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 |
|---|---|---|---|---|
| 2026-05-12 | HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-12 | HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-12 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-05-12 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-05-12 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-05-12 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-05-12 | AMPACET CORPORATION | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-05-12 | AMPACET CORPORATION | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-05-12 | AMPACET CORPORATION | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-05-12 | AMPACET CORPORATION | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-05-12 | AMPACET CORPORATION | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-05-12 | AMPACET CORPORATION | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-05-12 | AMPACET CORPORATION | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-05-12 | AMPACET CORPORATION | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-05-12 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2026-05-12 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2026-05-12 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2026-05-12 | QUANTUM COMPOSITES INC. | BAY CITY, Bay, MI | Pass | State |
| 2026-05-12 | WEST FRASER US EWP - BEMIDJI | SOLWAY, Beltrami, MN | Pass | State |
| 2026-05-12 | SAPPI CLOQUET LLC | CLOQUET, Carlton, MN | Pass | State |
| 2026-05-12 | CHS HALLOCK | KENNEDY, Kittson, MN | Pass | State |
| 2026-05-12 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | WATCO TRANSLOADING LLC, WTPS AMORY BULK TERMINAL — high-priority violation on file | AMORY, Monroe, MS | Pass | State |
| 2026-05-12 | ASPHALT PAVING OF SHELBY, INC. | KINGS MOUNTAIN, Cleveland, NC | Pass | State |
| 2026-05-12 | SIBELCO NORTH AMERICA - RED HILL FACILITY | BAKERSVILLE, Mitchell, NC | Pending | State |
| 2026-05-12 | CHARLOTTE PIPE AND FOUNDRY COMPANY | OAKBORO, Stanly, NC | Pass | State |
| 2026-05-12 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-05-12 | EMPIRE ABO CS | ARTESIA, Eddy, NM | Pass | State |
| 2026-05-12 | DAGGER DRAW GAS PLANT — high-priority violation on file | ARTESIA, Eddy, NM | Pass | State |
| 2026-05-12 | THE DUDE CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-12 | THE DUDE CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-12 | DAGGER ST (NW) TB | MONUMENT, Lea, NM | Pass | State |
| 2026-05-12 | ARENA ROJA 28 CTB 2 | JAL, Lea, NM | Pass | State |
| 2026-05-12 | ASCENT RESOURCES - UTICA LLC - EUREKA | BELMONT, Belmont, OH | Pass | State |
| 2026-05-12 | ASCENT RESOURCES - UTICA LLC - EUREKA | BELMONT, Belmont, OH | Pass | State |
| 2026-05-12 | ASCENT RESOURCES - UTICA LLC - EUREKA | BELMONT, Belmont, OH | Pass | State |
| 2026-05-12 | ASCENT RESOURCES - UTICA LLC - CROWIE RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-12 | ASCENT RESOURCES - UTICA LLC - CROWIE RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-12 | ASCENT RESOURCES - UTICA LLC - CROWIE RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-12 | NATL FUEL GAS SUPPLY/ELLISBURG STA | ELLISBURG, Potter, PA | Pass | State |
| 2026-05-12 | MONROE ENERGY LLC/TRAINER — high-priority violation on file | TRAINER, Delaware, PA | Pass | State |
| 2026-05-12 | SANDY RUN LDFL LLC/HOPEWELL | HOPEWELL, Bedford, PA | Pass | State |
| 2026-05-12 | RW GATHERING LLC/SALEM COMP STA | DERRY, Westmoreland, PA | Pass | State |
| 2026-05-12 | PETE LIEN & SONS, INC. MAIN PLANT | RAPID CITY, Pennington, SD | Pass | State |
| 2026-05-12 | PAVEMENT RESTORATIONS, INC. | MURFREESBORO, Rutherford, TN | Pass | State |
| 2026-05-12 | TRANSCO COMPRESSOR STATIONS 165 AND 166 | CHATHAM, Pittsylvania, VA | Pass | State |
| 2026-05-12 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-05-12 | EASTERN GAS TRANSMISSION AND STORAGE, INC., KENNEDY STATION | VALLEY CHAPEL, Lewis, WV | Pass | State |
| 2026-05-11 | DESOTO GATHERING COMPANY, LLC - STEELHEAD CPF-3 | CLINTON, Van Buren, AR | Pass | State |
| 2026-05-11 | DESOTO GATHERING COMPANY, LLC - STEELHEAD CPF-3 | CLINTON, Van Buren, AR | Pass | State |
| 2026-05-11 | DESOTO GATHERING COMPANY, LLC - STEELHEAD CPF-3 | CLINTON, Van Buren, AR | Pass | State |
| 2026-05-11 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2026-05-11 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-05-11 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-05-11 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-05-11 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-05-11 | QB ENERGY OPERATING - STORY GULCH C.S. — high-priority violation on file | PARACHUTE 13.8 MI. N OF, Garfield, CO | Pass | State |
| 2026-05-11 | QB ENERGY OPERATING - STORY GULCH C.S. — high-priority violation on file | PARACHUTE 13.8 MI. N OF, Garfield, CO | Pass | State |
| 2026-05-11 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-11 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-11 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-11 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-11 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-11 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-11 | JOHN S LANE & SONS INC | AMHERST, Hampshire, MA | Pending | State |
| 2026-05-11 | CAMBRIA CO | LE SUEUR, Le Sueur, MN | Pass | State |
| 2026-05-11 | SIOUXLAND ETHANOL LLC — high-priority violation on file | JACKSON, Dakota, NE | Pass | State |
| 2026-05-11 | DAGGER DRAW GAS PLANT — high-priority violation on file | ARTESIA, Eddy, NM | Pass | State |
| 2026-05-11 | JANIE CONNER FACILITY — high-priority violation on file | MALAGA, Eddy, NM | Pass | State |
| 2026-05-11 | SIMON CAMAMILE SOUTH TB | LA HUERTA, Eddy, NM | Pass | State |
| 2026-05-11 | THE DUDE CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-11 | THE DUDE CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-11 | HELIOS COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-05-11 | HELIOS COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-05-11 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-11 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-11 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-11 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-11 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-11 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-11 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-11 | REGENCY MARCELLUS GAS GATHERING LLC/ KORBAN COMP STA | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2026-05-11 | WCAA UPSTREAM LLC/GRAHAM WELLPAD | DARRAGH, Westmoreland, PA | Pass | State |
| 2026-05-11 | TEAGUE SWEET AND SOUR COMPRESSOR STATION | TEAGUE, Freestone, TX | Pass | State |
| 2026-05-11 | BATTLE HORSE PLANT | BRENHAM, Washington, TX | Pass | State |
| 2026-05-11 | BATTLE HORSE PLANT | BRENHAM, Washington, TX | Pass | State |
| 2026-05-11 | BATTLE HORSE PLANT | BRENHAM, Washington, TX | Pass | State |
| 2026-05-11 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | WOODS CROSS, Davis, UT | Pass | State |
| 2026-05-11 | TRANSCO COMPRESSOR STATIONS 165 AND 166 | CHATHAM, Pittsylvania, VA | Pass | State |
| 2026-05-11 | TRANSCO COMPRESSOR STATIONS 165 AND 166 | CHATHAM, Pittsylvania, VA | Pass | State |
| 2026-05-11 | PACKAGING CORPORATION OF AMERICA-TOMAHAW | TOMAHAWK, Lincoln, WI | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.