EPA Air · stack tests by county and year
Air-emissions stack tests in Middlesex County, Massachusetts, 2021
- 4Stack 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 2021. 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, 2021
Air-emissions stack tests in Middlesex County, other years
Air-emissions stack tests recorded in Middlesex County, Massachusetts, 2021
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2021-12-15 | THERMO FISHER SCIENTIFIC | Pass | State |
| 2021-10-21 | SKYWORKS SOLUTIONS INC | Pass | State |
| 2021-09-15 | HUDSON LIGHT & POWER DEPARTMENT | Pass | U.S. EPA |
| 2021-08-19 | WAKEFIELD MUNICIPAL GAS AND LIGHT DEPARTMENT | Pass | U.S. EPA |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.