EPA Air · stack tests by county and year
Air-emissions stack tests in Middlesex County, Massachusetts, 2025
- 13Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Middlesex County, Massachusetts during 2025. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Middlesex County facility page.
Middlesex County, Massachusetts, 2025
Air-emissions stack tests in Middlesex County, other years
Air-emissions stack tests recorded in Middlesex County, Massachusetts, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-08-21 | BENEVENTO ASPHALT CORPORATION | Pass | U.S. EPA |
| 2025-08-04 | SKYWORKS SOLUTIONS INC | Pending | State |
| 2025-07-17 | COLONIAL GAS TEWKSBURY LNG | Pass | State |
| 2025-07-03 | BENEVENTO ASPHALT CORPORATION | Pass | State |
| 2025-06-27 | HOLLINGSWORTH & VOSE | Pass | State |
| 2025-06-25 | HOLLINGSWORTH & VOSE | Pass | State |
| 2025-06-05 | NEWPORT AGGREGATES | Pass | U.S. EPA |
| 2025-05-20 | BENEVENTO ASPHALT CORPORATION | Pass | U.S. EPA |
| 2025-04-29 | BENEVENTO ASPHALT CORPORATION | Pass | U.S. EPA |
| 2025-04-11 | MASSACHUSETTS INSTITUTE OF TECHNOLOGY | Pass | State |
| 2025-01-21 | BAKER COMMODITIES | Pending | State |
| 2025-01-02 | HARVARD UNIVERSITY | Pass | State |
| 2025-01-02 | HOPKINTON LNG CORP | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.