Charts and data for Indiaspend pieces on the state of air quality data in India.
http://www.indiaspend.com/cover-story/to-cut-delhis-air-pollution-pinpoint-the-source-40763 http://www.indiaspend.com/cover-story/how-to-pinpoint-delhis-air-pollution-sources-45985
Data on air quality monitor coverage was scraped from the CPCB portal: http://www.cpcb.gov.in/CAAQM/mapPage/frmindiamap.aspx
Data on source apportionment studies was taken from the EPoD memo authored by Raahil Madhok and Rohini Pande that can be found in sources/assets/data.