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SW: →External links: - add external link
=== External links ===
*[http://www.stateoftheair.org/2011/city-rankings/most-polluted-cities.html "Most Polluted Cities: Ozone and Particulate Matter"] American Lung Association, 2011
* C.B. Szpunar, [http://www.osti.gov/bridge/servlets/purl/6869555-Cxdk4K/6869555.pdf "Air Toxic Emissions from the Combustion of Coal: Identifying and Quantifying Hazardous Air Pollutants from U.S. Coals,"] U.S. Department of Energy, ANL/EAIS/TM-83, September 1992
[[Category:Environmental issues of coal]]
