Within-City Spatial Variations in Multiple Measures of PM2.5 Oxidative Potential in Toronto, Canada.

07:00 EST 8th February 2019 | BioPortfolio

Summary of "Within-City Spatial Variations in Multiple Measures of PM2.5 Oxidative Potential in Toronto, Canada."

Few studies have characterized within-city spatial variations in the oxidative potential of fine particulate air pollution (PM2.5). In this study, we evaluated multiple measures of PM2.5 oxidative potential across Toronto, Canada (2016-2017) including glutathione/ascorbate-related oxidative potential (OPGSH and OPAA) and dithiothreitol depletion (OPDTT). Integrated 2-week samples were collected from 67 sites in summer and 42 sites in winter. Multivariable linear models were developed to predict OP based on various land use/traffic factors and PM2.5 metals and black carbon were also examined. All three measures of PM2.5 oxidative potential varied substantially across Toronto. OPAA and OPDTT were primarily associated with traffic-related components of PM2.5 (i.e. Fe, Cu, and black carbon) whereas OPGSH was not a strong marker for traffic during either season. During summer, multivariable models performed best for OPAA (R2CV=0.48) followed by OPDTT (R2CV=0.32) and OPGSH (R2CV=0.22). During winter, model performance was best for OPDTT (R2CV=0.55) followed by OPGSH (R2CV=0.50) and OPAA (R2CV=0.23). Model parameters varied between seasons and between-season differences in PM2.5 mass concentrations were weakly/moderately correlated with seasonal differences in OP. Our findings highlight substantial within-city variations in PM2.5 oxidative potential. More detailed information is needed on local sources of air pollution to improve model performance.


Journal Details

This article was published in the following journal.

Name: Environmental science & technology
ISSN: 1520-5851


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