NavGeneral InfoEmail Print Geography Mexico (MEX) United States of America (USA) Puerto Rico, United States Virgin Islands Coverage type Country Time period covered 01/2012 - 12/2012 Series or system United States Air Quality System Data type Environmental monitoring Summary Similar data are available through the Air Quality System (AQS) website. Keywords Particulate matter, Urban ambient air pollution Citation Contributors United States Environmental Protection Agency Suggested citation United States Environmental Protection Agency. United States Air Quality System Data 2012. GHDx Entry last modified on: Aug 24, 2020