EPA Air · by county
Air-emissions sources in Middlesex County, Massachusetts
- 932Facilities
Every stationary source in Middlesex 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.
By emissions classification in Middlesex 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 Middlesex 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 124
- 2025 — inspections 190
- 2024 — inspections 185
- 2023 — inspections 106
- 2022 — inspections 63
- 2021 — inspections 100
- 2020 — inspections 103
- 2019 — inspections 132
- 2018 — inspections 127
- 2017 — inspections 169
Facilities
| Facility↑↓ | Classification↑↓ | HPV |
|---|---|---|
| HOLCIM - NER INC | Synthetic minor source | No |
| HOLCIM NER INC | Synthetic minor source | No |
| HOLCIM NER INC | Synthetic minor source | No |
| HOLLAND USED AUTO PARTS | Minor source | No |
| HOLLINGSWORTH & VOSE | Major source | No |
| HOLLISTON HIGH SCHOOL | Minor source | No |
| HOLLYWOOD CLEANERS | Minor source | No |
| HOLT AND BUGBEE COMPANY | Minor source | No |
| HOOD DISTRIBUTION | Synthetic minor source | No |
| HOPKINTON LNG CORP | Major source | No |
| HOPKINTON MIDDLE SCHOOL | Minor source | No |
| HORIZON MILLING LLC | Minor source | No |
| HOWES ENGINEERING CO | Minor source | No |
| HOWLAND DEVELOPMENT | Minor source | No |
| HP INC | No | |
| HUDSON CREEK | Minor source | No |
| HUDSON LIGHT & POWER DEPARTMENT | Major source | No |
| HUDSON LOCK | Minor source | No |
| HUDSON MILL LLC | Minor source | No |
| HUDSON POLY BAG INCORPORATED | Minor source | No |
| HUTCHINSON AEROSPACE & INDUSTRY INC. | Synthetic minor source | No |
| HYNES COLLISION CENTER | Minor source | No |
| HYPERION CATALYSIS | Minor source | No |
| IBM CORP - CAMBRIDGE | Minor source | No |
| IDEAL CONCRETE BLOCK CO | Minor source | No |
| IDENTIX PHARMACEUTICAL INC | Minor source | No |
| IGGYS BREAD OF THE WORLD | Minor source | No |
| INDUSTRIAL CHEMICAL COMPANY | Minor source | No |
| INSCO | Minor source | No |
| INSTRUMENTATION LABORATORY | Minor source | No |
| INSTRUMENTATION LABORATORY | No | |
| INSULET CORPORATION | No | |
| INTEL MASSACHUSETTS INC | Synthetic minor source | No |
| INTELLIA THERAPEUTICS | No | |
| INTERPOLYMER CORP | Minor source | No |
| J KITTREDGE & SONS INC | Minor source | No |
| J&C QUALITY CLEANERS | Minor source | No |
| JACKS USED CARS & PARTS INC | No | |
| JAPENAMELAC CORPORATION | Synthetic minor source | No |
| JEFFERSON PARK APARTMENTS | Minor source | No |
| JG MACLELLAN CONCRETE CO | Minor source | No |
| JG MCLELLAN CONCRETE | Minor source | No |
| JKA AUTOMOTIVE INC | No | |
| JOHN A VOLPE NATIONAL TRANSPORTATION SYSTEMS CENTER | No | |
| JOHN GLENN MIDDLE SCHOOL | Minor source | No |
| JP BARTLETT COMPANY | Synthetic minor source | No |
| JP ROUTHIER & SONS LLC | Minor source | No |
| KANE PERKINS CO INC | No | |
| KEEFE VACATIONAL SCHOOL | Minor source | No |
| KENDALL GREEN ENERGY LLC | Major source | No |
| KENNEDY LOFTS | Minor source | No |
| KENNEDY MIDDLE SCHOOL | Minor source | No |
| KENNEDY SCHOOL | Minor source | No |
| KENNEDY SCHOOL | Minor source | No |
| KENS FOODS INCORPORATED | Minor source | Yes |
| KEURIG DR PEPPER | No | |
| KIDDE FENWAL INCORPORATED | Minor source | No |
| KIDDE-FENWAL INC | No | |
| KILEY JAMES COMPANY | Minor source | No |
| KILLAM SCHOOL | Minor source | No |
| KING 200 CPD LLC | Synthetic minor source | No |
| KING PRINTING CO ONC | Minor source | No |
| KING SCHOOL | Minor source | No |
| KIRWOOD TECH PUBLISH | Minor source | No |
| KONARKA TECHNOLOGIES | Minor source | No |
| KOVALUS SEPARATION SOLUTIONS INC | Synthetic minor source | No |
| KRAFT FOODS | Minor source | No |
| KRAFT FOODS GLOBAL INC | Minor source | No |
| KRAFT POWER CORP | No | |
| KTRON INC | Minor source | No |
| L3 COMMUNICATIONS ESSCO INC | Minor source | No |
| L3 TECHNOLOGIES INC | No | |
| LABCORP BEDFORD LLC | No | |
| LACEY TRUCK EQUIP | Minor source | No |
| LAHEY CLINIC HOSPITAL INC | Synthetic minor source | No |
| LANE SCHOOL | Minor source | No |
| LANNAN CHEVROLET | Minor source | No |
| LANTHEUS MEDICAL IMAGING INC | Synthetic minor source | No |
| LASALLE CLEANERS | Minor source | No |
| LASELL COLLEGE | Minor source | No |
| LAWRENCE MEMORIAL HOSPITAL | Synthetic minor source | No |
| LE MASURIER GRANITE QUARRY | No | |
| LEAVITT CORPORATION THE | Minor source | No |
| LEDGEMONT RESEARCH | Minor source | No |
| LEMAITRE VASCULAR INC | No | |
| LEVEL 3 COMMUNICATIONS | Synthetic minor source | No |
| LEXINGTON HIGH SCHOOL | Minor source | No |
| LIBERTY CHREVOLET | Minor source | No |
| LIBERTY MUTUAL INSURANCE | Minor source | No |
| LIFECYCLE RENEWABLES | Minor source | No |
| LIGHTFORCE ORTHODONTICS | No | |
| LINCOLN ELIOT SCHOOL | Minor source | No |
| LINCOLN SUDBURY HIGH | Minor source | No |
| LISTA INTERNATIONAL CORP | Synthetic minor source | No |
| LITTLETON HIGH SCHOOL | Minor source | No |
| LITTLETON JR HIGH SCHOOL | Minor source | No |
| LITTLETON TOWN HALL | Minor source | No |
| LOCKER ELEMENTARY SCHOOL | Minor source | No |
| LOCKHEED MARTIN CORPORATION | Synthetic minor source | No |
| LOELLA DEWING SCHOOL | Minor source | No |
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.