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- W582194940 abstract "Due to the underestimation of concentrations of nitrogen dioxide (NO2) and particulate matter (PM10) at three different roadside monitoring sites for previous air quality assessments (compared to measured data) as commissioned by the London Borough of Brent, the Transport Research Laboratory (TRL) reassessed the air quality at two of the three original sites, as presented in this report. These two sites were Harlesden town centre and the A406 junction with Brentfield Road. (Wembley town centre was the third original site and was not reassessed.) A combination of site-specific and generic reasons were considered to be the cause of the underestimation; for example, in the model setup there were limitations of emissions factors to represent traffic queuing. The objective of the reassessment was decide whether using emission rates derived from recording transient vehicle operations is more representative than using emission rates derived from average speed functions. It was shown by the results that by using the average-speed emissions approach, the model had under-predicted the road contribution to nitrogen oxide (NOx) and PM10 at both sites. For the Harlesden site, using the instantaneous emissions approach in the model over-predicted the road contribution of NOx, as well as slightly over-predicting the road contribution of PM10. At the A406 sites, using instantaneous emissions in the model resulted in slightly under-predicting the road contribution of NOx, as well as under-predicting the road contribution of PM10. In order to understand the robustness of background contributions, further work is needed. The instantaneous emission approach to assessing air quality should, overall, theoretically offer an improvement over average-speed emissions calculations, as it has shown itself to be appropriate for air quality assessment." @default.
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- W582194940 date "2011-11-01" @default.
- W582194940 modified "2023-09-24" @default.
- W582194940 title "Air Quality Assessment: Harlesden Town Centre and A406 Junction with Brentfield Road" @default.
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