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| Titel |
Analysis of exceedances in the daily PM10 mass concentration (50 μg m−3) at a roadside station in Leipzig, Germany |
| VerfasserIn |
C. Engler, W. Birmili, G. Spindler, A. Wiedensohler |
| 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 ; 12, no. 21 ; Nr. 12, no. 21 (2012-11-05), S.10107-10123 |
| Datensatznummer |
250011556
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| Publikation (Nr.) |
 copernicus.org/acp-12-10107-2012.pdf |
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| Zusammenfassung |
| Five years of PM10 and PM2.5 ambient air measurements at a
roadside, an urban, and a regional background site in Leipzig (Germany) were
analyzed for violations of the legal PM10 limit value (EC, 1999). The
annual mean PM10 concentrations at the three sites were well below the
legal threshold of 40 μg m−3 (32.6, 22.0 and
21.7 μg m−3, respectively). At roadside, the daily maximum
value of 50 μg m−3 was exceeded on 232 days (13% of all
days) in 2005–2009, which led to a violation of the EC directive in three
out of five years. We analysed the meteorological factors and local source
contributions that eventually led to the exceedances of the daily limit
value. As noted in other urban environments before, most exceedance days were
observed in the cold season. Exceedance days were most probable under
synoptic situations characterised by stagnant winds, low temperatures and
strong temperature inversions in winter time. However, these extreme
situations accounted for only less than half of the exeedance days. We also
noticed a significant number of exceedance days that occurred in the cold
season under south-westerly winds, and in the warm season in the presence of
easterly winds. Our analysis suggests that local as well as regional sources
of PM are equally responsible for exceedances days at the roadside site. The
conclusion is that a combined effort of local, national and international
reduction measures appears most likely to avoid systematic exceedances of the
daily limit value in the future. |
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