniform spatial distributions, while the largest urban-rural contrasts found in carbonaceous aerosol (likely due to emissions from on-road gasoline and diesel vehicles). Marine influences accounted for 7% of the mass at the background site (more than twice as much as at the two urban sites). Ternary diagrams are utilized to illustrate the different spatial patterns.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 338, Issue 3, 15 February 2005, Pages 267-281
Journal: Science of The Total Environment - Volume 338, Issue 3, 15 February 2005, Pages 267-281
نویسندگان
Peter K.K. Louie, Judith C. Chow, L.-W. Antony Chen, John G. Watson, Gordon Leung, Della W.M. Sin,