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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, X Wang, X Guo, H Cheung, K Ding, X Zhao, X He, Q Gao, B Zhang, Z Liu, T Zhang, Y |
Issue Date: | 1-Nov-2014 | Source: | Science of the total environment, 1 Nov. 2014, v. 497-498, p. 274-281 | 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 8.58μgm-3 (p < 0.01). The OC component of the PM2.5 reduced by 1.10μgm-3yr-1 (p < 0.01), while the reduction rates of sulfur dioxide (SO2) and sulfate (SO42-) were 10.2μgm-3yr-1 (p < 0.01) and 1.72μgm-3yr-1 (p < 0.01), respectively. In contrast, nitrogen oxides (NOx) and nitrate (NO3-) presented growth trends with rates of 6.73μgm-3yr-1 (p < 0.05) and 0.79μgm-3yr-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. |
Keywords: | Carbonaceous aerosols Nitrate Pearl River Delta PM2.5 Sulfate |
Publisher: | Elsevier | Journal: | Science of the total environment | ISSN: | 0048-9697 | EISSN: | 1879-1026 | DOI: | 10.1016/j.scitotenv.2014.08.008 | Rights: | © 2014 Elsevier B.V. All rights reserved. © 2014. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ The following publication Fu, X., Wang, X., Guo, H., Cheung, K., Ding, X., Zhao, X., ... & Zhang, Y. (2014). 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. Science of the total environment, 497, 274-281. is available at https://doi.org/10.1016/j.scitotenv.2014.08.008. |
Appears in Collections: | Journal/Magazine Article |
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