| Description | Organization | URL |
|---|---|---|
| WHO Air Quality Database | World Health Organization | www.who.int |
| GDP (US$) | World Bank | data.worldbank.org |
| Population | World Bank | data.worldbank.org |
| GHG Emissions | Climate Watch | www.climatewatchdata.org |
| Country Data | University of Notre Dame | www3.nd.edu |
Image sources: American University, CNBC, CNN, Copernicus, Health Affairs, IQAir, KLTA, New York Times, NWS, Reuters, World Meteorological Organization