EPA Air (ICIS-AIR)
Stationary sources of air pollution
Every facility EPA’s Integrated Compliance Information System for Air tracks as a stationary source -- from large industrial plants to dry cleaners -- with its state, county, primary industry code, and its Clean Air Act emissions classification.
- 189,562Facilities
- 55States
By emissions classification
Major, synthetic minor, and minor sources, as ICIS-AIR classifies them under the Clean Air Act.
- Major source13,670
- Synthetic minor source27,419
- Minor source140,746
- Emissions classification unknown1,698
- Other1,073
- Not applicable1,195
By state
- Alabama1,901
- Alaska511
- Arizona485
- Arkansas1,393
- California2,144
- Colorado19,203
- Connecticut2,703
- Delaware291
- District of Columbia361
- Florida3,097
- Georgia4,074
- Hawaii102
- Idaho1,205
- Illinois14,433
- Indiana1,750
- Iowa4,820
- Kansas4,934
- Kentucky690
- Louisiana8,776
- Maine755
- Maryland9,831
- Massachusetts4,334
- Michigan2,916
- Minnesota2,433
- Mississippi1,027
- Missouri4,600
- Montana167
- Nebraska4,757
- Nevada218
- New Hampshire1,272
- New Jersey6,578
- New Mexico6,190
- New York11,896
- North Carolina2,730
- North Dakota900
- Ohio7,478
- Oklahoma16,337
- Oregon193
- Pennsylvania8,754
- Rhode Island519
- South Carolina2,110
- South Dakota275
- Tennessee2,519
- Texas6,422
- Utah618
- Vermont235
- Virginia6,804
- Washington639
- West Virginia1,021
- Wisconsin820
- Wyoming687
- Puerto Rico487
- U.S. Virgin Islands122
- Guam34
- Northern Mariana Islands11
Major sources in nonattainment areas, by state
States with at least one stationary source in a county EPA has designated as not meeting a National Ambient Air Quality Standard (NAAQS), per EPA’s Green Book.
- Alabama473
- Alaska98
- Arizona398
- Arkansas61
- California2,055
- Colorado12,716
- Connecticut2,677
- Delaware291
- District of Columbia360
- Florida1,265
- Georgia1,939
- Idaho404
- Illinois8,772
- Indiana1,111
- Iowa163
- Kansas476
- Kentucky307
- Louisiana1,949
- Maine648
- Maryland6,437
- Massachusetts4,327
- Michigan1,907
- Minnesota1,182
- Mississippi21
- Missouri1,581
- Montana84
- Nebraska734
- Nevada121
- New Hampshire992
- New Jersey5,872
- New Mexico1,474
- New York10,283
- North Carolina1,256
- Ohio5,689
- Oregon101
- Pennsylvania7,801
- Rhode Island506
- South Carolina129
- Tennessee1,345
- Texas3,101
- Utah535
- Virginia2,043
- Washington419
- West Virginia345
- Wisconsin308
- Wyoming198
- Guam26
What has happened at these sources, year by year
Compliance evaluations, high-priority Clean Air Act violations and stack tests recorded since 2017 — the same events, counted by state, by county and by industry underneath each year.
Air-emissions inspections
A compliance evaluation is the on-site or file review a state, local or federal air agency records against a permitted source.
High-priority air violations
A high-priority violation is the most serious class of Clean Air Act non-compliance an agency records against a source; a federally reportable violation is the next tier below it.
Air-emissions stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
Facility, location and classification figures from EPA’s ICIS-AIR download. Nonattainment designations from EPA’s Green Book.