U.S. Environmental Protection Agency “Our Nation’s Air” report, 2016

EPA Toxic Releases Inventory database (data dictionary here; 2015 national summary here); industry detail by year

Investigative Reporters and Editors & National Institute for Computer Assisted Reporting Federal Data Directory (“rescued” data at threat of removal from federal websites)

IRE update on EPA data

U.S. Environmental Protection Agency air emissions data

National Emissions Inventory, 2014, national summary