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 |
|---|---|---|---|---|
| 2026-05-13 | ENVIVA PELLETS EPES, LLC | EPES, Sumter, AL | Pass | State |
| 2026-05-13 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-5 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-05-13 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-5 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-05-13 | LION OIL COMPANY | EL DORADO, Union, AR | Pass | State |
| 2026-05-13 | LION OIL COMPANY | EL DORADO, Union, AR | Pass | State |
| 2026-05-13 | LHOIST NORTH AMERCA OF ARIZONA - NELSON | ARIZONA, Undetermined, AZ | Pass | State |
| 2026-05-13 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | COTTAGE BAKERY, INC. | LODI, San Joaquin, CA | Pass | Local |
| 2026-05-13 | COTTAGE BAKERY, INC. | LODI, San Joaquin, CA | Pass | Local |
| 2026-05-13 | COTTAGE BAKERY, INC. | LODI, San Joaquin, CA | Pass | Local |
| 2026-05-13 | COTTAGE BAKERY, INC. | LODI, San Joaquin, CA | Pass | Local |
| 2026-05-13 | SOUTHERN CALIFORNIA GAS CO | VENTURA, Ventura, CA | Pass | Local |
| 2026-05-13 | KT RESOURCES - WHITE RIVER DOME | MEEKER 14.5 MI. W OF, Rio Blanco, CO | Pass | State |
| 2026-05-13 | HIGHPOINT OPERATING -CIRCLE B 5-61-27 CS | ORCHARD 4.0 MI. N OF, Weld, CO | Pass | State |
| 2026-05-13 | WHEELABRATOR BRIDGEPORT LP | BRIDGEPORT, Fairfield, CT | Pass | State |
| 2026-05-13 | L.V. THOMPSON, INC. (TAMCO) | TAMPA, Hillsborough, FL | Pass | State |
| 2026-05-13 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-05-13 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-13 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-13 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-13 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-13 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-13 | MOUNT VERNON MILLS | TRION, Chattooga, GA | Pass | State |
| 2026-05-13 | MOUNT VERNON MILLS | TRION, Chattooga, GA | Pass | State |
| 2026-05-13 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-13 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-13 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-13 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-13 | PCS NITROGEN FERTILIZER L.P. - AUGUSTA PLANT | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-13 | PCS NITROGEN FERTILIZER L.P. - AUGUSTA PLANT | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-13 | FPL FOOD, LLC — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-13 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-13 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2026-05-13 | MTBT - OTTUMWA | OTTUMWA, Wapello, IA | Pass | State |
| 2026-05-13 | CONMAT INC | DIXON, Lee, IL | Pass | State |
| 2026-05-13 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-13 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-13 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-13 | MGPI OF INDIANA LLC | LAWRENCEBURG, Dearborn, IN | Pass | State |
| 2026-05-13 | MGPI OF INDIANA LLC | LAWRENCEBURG, Dearborn, IN | Pass | State |
| 2026-05-13 | CATERPILLAR REMAN POWERTRAIN INDIANA INC | FRANKLIN, Johnson, IN | Pass | State |
| 2026-05-13 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-05-13 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-05-13 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-05-13 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-05-13 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-05-13 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-05-13 | LONE STAR INDUSTRIES INCORPORATED DBA BUZZI UNICEM USA — high-priority violation on file | GREENCASTLE, Putnam, IN | Pass | State |
