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 |
|---|---|---|---|---|
| 2026-03-17 | UNITED STATES AIR FORCE | OKALOOSA COUNTY, Okaloosa, FL | Pass | State |
| 2026-03-17 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-03-17 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-03-17 | SEMINOLE ELECTRIC COOPERATIVE, INC. | PALATKA, Putnam, FL | Pass | State |
| 2026-03-17 | FLORIDA GAS TRANSMISSION COMPANY, LLC | PERRY, Taylor, FL | Pass | State |
| 2026-03-17 | FLORIDA GAS TRANSMISSION COMPANY, LLC | PERRY, Taylor, FL | Pass | State |
| 2026-03-17 | FLORIDA GAS TRANSMISSION COMPANY, LLC | PERRY, Taylor, FL | Pass | State |
| 2026-03-17 | KINDER MORGAN SOUTHEAST TERMINALS, LLC | ATHENS, Clarke, GA | Pass | State |
| 2026-03-17 | EMORY UNIVERSITY | ATLANTA, DeKalb, GA | Pass | State |
| 2026-03-17 | GEORGIA INSTITUTE OF TECHNOLOGY | ATLANTA, Fulton, GA | Pass | State |
| 2026-03-17 | GEORGIA INSTITUTE OF TECHNOLOGY | ATLANTA, Fulton, GA | Pass | State |
| 2026-03-17 | US BATTERY MFG CO OF AUGUSTA | AUGUSTA, Richmond, GA | Pass | State |
| 2026-03-17 | US BATTERY MFG CO OF AUGUSTA | AUGUSTA, Richmond, GA | Pass | State |
| 2026-03-17 | US BATTERY MFG CO OF AUGUSTA | AUGUSTA, Richmond, GA | Pass | State |
| 2026-03-17 | US BATTERY MFG CO OF AUGUSTA | AUGUSTA, Richmond, GA | Pass | State |
| 2026-03-17 | US BATTERY MFG CO OF AUGUSTA | AUGUSTA, Richmond, GA | Pass | State |
| 2026-03-17 | INTERFOR U.S. INC. - THOMASTON MILL — high-priority violation on file | THOMASTON, Upson, GA | Pass | State |
| 2026-03-17 | INTERFOR U.S. INC. - THOMASTON MILL — high-priority violation on file | THOMASTON, Upson, GA | Pass | State |
| 2026-03-17 | INTERFOR U.S. INC. - THOMASTON MILL — high-priority violation on file | THOMASTON, Upson, GA | Pass | State |
| 2026-03-17 | INTERFOR U.S. INC. - THOMASTON MILL — high-priority violation on file | THOMASTON, Upson, GA | Pass | State |
| 2026-03-17 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-17 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-17 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-17 | DUKE ENERGY INDIANA LLC CAYUGA GENERATING STATION — high-priority violation on file | CAYUGA, Vermillion, IN | Pass | State |
| 2026-03-17 | DUKE ENERGY INDIANA LLC CAYUGA GENERATING STATION — high-priority violation on file | CAYUGA, Vermillion, IN | Pass | State |
| 2026-03-17 | KY UTILITIES CO - BROWN STATION | HARRODSBURG, Mercer, KY | Pass | State |
| 2026-03-17 | ENTEGRIS INC — high-priority violation on file | BEDFORD, TOWN OF, Middlesex, MA | Pending | State |
| 2026-03-17 | ENTEGRIS INC — high-priority violation on file | BEDFORD, TOWN OF, Middlesex, MA | Pending | State |
| 2026-03-17 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-03-17 | BUSHMILLS ETHANOL INC | ATWATER, Kandiyohi, MN | Pass | State |
| 2026-03-17 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2026-03-17 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2026-03-17 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Fail | State |
| 2026-03-17 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Fail | State |
| 2026-03-17 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-17 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Fail | State |
| 2026-03-17 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC - STATION 150 | MOORESVILLE, Iredell, NC | Pending | State |
| 2026-03-17 | DUKE ENERGY CORPORATION LCTS | STANLEY, Lincoln, NC | Pass | State |
| 2026-03-17 | PRESTAGE AGENERGY - MOLTONVILLE | CLINTON, Sampson, NC | Pending | State |
| 2026-03-17 | RJ CHIPPING ENTERPRISES, INC. | SHELBURNE, Coos, NH | Pass | State |
| 2026-03-17 | REVEILLE COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-17 | RED RAIDER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-17 | ZIA HILLS CENTRAL FACILITY | MALAGA, Lea, NM | Pass | State |
| 2026-03-17 | RICO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-03-17 | RICO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-03-17 | BONNYMAN COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2026-03-17 | BONNYMAN COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2026-03-17 | DOS EQUIS COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | PROSPIRA AMERICA CORPORATION | UPPER SANDUSKY, Wyandot, OH | Pass | State |
