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 |
|---|---|---|---|---|
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-04 | COASTAL FOREST PRODUCTS LLC | CHAPMAN, Butler, AL | Pass | State |
| 2026-03-04 | COASTAL FOREST PRODUCTS LLC | CHAPMAN, Butler, AL | Pass | State |
| 2026-03-04 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-03-04 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-03-04 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-03-04 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-03-04 | STEEL DUST RECYCLING LLC | MILLPORT, Lamar, AL | Pass | State |
| 2026-03-04 | EVONIK CORPORATION | THEODORE, Mobile, AL | Pass | State |
| 2026-03-04 | NUCOR STEEL DECATUR LLC | TRINITY, Morgan, AL | Pass | State |
| 2026-03-04 | NATIONAL CEMENT CO OF ALABAMA — high-priority violation on file | RAGLAND, St. Clair, AL | Pass | State |
| 2026-03-04 | NATIONAL CEMENT CO OF ALABAMA — high-priority violation on file | RAGLAND, St. Clair, AL | Pass | State |
| 2026-03-04 | DESOTO GATHERING COMPANY LLC - CHARLEY CPF-3 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-03-04 | DESOTO GATHERING CO., LLC - BALD MOUNTAIN CPF -36 | CLINTON, Van Buren, AR | Pass | State |
| 2026-03-04 | EL PASO NATURAL GAS - WILLCOX COMPRESSOR STATION | WILLCOX, Cochise, AZ | Pass | State |
| 2026-03-04 | TRANSWESTERN PIPELINE - FLAGSTAFF COMPRESSOR STATION | PARKS, Coconino, AZ | Pass | State |
| 2026-03-04 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2026-03-04 | VALENCIA POWER PLANT | NOGALES, Santa Cruz, AZ | Pass | State |
| 2026-03-04 | SAND PIT | LAKE HAVASU CITY, Mohave, AZ | Pass | State |
| 2026-03-04 | LUNDAY-THAGARD CO DBA WORLD OIL REFINING — high-priority violation on file | SOUTH GATE, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-03-04 | CHEVRON U.S.A. INC. | PANAMA CITY, Bay, FL | Pass | State |
| 2026-03-04 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-03-04 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-03-04 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-03-04 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-03-04 | H KRAMER & CO — high-priority violation on file | CHICAGO, Cook, IL | Pass | State |
| 2026-03-04 | US MINERALS | COFFEEN, Montgomery, IL | Pass | State |
| 2026-03-04 | ET GATHERING & PROCESSING - HUGOTON #1 STATION (AIR) | HUGOTON, Haskell, KS | Pass | State |
| 2026-03-04 | KANSAS CITY BPU - NEARMAN (AIR) | KANSAS CITY, Wyandotte, KS | Pass | State |
| 2026-03-04 | PHILLIPS 66 CO - LAKE CHARLES REFINERY — high-priority violation on file | WESTLAKE, Calcasieu, LA | Pass | State |
| 2026-03-04 | AKWEL CADILLAC USA, INC. | CADILLAC, Wexford, MI | Pass | State |
| 2026-03-04 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2026-03-04 | AMES COPPER GROUP - SHELBY | SHELBY, Cleveland, NC | Pending | State |
| 2026-03-04 | HESS TIOGA GAS PLANT LLC - TIOGA GAS PLANT - AQ | TIOGA, Williams, ND | Pass | State |
| 2026-03-04 | CIMAREX - CANYONLANDS 2 STATE COM 1H AND 2H | JAL, Lea, NM | N/A | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.