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. 2015 Sep 2;5(9):e009075. doi: 10.1136/bmjopen-2015-009075

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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Risk* of health services use by pollutants on day 0 of exposure: AQHI, NO₂, PM_2.5 and O₃. * The Rate Ratios were obtained from Poisson Regressions and these correspond to increase/decrease in risk of the respective health services use per unit increase in AQHI and per 10-unit increase in each of NO₂, PM_2.5 and O₃. All Rate Ratios were adjusted for age groups, sex, day of the week, temperature, seasons, years, Local Health Integration Network and income quintiles. Error bars represent 95% CIs.