| 2026-05-13 | LONE STAR INDUSTRIES INCORPORATED DBA BUZZI UNICEM USA — high-priority violation on file | GREENCASTLE, Putnam, IN | Pass | State |
| 2026-05-13 | MATALCO BLUFFTON LLC — high-priority violation on file | BLUFFTON, Wells, IN | Pass | State |
| 2026-05-13 | MATALCO BLUFFTON LLC — high-priority violation on file | BLUFFTON, Wells, IN | Pass | State |
| 2026-05-13 | MATALCO BLUFFTON LLC — high-priority violation on file | BLUFFTON, Wells, IN | Pass | State |
| 2026-05-13 | MATALCO BLUFFTON LLC — high-priority violation on file | BLUFFTON, Wells, IN | Pass | State |
| 2026-05-13 | ST MARYS CEMENT U.S. LLC, CHARLEVOIX PLANT | CHARLEVOIX, Charlevoix, MI | Pass | State |
| 2026-05-13 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-05-13 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-05-13 | DTE ELECTRIC COMPANY - GREENWOOD ENERGY CENTER | KENOCKEE, St. Clair, MI | Pass | State |
| 2026-05-13 | DENSO MANUFACTURING MICHIGAN, INC. | BATTLE CREEK, Calhoun, MI | Pass | State |
| 2026-05-13 | AIR PRODUCTS AND CHEMICALS, INC. | DETROIT, Wayne, MI | Pass | State |
| 2026-05-13 | CONTINENTAL CEMENT COMPANY LLC — high-priority violation on file | HANNIBAL, Ralls, MO | Pass | State |
| 2026-05-13 | CONTINENTAL CEMENT COMPANY LLC — high-priority violation on file | HANNIBAL, Ralls, MO | Pass | State |
| 2026-05-13 | TRANSMONTAIGNE OPERATING COMPANY LP, MERIDIAN TERMINAL | MERIDIAN, Lauderdale, MS | Pass | State |
| 2026-05-13 | TRANSMONTAIGNE OPERATING COMPANY LP, MERIDIAN TERMINAL | MERIDIAN, Lauderdale, MS | Pass | State |
| 2026-05-13 | TRANSMONTAIGNE OPERATING COMPANY LP, MERIDIAN TERMINAL | MERIDIAN, Lauderdale, MS | Pass | State |
| 2026-05-13 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2026-05-13 | PACTIV LLC | GREENSBORO, Guilford, NC | Pending | State |
| 2026-05-13 | SIBELCO NORTH AMERICA - CRYSTAL FACILITY | SPRUCE PINE, Mitchell, NC | Pending | State |
| 2026-05-13 | CAN-ONE (USA), INC. D/B/A KJ CAN USA | NASHUA, Hillsborough, NH | Pass | State |
| 2026-05-13 | EMPIRE ABO CS | ARTESIA, Eddy, NM | Pass | State |
| 2026-05-13 | EMPIRE ABO CS | ARTESIA, Eddy, NM | Pass | State |
| 2026-05-13 | THE DUDE CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-13 | THE DUDE CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-13 | RW GATHERING LLC/MOSHANNON COMP STA | DRIFTING, Clearfield, PA | Pass | State |
| 2026-05-13 | EQUITRANS LP/JEFFERSON COMP STA | LIPPINCOTT, Greene, PA | Pass | State |
| 2026-05-13 | KC MIDSTREAM SOLUTIONS LLC/OVERBEK STA | RIDGWAY, Elk, PA | Pass | State |
| 2026-05-13 | CARDINAL ENERGY CORPORATION | MIDDLETOWN, Frederick, VA | Pass | State |
| 2026-05-13 | GLOBAL CELLULOSE FIBERS - FRANKLIN MILL | FRANKLIN, Isle of Wight, VA | Pass | State |
| 2026-05-13 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-05-13 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-05-12 | SOUTHERN NATURAL GAS | ANNISTON, Calhoun, AL | Pass | State |
| 2026-05-12 | BOISE CASCADE WOOD PRODUCTS, LLC | THORSBY, Chilton, AL | Pass | State |
| 2026-05-12 | BOISE CASCADE WOOD PRODUCTS, LLC | THORSBY, Chilton, AL | Pass | State |
| 2026-05-12 | KIMBERLY-CLARK CORPORATION | MOBILE, Mobile, AL | Pass | State |
| 2026-05-12 | KIMBERLY-CLARK CORPORATION | MOBILE, Mobile, AL | Pass | State |
| 2026-05-12 | ENVIVA PELLETS EPES, LLC | EPES, Sumter, AL | Pass | State |
| 2026-05-12 | ENVIVA PELLETS EPES, LLC | EPES, Sumter, AL | Pass | State |
| 2026-05-12 | WEYERHAEUSER NR COMPANY - EMERSON | EMERSON, Columbia, AR | Pass | State |
| 2026-05-12 | ALBEMARLE CORPORATION-SOUTH PLANT | MAGNOLIA, Columbia, AR | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.