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Journal Article

Citation

Cowie CT, Rose N, Gillett R, Walter S, Marks GB. Environ. Sci. Technol. 2012; 46(5): 2918-2927.

Copyright

(Copyright © 2012, American Chemical Society)

DOI

10.1021/es202686r

PMID

22289123

Abstract

The aim of this study was to assess the effect of a new road tunnel on the concentration and distribution of traffic related air pollution (TRAP), specifically nitrogen dioxide (NO2) and particulate matter (PM), and to determine its relationship to change in traffic flow. We used continuously recorded data from four monitoring stations at non-roadside locations within the study area and three regional monitors outside the area. The four monitors in the study area were in background locations where smaller pollutant changes were expected compared with changes near the main bypassed road. We also deployed passive samplers to assess finer spatial variability in NO2 including application of a land use regression model (LUR). The study was conducted from 2006-2008. Analysis of the continuously recorded data showed that the tunnel intervention did not lead to consistent reductions in NO2 or PM over the wider study area. However there were significant decreases in NO2, NOx and PM10 in the eastern section of the study area. Analysis of passive sampler data indicated that the greatest reductions in NO2concentrations occurred within 100 metres of the by-passed main road. The LUR model also demonstrated that changes in NO2 were most marked adjacent to the by-passed main road. These findings support the use of methods that highlight fine spatial variability in TRAP and demonstrate the utility of traffic interventions in reducing air pollution exposures for populations living close to main roads.


Language: en

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