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OSPM: Comparison between modelled results obtained for the Erzeijstraat in the Netherlands and measurements
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Series / Report no.
RIVM report 680705011
Open Access
Type
Report
Language
en
Date
2009-03-17
Research Projects
Organizational Units
Journal Issue
Title
OSPM: Comparison between modelled results obtained
for the Erzeijstraat in the Netherlands and
measurements
Translated Title
OSPM: een vergelijking tussen berekende resultaten
en metingen in de Erzeijstraat in Nederland
Published in
Abstract
Het RIVM heeft een Deens model om luchtkwaliteit in
straten te berekenen, OSPM (Operational Street Pollution Model), vergeleken
met metingen van het Landelijk Meetnet Luchtkwaliteit (LML) en berekeningen
met het Nederlandse CAR II-model. De berekende jaargemiddelde concentraties
komen redelijk goed overeen met zowel de LML-metingen als de CAR
II-berekeningen. De verschillen tussen de voor individuele uren berekende
en gemeten concentraties zijn echter groot. In dit onderzoek gaat het om de
concentraties stikstofdioxide en stikstofoxiden in de Erzeijstraat in
Utrecht in de jaren 2002, 2003 en 2006.
Lokale overheden gebruiken CAR II (Calculation of Air pollution from
Roadtraffic) om de luchtkwaliteit in situaties met veel verkeer te
berekenen. Uit onderzoek van het RIVM in 2007 is gebleken dat de berekende
jaargemiddelden van CAR-II redelijk goed overeenkomen met metingen. Het is
echter niet mogelijk om met behulp van CAR-II concentraties per uur te
berekenen. Dat kan wel met OSPM, dat complexer en gedetailleerder is. Dit
model is met succes uitgebreid getest in Denemarken.
De met OSPM berekende jaargemiddelde concentraties stikstofdioxide liggen
een tot twee microgram per kubieke meter lager dan metingen. In dit opzicht
is OSPM vergelijkbaar met CAR-II. De correlatie tussen voor individuele
uren berekende concentraties en metingen is voor de totale concentraties
(omgeving plus bijdrage van de weg) goed, maar voor de verkeersbijdragen
hooguit redelijk te noemen. Een gebrek aan lokale meteorologische gegevens
is waarschijnlijk de belangrijkste factor voor het verschil. Daarnaast kon
de invloed van verkeer op nabij gelegen (snel)wegen niet in het model worden
meegenomen.
RIVM has compared the results obtained with a Danish model for the calculation of air quality in streets, the OSPM (Operational Street Pollution Model), with measurements of the Dutch National Air Quality Monitoring Network (LML) and the calculations performed using the Dutch CAR-II (Calculation of Air pollution from Road traffic) model. The yearly average concentrations calculated using the OSPM are in reasonably good agreement with both the measurements and the calculations performed using CAR-II. However, there is a large scatter between the calculated and measured hourly concentrations. In the study reported here, the OSPM was used to calculate the NOx and NO2 concentrations in the Erzeijstraat in Utrecht, which is a good example of a typical Dutch street canyon. Calculations were performed for 2002, 2003 and 2006. Dutch municipalities use the CAR-II model to estimate local air quality in streets with traffic. Research by the RIVM in 2007 demonstrated that the annual concentrations calculated by CAR-II are in fairly good agreement with measurements. However, it is not possible to calculate hourly concentrations using the CAR-II model. Hourly concentrations can be calculated using the OSPM model, which is a more sophisticated and detailed model. This model has been tested successfully in Denmark. The yearly average concentrations of NO2, as calculated using the OSPM, were found to be one to two micrograms per cubic meter lower than the measured values. This result is comparable to that obtained using CAR-II. There is a good correlation between modelled total hourly concentrations and measured total hourly concentrations (background plus contribution from the traffic), but only a moderate correlation for modelled and measured street increment. The lack of accurate meteorological data is probably the main factor contributing to this latter result. There were also contributions from nearby roads and highways, but these can not be incorporated in the OSPM.
RIVM has compared the results obtained with a Danish model for the calculation of air quality in streets, the OSPM (Operational Street Pollution Model), with measurements of the Dutch National Air Quality Monitoring Network (LML) and the calculations performed using the Dutch CAR-II (Calculation of Air pollution from Road traffic) model. The yearly average concentrations calculated using the OSPM are in reasonably good agreement with both the measurements and the calculations performed using CAR-II. However, there is a large scatter between the calculated and measured hourly concentrations. In the study reported here, the OSPM was used to calculate the NOx and NO2 concentrations in the Erzeijstraat in Utrecht, which is a good example of a typical Dutch street canyon. Calculations were performed for 2002, 2003 and 2006. Dutch municipalities use the CAR-II model to estimate local air quality in streets with traffic. Research by the RIVM in 2007 demonstrated that the annual concentrations calculated by CAR-II are in fairly good agreement with measurements. However, it is not possible to calculate hourly concentrations using the CAR-II model. Hourly concentrations can be calculated using the OSPM model, which is a more sophisticated and detailed model. This model has been tested successfully in Denmark. The yearly average concentrations of NO2, as calculated using the OSPM, were found to be one to two micrograms per cubic meter lower than the measured values. This result is comparable to that obtained using CAR-II. There is a good correlation between modelled total hourly concentrations and measured total hourly concentrations (background plus contribution from the traffic), but only a moderate correlation for modelled and measured street increment. The lack of accurate meteorological data is probably the main factor contributing to this latter result. There were also contributions from nearby roads and highways, but these can not be incorporated in the OSPM.
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