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Interannual variation of air quality across an international airshed in Detroit (USA) and Windsor (Canada): A comparison of two sampling campaigns in both cities

Miller, L, Xu, X, Lemke, LD and Wheeler, AJ ORCID: 0000-0001-9288-8163 2019 , 'Interannual variation of air quality across an international airshed in Detroit (USA) and Windsor (Canada): A comparison of two sampling campaigns in both cities' , Atmospheric Environment, vol. 198 , pp. 417-426 , doi: 10.1016/j.atmosenv.2018.11.017.

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This study investigates air pollutant concentrations across the international airshed spanning Detroit, Michigan,USA and Windsor, Ontario, Canada. The Geospatial Determinants of Health Outcomes Consortium (GeoDHOC)measured air quality concurrently in Detroit and Windsor using consistent sampling methods and locationsduring separate, two-week periods in September 2008 and May/June 2009. This paper presents 2009 results andcompares them to previously reported 2008 campaign results to assess spatial and temporal variability. A high densityarray of 100 passive and 50 active samplers was used to measure nitrogen dioxide (NO2), 26 volatileorganic compounds (VOCs), 23 polycyclic aromatic hydrocarbons (PAHs), and three size fractions of particulatematter (PM) in both campaigns. Geospatial and non-spatial tools were used to investigate changes in concentrationdistributions and site classification into low/medium/high tertiles between the campaigns. During thetwo-week 2009 campaign, general pollution patterns remained consistent with those observed during 2008.Higher concentrations in Detroit, strong correlations amongst the BTEX group, and consistency of sites fallinginto the low and high tertiles were observed. Similar spatial patterns for NO2, VOCs, BTEX, and PAHs were alsofound during both campaigns. Conversely, PM1-2.5 and PM2.5-10 distributions showed greater variability, as didtoluene/benzene ratios. Observed differences are attributable to changes in point source emissions associatedwith changes in localized activities, possibly related to decreased economic and industrial activity in response tothe downturn that began in late 2008. Repeated sampling at multiple locations is important to determine spatialand temporal variability in absolute concentrations. However, if the definition of relatively high and low concentrationsregions within a well-established urban area is adequate to estimate future air pollutant exposures, asingle multi-location campaign may suffice.

Item Type: Article
Authors/Creators:Miller, L and Xu, X and Lemke, LD and Wheeler, AJ
Keywords: air quality, international airshed, temporal variability, spatial variability, multi-pollutants
Journal or Publication Title: Atmospheric Environment
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 1352-2310
DOI / ID Number: 10.1016/j.atmosenv.2018.11.017
Copyright Information:

Crown Copyright © 2018 Published by Elsevier Ltd. All rights reserved.

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