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 |
|---|---|---|---|---|
| 2026-02-23 | POLLARD LUMBER COMPANY — high-priority violation on file | APPLING, Columbia, GA | Pass | State |
| 2026-02-23 | CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC) | ATLANTA, DeKalb, GA | Pass | State |
| 2026-02-23 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-02-23 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-23 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-23 | MAVERICK COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-23 | MAVERICK COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-23 | MURPHY BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2026-02-23 | MURPHY BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2026-02-23 | MURPHY BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2026-02-23 | ZIA HILLS CENTRAL FACILITY | MALAGA, Lea, NM | Pass | State |
| 2026-02-23 | ZIA HILLS CENTRAL FACILITY | MALAGA, Lea, NM | Pass | State |
| 2026-02-23 | DOS EQUIS COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-23 | DOS EQUIS COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-23 | EQT ARO LLC/LYCOMING H&FC COMP STA — high-priority violation on file | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-02-23 | TRI COUNTY PALLET COMPANY INC | BARNWELL, Barnwell, SC | Pass | State |
| 2026-02-23 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pass | State |
| 2026-02-23 | AHLSTROM NA SPECIALTY SOLUTIONS LLC — high-priority violation on file | KAUKAUNA, Ozaukee, WI | Pass | State |
| 2026-02-23 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-23 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-23 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-23 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-23 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-23 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-23 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-23 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-23 | CHAIN LAKES I5 35 4H-8H PAD (CROWHEART ENERGY, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-23 | CHAIN LAKES I5 35 4H-8H PAD (CROWHEART ENERGY, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-23 | CHAIN LAKES I5 35 4H-8H PAD (CROWHEART ENERGY, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-22 | EVERGY, INC. - JEFFREY ENERGY CENTER (AIR) | ST. MARY'S, Pottawatomie, KS | Pass | State |
| 2026-02-22 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-22 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-22 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-22 | SWITCH LTD | LAS VEGAS, Clark, NV | Pending | Local |
| 2026-02-22 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-21 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-21 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-21 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-21 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-21 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-21 | MAHONING LANDFILL, INC. | SPRINGFIELD, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-02-20 | OUTOKUMPU STAINLESS USA, LLC | CALVERT, Mobile, AL | Pass | State |
| 2026-02-20 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-02-20 | TENASKA GEORGIA GENERATING STATION | FRANKLIN, Heard, GA | Pass | State |
| 2026-02-20 | TENASKA GEORGIA GENERATING STATION | FRANKLIN, Heard, GA | Pass | State |
| 2026-02-20 | HECO - WAIAU | PEARL CITY, Honolulu, HI | Pass | State |
| 2026-02-20 | TEXAS EASTERN TRANSMISSION LP - DANVILLE COMPRESSOR STATION | DANVILLE, Boyle, KY | Pass | State |
| 2026-02-20 | UNIVERSITY OF MICHIGAN | ANN ARBOR, Washtenaw, MI | Pass | State |
| 2026-02-20 | ENERGY DEVELOPMENTS WATERVLIET, LLC | WATERVLIET, Berrien, MI | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS ENERGY PRODUCTS INC - SPRINGFIELD 1 | SPRINGFIELD, Greene, MO | Pass | State |
| 2026-02-20 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pending | State |
| 2026-02-20 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2026-02-20 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pending | State |
| 2026-02-20 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2026-02-20 | DUKE ENERGY CORPORATION LCTS | STANLEY, Lincoln, NC | Pass | State |
| 2026-02-20 | TROY LUMBER COMPANY | TROY, Montgomery, NC | Pending | State |
| 2026-02-20 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-02-20 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-02-20 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | N/A | State |
| 2026-02-20 | LONGWOOD - STATELINE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-20 | LONGWOOD - STATELINE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-20 | BOROS EAST FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-02-20 | TANGO COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-20 | CANAL 20-19 BATTERY #1 | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-20 | LESLIE FED WEST FACILITY | JAL, Lea, NM | Pass | State |
| 2026-02-20 | VENOM COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-20 | COMANCHE PEAK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-20 | AMERICAN GYPSUM COMPANY | ALBUQUERQUE, Bernalillo, NM | Pending | Local |
| 2026-02-20 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-20 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-20 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-20 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-20 | SWITCH LTD | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-20 | REPSOL OIL AND GAS USA/TRACT 587 SFL COMP STA | CANTON, Tioga, PA | Pass | State |
| 2026-02-20 | APPALACHIA MIDSTREAM SVC LLC/STAGECOACH COMP STA | WYALUSING, Bradford, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.