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| Titel |
Modelling NO2 concentrations at the street level in the GAINS integrated assessment model: projections under current legislation |
| VerfasserIn |
G. Kiesewetter, J. Borken-Kleefeld, W. Schöpp, C. Heyes, P. Thunis, B. Bessagnet, E. Terrenoire, A. Gsella, M. Amann |
| 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 ; 14, no. 2 ; Nr. 14, no. 2 (2014-01-24), S.813-829 |
| Datensatznummer |
250118307
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| Publikation (Nr.) |
 copernicus.org/acp-14-813-2014.pdf |
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| Zusammenfassung |
| NO2 concentrations at the street level are a major concern for urban air
quality in Europe and have been regulated under the EU Thematic Strategy on
Air Pollution. Despite the legal requirements, limit values are exceeded at
many monitoring stations with little or no improvement in recent years.
In order to assess the effects of future emission control regulations on
roadside NO2 concentrations, a downscaling module has been implemented in
the GAINS integrated assessment model. The module follows a hybrid approach
based on atmospheric dispersion calculations and observations from the
AirBase European air quality database that are used to estimate
site-specific parameters. Pollutant concentrations at every monitoring site
with sufficient data coverage are disaggregated into contributions from
regional background, urban increment, and local roadside increment. The
future evolution of each contribution is assessed with a model of the
appropriate scale: 28 × 28 km grid based on the EMEP Model for
the regional background, 7 × 7 km urban increment based on the
CHIMERE Chemistry Transport Model, and a chemical box model for the roadside
increment. Thus, different emission scenarios and control options for
long-range transport as well as regional and local emissions can be analysed. Observed
concentrations and historical trends are well captured, in particular the
differing NO2 and total NOx = NO + NO2 trends.
Altogether, more than 1950 air quality monitoring stations in the EU are
covered by the model, including more than 400 traffic stations and 70%
of the critical stations. Together with its well-established bottom-up
emission and dispersion calculation scheme, GAINS is thus able to bridge the
scales from European-wide policies to impacts in street canyons. As an
application of the model, we assess the evolution of attainment of NO2
limit values under current legislation until 2030. Strong improvements are
expected with the introduction of the Euro 6 emission standard for light duty
vehicles; however, for some major European cities, further measures may be
required, in particular if aiming to achieve compliance at an earlier time. |
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