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 |
|---|---|---|---|---|
| 2026-01-28 | SOUTHERN VENEER PRODUCTS | FITZGERALD, Ben Hill, GA | Pass | State |
| 2026-01-28 | SOUTHERN NATURAL GAS COMPANY, L.L.C - RICEBORO COMP. STATION | RICEBORO, Liberty, GA | Pass | State |
| 2026-01-28 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-01-28 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-01-28 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-01-28 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2026-01-28 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2026-01-28 | NORTHERN NATURAL GAS - BUSHTON STATION (AIR) | BUSHTON, Rice, KS | Pass | State |
| 2026-01-28 | JAYBIRD & MAIS INC | LAWRENCE, CITY OF, Essex, MA | Pending | State |
| 2026-01-28 | MICHIGAN SUGAR COMPANY - SEBEWAING FACTORY — high-priority violation on file | SEBEWAING, Huron, MI | Pass | State |
| 2026-01-28 | LACKS ENTERPRISES, INC. — high-priority violation on file | GRAND RAPIDS, Kent, MI | Pass | State |
| 2026-01-28 | FIRSTHEALTH OF THE CAROLINAS - MOORE REGIONAL HOSPITAL | PINEHURST, Moore, NC | Pending | State |
| 2026-01-28 | AG PROCESSING INC — high-priority violation on file | DAVID CITY, Butler, NE | N/A | State |
| 2026-01-28 | TATER TOT 2 CTB 5 | MALAGA, Eddy, NM | Pass | State |
| 2026-01-28 | CHARLES LING WEST FED TANK BATTERY | JAL, Lea, NM | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-01-28 | FCA US LLC - TOLEDO NORTH ASSEMBLY | TOLEDO, Lucas, OH | Pass | State |
| 2026-01-28 | IVEX PROTECTIVE PACKAGING, LLC | SIDNEY, Shelby, OH | Pass | State |
| 2026-01-28 | IVEX PROTECTIVE PACKAGING, LLC | SIDNEY, Shelby, OH | Pass | State |
| 2026-01-28 | IVEX PROTECTIVE PACKAGING, LLC | SIDNEY, Shelby, OH | Pass | State |
| 2026-01-28 | IVEX PROTECTIVE PACKAGING, LLC | SIDNEY, Shelby, OH | Pass | State |
| 2026-01-28 | EQUITRANS LP - PLASMA COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2026-01-28 | EQUITRANS LP - PLASMA COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2026-01-28 | EQUITRANS LP - PLASMA COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2026-01-28 | EASTERN GAS TRANSMISSION AND STORAGE - LEBANON STATION | LEBANON, Warren, OH | Pass | State |
| 2026-01-28 | REPSOL OIL& GAS USA LLC/REPINE COMP STA | LITTLE MEADOWS, Susquehanna, PA | Pass | State |
| 2026-01-28 | EXPAND OPERATING LLC/SIVERS BRA PAD | LACEYVILLE, Bradford, PA | Pass | State |
| 2026-01-28 | HOWELL, G. PAD 1 | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2026-01-28 | BUSIK, J. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-01-28 | LIPPINCOTT, F. PAD 1 — high-priority violation on file | KINGSLEY, Susquehanna, PA | Pass | State |
| 2026-01-28 | P&G 3 WELL SITE | MESHOPPEN, Wyoming, PA | Pass | State |
| 2026-01-28 | COLOSSUS DATA CENTER | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-01-28 | AQUATIC CO | YELM, Thurston, WA | Pass | Local |
| 2026-01-28 | GAS TRANSMISSION NORTHWEST, LLC | WASHINGTON, Undetermined, WA | Pass | Local |
| 2026-01-28 | MINT FARM GENERATION, LLC. | LONGVIEW, Cowlitz, WA | Pass | Local |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-28 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-27 | INDORAMA VENTURES XYLENES & PTA LLC | DECATUR, Morgan, AL | Pass | State |
| 2026-01-27 | BBT ALATENN, LLC | TANNER, Limestone, AL | Pass | State |
| 2026-01-27 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-01-27 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2026-01-27 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.