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Title: Trends of ambient fine particles and major chemical components in the Pearl River Delta region : observation at a regional background site in fall and winter
Authors: Fu, XX
Wang, XM
Guo, H 
Cheung, KL
Ding, X
Zhao, XY
He, QF
Gao, B
Zhang, Z
Liu, TY
Zhang, YL
Keywords: PM2.5
Carbonaceous aerosols
Pearl River Delta
Issue Date: 2014
Publisher: Elsevier
Source: Science of the total environment, 2014, v. 497, p. 274-281 How to cite?
Journal: Science of the total environment 
Abstract: In the fall and winter of 2007 to 2011, 167 24-h quartz filter-based fine particle (PM2.5) samples were collected at a regional background site in the central Pearl River Delta. The PM2.5 showed an annual reduction trend with a rate of 8.58 mu g m(-3) (p < 0.01). The OC component of the PM2.5 reduced by 1.10 mu g m(-3) yr(-1) (p < 0.01), while the reduction rates of sulfur dioxide (SO2) and sulfate (SO42-) were 10.2 mu g m(-3) yr(-1) (p < 0.01) and 1.72 mu g m(-3) yr(-1) (p < 0.01), respectively. In contrast, nitrogen oxides (NOx) and nitrate (NO3-) presented growth trends with rates of 6.73 mu g m(-3) yr(-1) (p < 0.05) and 0.79 mu g m(-3) yr(-1) (p < 0.05), respectively. The PM2.5 reduction was mainly related to the decrease of primary OC and SO42-, and the enhanced conversion efficiency of SO2 to SO42- was related to an increase in the atmospheric oxidizing capacity and a decrease in aerosol acidity. The discrepancy between the annual trends of NOx and NO3- was attributable to the small proportion of NO3- in the total nitrogen budget. Capsule abstract: Understanding annual variations of PM2.5 and its chemical composition is crucial in enabling policymakers to formulate and implement control strategies on particulate pollution.
ISSN: 0048-9697
EISSN: 1879-1026
DOI: 10.1016/j.scitotenv.2014.08.008
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