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Do Urban Canyons Influence Street Level Grass Pollen Concentrations

Peel, Robert and Kennedy, Roy and Smith, Matt and Hertel, O. (2013) Do Urban Canyons Influence Street Level Grass Pollen Concentrations. International Journal of Biometeorology, 58 (6). pp. 1317-1325. ISSN Print: 0020-7128 Online: 1432-1254

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Abstract

In epidemiological studies, outdoor exposure to pollen is typically estimated using rooftop monitoring station data, whilst exposure overwhelmingly occurs at street level. In this study the relationship between street level and roof level grass pollen concentrations was investigated for city centre street canyon environments in Aarhus, Denmark, and London, UK, during the grass pollen seasons of 2010 and 2011 respectively. For the period mid-day to late evening, street level concentrations in both cities tended to be lower than roof-level concentrations, though this difference was found to be statistically significant only in London. The ratio of street/roof level concentrations was compared with temperature, relative humidity, wind speed and direction, and solar radiation. Results indicated that the concentration ratio responds to wind direction with respect to relative canyon orientation and local source distribution. In the London study, an increase in relative humidity was linked to a significant decrease in street/roof level concentration ratio, and a possible causative mechanism involving moisture mediated pollen grain buoyancy is proposed. Relationships with the other weather variables were not found to be significant in either location. These results suggest a tendency for monitoring station data to overestimate exposure in the canyon environment.

Item Type: Article
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Originally deposited as National Pollen and Aerobiology Research Unit (NPARU)

Uncontrolled Keywords: street level, roof level, grass pollen concentrations, canyon orientation
Subjects: S Agriculture > SB Plant culture
Divisions: Academic Departments > Institute of Science and the Environment
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Depositing User: Sally Wall
Date Deposited: 30 Sep 2013 15:28
Last Modified: 04 Jan 2017 12:23
URI: https://eprints.worc.ac.uk/id/eprint/2414

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