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| Titel |
Possible impact of increased fraction of NO2-emissions due to road traffic on air pollutant concentration in Central Europe and North-Rhine Westphalia |
| VerfasserIn |
Michael Memmesheimer, Hermann J. Jakobs, Sabine Wurzler, Heike Hebbinghaus, Elmar Friese, Georg Piekorz, Christoph Kessler, Adolf Ebel |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250040042
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| Zusammenfassung |
| Reduction of total NOx-emissions is one of the major objectives of the current European legislative standards in particular with respect to road traffic. Air quality regulations as formulated in the air quality directive 2008/50/EC however are aiming on NO2 and not on total NOx (NO+NO2). With respect to NO2-concentrations two limit values have to be fulfilled for the year 2010: an annual mean value of 40 µg/m3 and an hourly value of 200 µg/m3 with 18 permitted exceedences per year. Near roadside measurement sites quite often show annual values higher than 40 µg/m3. During recent years very often no tendency for a further decrease of NO2-concentrations could be seen even though the total NOx-emissions clearly have decreased. This might be due to the increase of the fraction of NO2 (f-NO2) in the vehicle’s total NOx-emissions due to exhaust treatment technology aiming on a reduction of NOx and not of NO2. To investigate the impact of an increased f(NO2) several model simulations with the complex three-dimensional chemical transport model EURAD have been performed. The numerical calculations cover the European scale as well as the urban background scale with horizontal grid resolution down to 5 km. The results show the expected increase of NO2-concentrations in ambient air if f(NO2) is increased and total NOx has been held constant. However, it could clearly be seen that also the ozone concentrations as well as particulate matter (PM10) show an increase. With respect to PM10 the number of exceedences of the daily limit value of 50 µg/m3 increased with increasing f(NO2). |
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