EPA Air · stack tests by state, industry and year
Machinery manufacturing (NAICS 3332): stack tests in Massachusetts, 2026
- 5Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row is one stack test recorded during 2026 at a Massachusetts source whose primary industry code is NAICS 3332. A facility filing more than one industry code is counted under the first one on its record.
Other industries in Massachusetts, 2026
- Utilities (NAICS 2211) 13
- Waste management and remediation (NAICS 5622) 6
- Educational services (NAICS 6113) 4
- Utilities (NAICS 2213) 3
- Hospitals (NAICS 6221) 3
- Pipeline transportation (NAICS 4862) 3
- Mining and quarrying (NAICS 2123) 3
Air-emissions stack tests recorded in Massachusetts, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-04-17 | ENTEGRIS INC — high-priority violation on file | BEDFORD, TOWN OF, Middlesex, MA | Pending | State |
| 2026-03-17 | ENTEGRIS INC — high-priority violation on file | BEDFORD, TOWN OF, Middlesex, MA | Pending | State |
| 2026-03-17 | ENTEGRIS INC — high-priority violation on file | BEDFORD, TOWN OF, Middlesex, MA | Pending | State |
| 2026-03-11 | ENTEGRIS INC — high-priority violation on file | BEDFORD, TOWN OF, Middlesex, MA | Pending | State |
| 2026-01-27 | ENTEGRIS INC — high-priority violation on file | BEDFORD, TOWN OF, Middlesex, MA | Pending | State |
Primary NAICS code as filed on the facility record; dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.