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. 2015 Nov 9;5(11):e009169. doi: 10.1136/bmjopen-2015-009169

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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://www.bmj.com/company/products-services/rights-and-licensing/

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Seasonal trends of monthly average concentrations of air pollutants and monthly levels of climate factors (April 1999–March 2010). Left (right) column represents Calgary (Edmonton); while the top (bottom) row represents pollution (climate) levels. Unit of the monthly average concentrations of pollutants was adjusted: CO (1 unit=1 mg/m³); NO (1 unit=10 µg/m³); NO₂ (1 unit=10 µg/m³); O₃ (1 unit=10 µg/m³); PM_2.5, fine particulate matter (1 unit=10 µg/m³). Unit of the monthly average values of climate factors: TEMP, temperature (1 unit=1°C); DEWP, dew point temperature (1 unit=1°C); WDSP, wind speed (1 unit=0.1 knots).