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. 2022 Aug 13;52(2):e137–e151. doi: 10.1093/ije/dyac156

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© The Author(s) 2022; all rights reserved. Published by Oxford University Press on behalf of the International Epidemiological Association

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Distribution of the measures of O₃, PM_2.5, night-time light and greenness. From (a) to (d) are ozone (O₃), fine particulate matter (PM_2.5), night-time light and greenness, respectively. The left panel for each subfigure is the annual average concentrations for all of Canada (source: canuedata.ca/map.php), in which the filled circles in different colours are quintiles of the distribution. The right panel for each subfigure is the frequency distribution (%) in the Ontario Health Study (OHS)