EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 11,110Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,474
- Indiana 1,010
- California 979
- Florida 795
- Wyoming 755
- New Mexico 724
- Georgia 509
- Pennsylvania 501
- Arkansas 374
- Alabama 357
- Missouri 326
- Texas 316
- Mississippi 263
- Michigan 207
- North Carolina 188
- Colorado 185
- Iowa 167
- Illinois 165
- South Carolina 135
- Wisconsin 135
- West Virginia 114
- Virginia 98
- Idaho 96
- Montana 91
- Tennessee 84
- Minnesota 84
- Delaware 73
- Kentucky 71
- Arizona 71
- Connecticut 68
- Kansas 63
- Nevada 57
- Massachusetts 54
- North Dakota 52
- Nebraska 51
- Utah 51
- Washington 46
- Alaska 45
- New York 43
- South Dakota 34
- District of Columbia 30
- New Hampshire 29
- Maryland 28
- Oregon 27
- Louisiana 26
- Hawaii 21
- Oklahoma 15
- Rhode Island 13
- Puerto Rico 5
- Maine 5
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-06-18 | RIETH RILEY ASPHALT PLANT NO 366 | LA PORTE, LaPorte, IN | Pass | State |
| 2026-06-18 | RIETH RILEY ASPHALT PLANT NO 366 | LA PORTE, LaPorte, IN | Pass | State |
| 2026-06-18 | EPPERSON TREE SERVICE TREE CARE LLC - ACI | HENDERSONVILLE, Henderson, NC | Pending | State |
| 2026-06-18 | SIEMENS ENERGY, INC. | CHARLOTTE, Mecklenburg, NC | Pass | Local |
| 2026-06-18 | S H BELL - STATELINE TERMINAL | EAST LIVERPOOL, Columbiana, OH | Pass | State |
| 2026-06-18 | S H BELL - STATELINE TERMINAL | EAST LIVERPOOL, Columbiana, OH | Pass | State |
| 2026-06-18 | S H BELL - STATELINE TERMINAL | EAST LIVERPOOL, Columbiana, OH | Pass | State |
| 2026-06-18 | S H BELL - STATELINE TERMINAL | EAST LIVERPOOL, Columbiana, OH | Pass | State |
| 2026-06-18 | S H BELL - STATELINE TERMINAL | EAST LIVERPOOL, Columbiana, OH | Pass | State |
| 2026-06-18 | S H BELL - STATELINE TERMINAL | EAST LIVERPOOL, Columbiana, OH | Pass | State |
| 2026-06-18 | S H BELL - STATELINE TERMINAL | EAST LIVERPOOL, Columbiana, OH | Pass | State |
| 2026-06-18 | S H BELL - STATELINE TERMINAL | EAST LIVERPOOL, Columbiana, OH | Pass | State |
| 2026-06-18 | S H BELL - STATELINE TERMINAL | EAST LIVERPOOL, Columbiana, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-06-18 | ASCENT RESOURCES - UTICA LLC - POL PES BL | PEASE, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-18 | ASCENT RESOURCES - UTICA LLC - POL PES BL | PEASE, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-18 | ASCENT RESOURCES - UTICA LLC - POL PES BL | PEASE, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-18 | ASCENT RESOURCES - UTICA LLC - JACK HAMILTON SMF JF | ADENA, Jefferson, OH | Pass | State |
| 2026-06-18 | ASCENT RESOURCES - UTICA LLC - JACK HAMILTON SMF JF | ADENA, Jefferson, OH | Pass | State |
| 2026-06-18 | ASCENT RESOURCES - UTICA LLC - JACK HAMILTON SMF JF | ADENA, Jefferson, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | OSCO INDUSTRIES, INC. NEW BOSTON DIVISI | NEW BOSTON, Scioto, OH | Pass | State |
| 2026-06-18 | LORD CORP/CAMBRIDGE SPRINGS | CAMBRIDGE SPRINGS, Crawford, PA | Pass | State |
| 2026-06-18 | ARDAGH GLASS INC/PORT ALLEGANY PLT — high-priority violation on file | PORT ALLEGANY, McKean, PA | Pass | State |
| 2026-06-18 | SUSQUEHANNA GATHERING CO 1 LLC/CDP 3 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-06-18 | A M WILLIAMS STATION | GOOSE CREEK, Berkeley, SC | Pass | State |
| 2026-06-18 | SYLVAMO NORTH AMERICA LLC - EASTOVER MILL | EASTOVER, Richland, SC | Pass | State |
| 2026-06-18 | KING ASPHALT INC - MULLINS — high-priority violation on file | MULLINS, Marion, SC | Fail | State |
| 2026-06-18 | GCC DACOTAH — high-priority violation on file | RAPID CITY, Pennington, SD | Pass | State |
| 2026-06-18 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | Pass | State |
| 2026-06-18 | MENDOTA MENTAL HEALTH INSTITUTE | MADISON, Dane, WI | Pass | State |
| 2026-06-18 | MOLSON COORS USA LLC | MILWAUKEE, Monroe, WI | Pass | State |
| 2026-06-18 | APPALACHIA MIDSTREAM SERVICES, L.L.C., BLAKE RIDGE FACILITY | NEW MARTINSVILLE, Wetzel, WV | Pass | State |
| 2026-06-18 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-06-18 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-06-18 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-06-18 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-06-18 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-06-18 | PAINTER COMPRESSOR STATION (KERN RIVER GAS TRANSMISSION) | EVANSTON, Uinta, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.