EPA Air · by county
Air-emissions sources in Suffolk County, Massachusetts
- 412Facilities
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Every stationary source in Suffolk County, Massachusetts that holds a Clean Air Act permit or is otherwise tracked by an air agency — planned, under construction, operating, seasonal or temporarily closed. Sources EPA records as permanently closed are not listed.
Every source’s record in Suffolk County
Each of the 370 operating major, synthetic minor and minor sources in Suffolk County, Massachusetts has a record page: every source in Suffolk County, A to Z.
By emissions classification in Suffolk County
A source’s classification is the size band its potential emissions put it in: a major source is large enough to need a Title V operating permit, a synthetic minor has accepted limits to stay below that line, and a minor source sits below it outright.
Inspections in Suffolk County, by year
A compliance evaluation is the on-site or file review a state, local or federal air agency records against a permitted source.
- 2026 inspections 81
- 2025 inspections 123
- 2024 inspections 100
- 2023 inspections 99
- 2022 inspections 47
- 2021 inspections 61
- 2020 inspections 41
- 2019 inspections 66
- 2018 inspections 50
- 2017 inspections 49
Violations in Suffolk County, by year
A high-priority violation is the most serious class of Clean Air Act non-compliance an agency records against a source; a federally reportable violation is the next step down in severity.
Stack tests in Suffolk County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
Inspections in Suffolk County, year by year · Violations in Suffolk County, year by year · Stack tests in Suffolk County, year by year
Other counties in Massachusetts
Every county in the state with at least three sources on file.
- Barnstable County 95
- Berkshire County 104
- Bristol County 484
- Dukes County 7
- Essex County 376
- Franklin County 66
- Hampden County 432
- Hampshire County 93
- Middlesex County 932
- Nantucket County 9
- Norfolk County 365
- Plymouth County 256
- Undetermined County 7
- Worcester County 696
Suffolk County carries 412 of the 4,334 air-emissions sources this register holds in Massachusetts, which places it 5th of 15 in that cohort.
Facilities
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register for Suffolk county, MA. It lists 412 facilities in Suffolk county and 13 major sources.