| 2026-03-17 | CARGILL, INC. - DAYTON | DAYTON, Montgomery, OH | Pass | State |
| 2026-03-17 | CARGILL, INC. - DAYTON | DAYTON, Montgomery, OH | Pass | State |
| 2026-03-17 | ET GATHERING PROCESSING LLC / ALEX COMPRESSOR STATION | ALEX, Grady, OK | Pass | State |
| 2026-03-17 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/FULTON BOOSTER STA — high-priority violation on file | HICKORY, Washington, PA | Pass | State |
| 2026-03-17 | MARKWEST LIBERTY MIDST & RESOURCES/THREE BROTHERS COMP STA | BURGETTSTOWN, Washington, PA | Pass | State |
| 2026-03-17 | TEMPLE UNIV/ MAIN CAMPUS — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Fail | Local |
| 2026-03-17 | AHLSTROM STEVENS POINT LLC — high-priority violation on file | STEVENS POINT, Price, WI | Pass | State |
| 2026-03-17 | S.C. JOHNSON & SON, INC | STURTEVANT, Racine, WI | Pass | State |
| 2026-03-17 | RICHLAND CENTER RENEWABLE ENERGY | RICHLAND CENTER, Rock, WI | Pass | State |
| 2026-03-17 | MARKWEST LIBERTY MIDSTREAM & RESOURCES, L.L.C., SHERWOOD | WEST UNION, Doddridge, WV | Pass | State |
| 2026-03-17 | CHEYENNE RENEWABLE DIESEL COMPANY (CHEYENNE RENEWABLE DIESEL COMPANY LLC) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-03-17 | CHEYENNE RENEWABLE DIESEL COMPANY (CHEYENNE RENEWABLE DIESEL COMPANY LLC) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-03-17 | CHEYENNE RENEWABLE DIESEL COMPANY (CHEYENNE RENEWABLE DIESEL COMPANY LLC) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-03-17 | CHEYENNE RENEWABLE DIESEL COMPANY (CHEYENNE RENEWABLE DIESEL COMPANY LLC) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-03-17 | CHEYENNE RENEWABLE DIESEL COMPANY (CHEYENNE RENEWABLE DIESEL COMPANY LLC) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-03-17 | CHEYENNE RENEWABLE DIESEL COMPANY (CHEYENNE RENEWABLE DIESEL COMPANY LLC) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-03-17 | CHEYENNE RENEWABLE DIESEL COMPANY (CHEYENNE RENEWABLE DIESEL COMPANY LLC) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-03-17 | CHEYENNE RENEWABLE DIESEL COMPANY (CHEYENNE RENEWABLE DIESEL COMPANY LLC) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-03-16 | DESOTO GATHERING COMPANY, LLC - PHILLIPS MOUNTAIN CPF-2 | CLEVELAND, Conway, AR | Pass | State |
| 2026-03-16 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-03-16 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-03-16 | CITY OF DARDANELLE — high-priority violation on file | DARDANELLE, Yell, AR | Pass | State |
| 2026-03-16 | TESORO REFINING AND MARKETING CO — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2026-03-16 | TESORO REFINING AND MARKETING CO, LLC | CARSON, Los Angeles, CA | Pass | Local |
| 2026-03-16 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | N/A | State |
| 2026-03-16 | ASCEND PERFORMANCE MATERIALS OPERATIONS — high-priority violation on file | CANTONMENT, Escambia, FL | Pass | State |
| 2026-03-16 | MOSAIC FERTILIZER, LLC — high-priority violation on file | BARTOW, Polk, FL | Pass | State |
| 2026-03-16 | MOSAIC FERTILIZER, LLC — high-priority violation on file | BARTOW, Polk, FL | Pass | State |
| 2026-03-16 | EMORY UNIVERSITY | ATLANTA, DeKalb, GA | Pass | State |
| 2026-03-16 | C & D TECHNOLOGIES INC | ATTICA, Fountain, IN | Pass | State |
| 2026-03-16 | C & D TECHNOLOGIES INC | ATTICA, Fountain, IN | Pass | State |
| 2026-03-16 | ZIONSVILLE COMPRESSOR STATION / PANHANDLE EASTERN PIPE LINE — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-03-16 | ZIONSVILLE COMPRESSOR STATION / PANHANDLE EASTERN PIPE LINE — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-03-16 | ZIONSVILLE COMPRESSOR STATION / PANHANDLE EASTERN PIPE LINE — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-03-16 | BONNYMAN COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2026-03-16 | BONNYMAN COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2026-03-16 | DOS EQUIS COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-16 | DOS EQUIS COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-16 | NFG MIDSTREAM COVINGTON LLC/DCNR TRACT 595 | ARNOT, Tioga, PA | Pass | State |
| 2026-03-16 | TEMPLE UNIV/ MAIN CAMPUS — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2026-03-16 | AHLSTROM MOSINEE, LLC — high-priority violation on file | MOSINEE, Marathon, WI | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.