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 |
|---|---|---|---|---|
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | EL PASO NATURAL GAS CO - WENDEN COMPRESSOR STATION | CENTENNIAL, La Paz, AZ | Pass | State |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file | MEEKER 23.2 MI. W OF, Rio Blanco, CO | Pending | State |
| 2026-03-10 | ROCKY MOUNTAIN MIDSTREAM - AUBURN CS | KERSEY AREA, Weld, CO | Pass | State |
| 2026-03-10 | ROCKY MOUNTAIN MIDSTREAM - AUBURN CS | KERSEY AREA, Weld, CO | Pass | State |
| 2026-03-10 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | MIDDLETOWN, Middlesex, CT | Pass | State |
| 2026-03-10 | AMERICAN UNIVERSITY | WASHINGTON, District of Columbia, DC | Pass | State |
| 2026-03-10 | AMERICAN UNIVERSITY | WASHINGTON, District of Columbia, DC | Pass | State |
| 2026-03-10 | TITAN FLORIDA LLC | MEDLEY, Miami-Dade, FL | Pass | State |
| 2026-03-10 | TITAN FLORIDA LLC | MEDLEY, Miami-Dade, FL | Pass | State |
| 2026-03-10 | POLYNT COMPOSITES USA INC. | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-03-10 | ASCEND PERFORMANCE MATERIALS OPERATIONS — high-priority violation on file | CANTONMENT, Escambia, FL | Pass | State |
| 2026-03-10 | LOCKHEED MARTIN AERONAUTICS CO. | MARIETTA, Cobb, GA | Pass | State |
| 2026-03-10 | THE PROCTER & GAMBLE PAPER PRODUCTS COMPANY, ALBANY — high-priority violation on file | ALBANY, Dougherty, GA | Pass | State |
| 2026-03-10 | HECO - WAIAU | PEARL CITY, Honolulu, HI | Pass | State |
| 2026-03-10 | NORTHERN NATURAL GAS CO-OGDEN | OGDEN, Boone, IA | Pass | State |
| 2026-03-10 | NORTHERN NATURAL GAS CO-OGDEN | OGDEN, Boone, IA | Pass | State |
| 2026-03-10 | LOUIS DREYFUS COMPANY GRAND JUNCTION, LLC | GRAND JUNCTION, Greene, IA | Pass | State |
| 2026-03-10 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2026-03-10 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2026-03-10 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-03-10 | SEABOARD TRIUMPH FOODS, LLC — high-priority violation on file | CITY OF SIOUX CITY, Woodbury, IA | Fail | State |
| 2026-03-10 | CARMI LIGHT & WATER | CARMI, White, IL | Pass | State |
| 2026-03-10 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-03-10 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-03-10 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-03-10 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-03-10 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-03-10 | TEXAS GAS TRANSMISSION LLC - MIDLAND III TRANSMISSION | BREMEN, Muhlenberg, KY | Pass | State |
| 2026-03-10 | CF INDUSTRIES NITROGEN LLC - DONALDSONVILLE NITROGEN COMPLEX | DONALDSONVILLE, Ascension, LA | Pass | State |
| 2026-03-10 | SBC ENERGY LLC FKA SOUTHBRIDGE POWER & THERMAL LLC | SOUTHBRIDGE, Worcester, MA | Pending | State |
| 2026-03-10 | MAGNA MIRRORS NORTH AMERICA | NEWAYGO, Newaygo, MI | Pass | State |
| 2026-03-10 | OWATONNA ENERGY STATION | OWATONNA, Steele, MN | Pass | State |
| 2026-03-10 | TEXAS EASTERN TRANSMISSION LP, CLINTON COMPRESSOR STATION | JACKSON, Hinds, MS | Pass | State |
| 2026-03-10 | WILLISTON BASIN - LITTLE BEAVER | BAKER, Fallon, MT | Pass | State |
| 2026-03-10 | WILLISTON BASIN - LITTLE BEAVER | BAKER, Fallon, MT | Pass | State |
| 2026-03-10 | BOZEMAN PRODUCT TERMINAL | BOZEMAN, Gallatin, MT | Pass | State |
| 2026-03-10 | MARTIN MARIETTA MATERIALS, INC. - STATESVILLE QUARRY | STATESVILLE, Iredell, NC | Pass | State |
| 2026-03-10 | CHEVRON- CULEBRA BLUFF SECTION 26 CS | LOVING, Eddy, NM | Pass | State |
| 2026-03-10 | CHEVRON- CULEBRA BLUFF SECTION 26 CS | LOVING, Eddy, NM | Pass | State |
| 2026-03-10 | RED ROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-03-10 | EAST VACUUM LIQUID RECOVERY AND CO2 PLANT | BUCKEYE, Lea, NM | N/A | State |
| 2026-03-10 | EAST VACUUM LIQUID RECOVERY AND CO2 PLANT | BUCKEYE, Lea, NM | N/A | State |
| 2026-03-10 | RED TANK 26 BOO STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-03-10 | ALLEY CAT 17 CTB 4 | MALAGA, Lea, NM | Pass | State |
| 2026-03-10 | ALLEY CAT 17 CTB 4 | MALAGA, Lea, NM | Pass | State |
| 2026-03-10 | AVERY DENNISON STD, BLDG 5 | PAINESVILLE, Lake, OH | Pass | State |
| 2026-03-10 | AVERY DENNISON STD, BLDG 5 | PAINESVILLE, Lake, OH | Pass | State |
| 2026-03-10 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ INC | WILLOUGHBY, Lake, OH | Pass | State |
| 2026-03-10 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ INC | WILLOUGHBY, Lake, OH | Pass | State |
| 2026-03-10 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ INC | WILLOUGHBY, Lake, OH | Pass | State |
| 2026-03-10 | DOMINION RESOURCE SERVICES - SIRON | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-03-10 | DOMINION RESOURCE SERVICES - SIRON | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-03-10 | DOMINION RESOURCE SERVICES - SIRON | CAMBRIDGE, Guernsey, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.