EPA Air · stack tests by state, industry and year
Chemical manufacturing (NAICS 3254): stack tests in Connecticut, 2025
- 4Stack 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 2025 at a Connecticut source whose primary industry code is NAICS 3254. A facility filing more than one industry code is counted under the first one on its record.
Chemical manufacturing (NAICS 3254) in Connecticut, other years
Other industries in Connecticut, 2025
- Utilities (NAICS 2211) 57
- Educational services (NAICS 6113) 21
- Transportation equipment manufacturing (NAICS 3364) 12
- Pipeline transportation (NAICS 4862) 10
- Waste management and remediation (NAICS 5622) 8
- Utilities (NAICS 2213) 8
- Transportation equipment manufacturing (NAICS 3366) 6
- Support activities for transportation (NAICS 4881) 4
- Nonmetallic mineral product manufacturing (NAICS 3279) 4
- Paper manufacturing (NAICS 3221) 4
- Plastics and rubber products manufacturing (NAICS 3261) 3
- Fabricated metal product manufacturing (NAICS 3322) 3
- Paper manufacturing (NAICS 3222) 3
- Merchant wholesalers, nondurable goods (NAICS 4247) 3
Air-emissions stack tests recorded in Connecticut, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-06-19 | PFIZER GLOBAL MANUFACTURING | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2025-01-07 | BOEHRINGER INGELHEIM PHARMACEUTICALS INC | RIDGEFIELD, Fairfield, CT | Pass | State |
| 2025-01-07 | BOEHRINGER INGELHEIM PHARMACEUTICALS INC | RIDGEFIELD, Fairfield, CT | Pass | State |
| 2025-01-06 | YALE UNIVERSITY WEST CAMPUS | WEST HAVEN, New Haven, CT | Pass | 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.