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 |
|---|---|---|---|---|
| 2026-04-23 | LOCKHART POWER CITY WEST DIESEL GENERATING FACILITY | UNION, Union, SC | Pass | State |
| 2026-04-23 | MUELLER CO. LLC — high-priority violation on file | CHATTANOOGA, Hamilton, TN | Pass | Local |
| 2026-04-23 | PACIFICORP HUNTINGTON | HUNTINGTON, Emery, UT | Pass | State |
| 2026-04-23 | QTS INVESTMENT PROPERTIES MANASSAS LLC | MANASSAS, Prince William, VA | Pass | State |
| 2026-04-23 | NAUGHTON PLANT (PACIFICORP) | KEMMERER, Lincoln, WY | Pass | State |
| 2026-04-22 | GULFSTREAM NATURAL GAS SYSTEM LLC | CODEN, Mobile, AL | Pass | State |
| 2026-04-22 | GULFSTREAM NATURAL GAS SYSTEM LLC | CODEN, Mobile, AL | Pass | State |
| 2026-04-22 | ARKEMA INC | AXIS, Mobile, AL | Pass | State |
| 2026-04-22 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2026-04-22 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2026-04-22 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-04-22 | TSMC PHOENIX PROJECT | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2026-04-22 | SO CAL GAS - SO. NEEDLES | NEEDLES, San Bernardino, CA | Pass | Local |
| 2026-04-22 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2026-04-22 | UTAH GAS - DRAGON TRAIL — high-priority violation on file | RANGELY 16.7 MI. S OF, Rio Blanco, CO | Pass | State |
| 2026-04-22 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2026-04-22 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2026-04-22 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-22 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-22 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-22 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-22 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-22 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-22 | INTERNATIONAL PAPER COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2026-04-22 | ATLANTA GAS LIGHT COMPANY - RIVERDALE LNG PLANT — high-priority violation on file | RIVERDALE, Clayton, GA | Pass | State |
| 2026-04-22 | ATLANTA GAS LIGHT COMPANY - RIVERDALE LNG PLANT — high-priority violation on file | RIVERDALE, Clayton, GA | Pass | State |
| 2026-04-22 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-04-22 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-04-22 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-04-22 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-22 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-22 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-22 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-22 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-22 | GENERAL METAL COATINGS | ALEDO, Mercer, IL | Pass | State |
| 2026-04-22 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-22 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-22 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-22 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-22 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-22 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-22 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-22 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-22 | METAL TECHNOLOGIES AUBURN LLC — high-priority violation on file | AUBURN, DeKalb, IN | Pass | State |
| 2026-04-22 | METAL TECHNOLOGIES AUBURN LLC — high-priority violation on file | AUBURN, DeKalb, IN | Pass | State |
| 2026-04-22 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-22 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-22 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-22 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-22 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-22 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-22 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-22 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-22 | HALLADOR POWER COMPANY LLC MEROM GENERATING STATION — high-priority violation on file | SULLIVAN, Sullivan, IN | Pass | State |
| 2026-04-22 | HALLADOR POWER COMPANY LLC MEROM GENERATING STATION — high-priority violation on file | SULLIVAN, Sullivan, IN | Pass | State |
| 2026-04-22 | NATIONAL BIO AND AGRO-DEFENSE FACILITY (AIR) | MANHATTAN, Riley, KS | Pass | State |
| 2026-04-22 | ENERSYS DELAWARE INC | RICHMOND, Madison, KY | Pass | State |
| 2026-04-22 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-22 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-22 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-22 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-22 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-22 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-22 | SPECIALTY MINERALS — high-priority violation on file | ADAMS, TOWN OF, Berkshire, MA | Pending | State |
| 2026-04-22 | ND PAPER INC. | RUMFORD, Oxford, ME | Pass | State |
| 2026-04-22 | BILLERUD ESCANABA LLC | ESCANABA, Delta, MI | Pass | State |
| 2026-04-22 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-04-22 | EES COKE BATTERY, LLC — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-04-22 | METROPOLITAN ST. LOUIS SEWER DISTRICT | SAINT LOUIS COUNTY, St. Louis, MO | Pass | State |
| 2026-04-22 | FLORIDA GAS TRANSMISSION COMPANY LLC, WIGGINS COMPRESSOR STATION NUMBER 10 | WIGGINS, Perry, MS | Pass | State |
| 2026-04-22 | FLORIDA GAS TRANSMISSION COMPANY LLC, WIGGINS COMPRESSOR STATION NUMBER 10 | WIGGINS, Perry, MS | Pass | State |
| 2026-04-22 | FLORIDA GAS TRANSMISSION COMPANY LLC, WIGGINS COMPRESSOR STATION NUMBER 10 | WIGGINS, Perry, MS | Pass | State |
| 2026-04-22 | FLORIDA GAS TRANSMISSION COMPANY LLC, WIGGINS COMPRESSOR STATION NUMBER 10 | WIGGINS, Perry, MS | Pass | State |
| 2026-04-22 | FLORIDA GAS TRANSMISSION COMPANY LLC, WIGGINS COMPRESSOR STATION NUMBER 10 | WIGGINS, Perry, MS | Pass | State |
| 2026-04-22 | FLORIDA GAS TRANSMISSION COMPANY LLC, WIGGINS COMPRESSOR STATION NUMBER 10 | WIGGINS, Perry, MS | Pass | State |
| 2026-04-22 | ARDAGH GLASS INC. | HENDERSON, Vance, NC | Pass | State |
| 2026-04-22 | SAND DUNES NORTH CORRIDOR WEST COMPRESSION STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-22 | SAND DUNES NORTH CORRIDOR WEST COMPRESSION STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-22 | SAND DUNES NORTH CORRIDOR WEST COMPRESSION STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-22 | SAND DUNES NORTH CORRIDOR WEST COMPRESSION STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-22 | SALT FLATS GAS SALES COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-22 | SALT FLATS GAS SALES COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-22 | BIG LIZARD COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-04-22 | BIG LIZARD COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-04-22 | MULVA MANHANDS C CTB | JAL, Lea, NM | Pass | State |
| 2026-04-22 | DARK HORSE TREATING FACILITY — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-22 | RANGER PEAK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-04-22 | RANGER PEAK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BOROVICH RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BOROVICH RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BOROVICH RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BLAYNEY WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BLAYNEY WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | ASCENT RESOURCES - UTICA LLC - BLAYNEY WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-22 | PLYMOUTH FOAM, LLC | NEWCOMERSTOWN, Tuscarawas, OH | Fail | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.