Fig. 1From: Risk estimates of mortality attributed to low concentrations of ambient fine particulate matter in the Canadian community health survey cohortMap of mean PM2.5 estimates in Canada from 1998–2010 derived from satellite. imagery at 1 km2 resolution. Cities with populations greater than 1 million (in the metropolitan area) are indicated. All of these large city PM2.5 exposures were >8 ug/m3. Insets: detailed PM2.5 estimates in southern Ontario, Toronto, Ottawa, Montreal, Vancouver, Edmonton, and CalgaryBack to article page