Fig. 1From: Study on PM2.5 pollution and the mortality due to lung cancer in China based on geographic weighted regression modelAverage PM2.5 concentration for each province in China from 2004 to 2008. The map was drawn by the authors with ArcGIS software (a geographic information system for working with maps and geographic information) based the PM2.5 concentration data extracted at http://sedac.ciesin.columbia.edu/data/sets/browseBack to article page