Spatial distributions of nitrogen dioxide in an urban area.

Hewitt, CN (1992) Spatial distributions of nitrogen dioxide in an urban area. Atmospheric Environment. Part B. Urban Atmosphere, 25 (3). pp. 429-434.

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Fortnightly average NO2 concentrations have been measured at 49 sites in the small city of Lancaster, U.K., over a continuous 1-year period using passive diffusion tubes. At sampling sites on a congested main road in the city centre considerable spatial and temporal variability in concentrations was found. An annual mean concentration of 63 μgm−3 was found witha range of 12–222 μgm−3. The mean concentration in an adjacent main road was 58 μgm−3 with a range of 5–107 μgm−3. Rather less variability was seen in a suburban main road and in a suburban residential street, which had annual mean concentrations of 38 and 30 μm−3, respectively. Concentrations in a city centre pedestrian precinct decreased with distance from the main road, having an annual mean value of 30μm−3. The data suggest that the precise location of a sampling device may be crucial in determining whether or not a given NO2, concentration or standard is exceeded.

Item Type:
Journal Article
Journal or Publication Title:
Atmospheric Environment. Part B. Urban Atmosphere
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13 Jan 2009 09:52
Last Modified:
21 Nov 2022 19:07