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| Titel |
The impacts of firework burning at the Chinese Spring Festival on air quality: insights of tracers, source evolution and aging processes |
| VerfasserIn |
S. F. Kong, L. Li, X. X. Li, Y. Yin, K. Chen, D. T. Liu, L. Yuan, Y. J. Zhang, Y. P. Shan, Y. Q. Ji |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 4 ; Nr. 15, no. 4 (2015-02-27), S.2167-2184 |
| Datensatznummer |
250119466
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| Publikation (Nr.) |
 copernicus.org/acp-15-2167-2015.pdf |
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| Zusammenfassung |
| To understand the impact of firework-burning (FW) particles on air quality
and human health during the winter haze period, 39 elements, 10
water-soluble ions and 8 fractions of carbonaceous species in
atmospheric PM2.5 in Nanjing were investigated during the 2014 Chinese
Spring Festival (SF). Serious regional haze pollution persisted throughout
the entire sampling period, with PM2.5 averaging at
113 ± 69 μg m−3 and visibility at 4.8 ± 3.2 km. The holiday effect
led to almost all the chemical species decreasing during the SF, except for
Al, K, Ba and Sr which were related to FW. The source contributions of coal
combustion, vehicle emission and road dust decreased dramatically, whereas
FW contributed to about half of the PM2.5 during the SF period. The
intensive emission of FW particles on New Year's Eve accounted for 60.1%
of the PM2.5. Fireworks also obviously modified the chemical
compositions of PM2.5, with 39.3% contributed by increased organic
matter, followed by steadily increased loadings of secondary inorganic ions.
The aging processes of the FW particles lasted for about 4 days reflected
by the variations of Ba, Sr, NH4+, NO3−, SO42−
and K+, characterized by heterogeneous reactions of SO2 and
NOx on crustal materials directly from FW, the replacement of Cl−
by NO3− and SO42−, coating of NO3− and
SO42− on soot, formation of secondary organic aerosols
and metal-catalyzed formation of NO3− and SO42− at
higher relative humidity. During aging, the main contributors to the
extinction coefficient shifted from elemental carbon and organic matter to
ammonium sulfate. The particles raised higher cancer risk of 1.62 × 10−6 by heavy metals (especially for Cd and As). This study provided
detailed composition data and first comprehensive analysis of the aging
processes of FW particles during the serious haze pollution period and their
potential impact on human health. |
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