EPA Air · stack tests by state and year

Air-emissions stack tests in Massachusetts, 2026

54Stack tests

A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Massachusetts during 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Massachusetts, 2026

Massachusetts, other years

Air-emissions stack tests recorded in Massachusetts, 2026

Date	Facility	Where	Kind	Agency
2026-07-23	MASSPOWER	SPRINGFIELD, CITY OF, Hampden, MA	Pending	State
2026-07-14	BERKSHIRE POWER LLC	AGAWAM, Hampden, MA	Pending	State
2026-06-29	SOUTH HADLEY HIGH SCHOOL	SOUTH HADLEY, Hampshire, MA	Pending	State
2026-06-10	TENNESSEE GAS PIPELINE STATION 261	AGAWAM, Hampden, MA	Pending	State
2026-06-09	CONSTELLATION WEST MEDWAY LLC	MEDWAY, Norfolk, MA	Pending	State
2026-06-09	CONSTELLATION WEST MEDWAY LLC	MEDWAY, Norfolk, MA	Pending	State
2026-06-05	MONOGRAM GOURMET FOODS	WILMINGTON, Middlesex, MA	Pending	State
2026-06-05	MONOGRAM GOURMET FOODS	WILMINGTON, Middlesex, MA	Pending	State
2026-06-03	ST GOBAIN ABRASIVES, INC	WORCESTER, CITY OF, Worcester, MA	Pending	State
2026-06-03	ST GOBAIN ABRASIVES, INC	WORCESTER, CITY OF, Worcester, MA	Pending	State
2026-05-28	BAYSTATE MEDICAL CENTER	SPRINGFIELD, CITY OF, Hampden, MA	Pending	State
2026-05-22	NE RENEWABLE POWER FITCHBURG LLC	WESTMINSTER, Worcester, MA	Pending	State
2026-05-22	NE RENEWABLE POWER FITCHBURG LLC	WESTMINSTER, Worcester, MA	Pending	State
2026-05-11	JOHN S LANE & SONS INC	AMHERST, Hampshire, MA	Pending	State
2026-05-07	IPSWICH MUNICIPAL LIGHT	IPSWICH, Essex, MA	Pending	State
2026-05-05	MASSPORT LOGAN AIRPORT	BOSTON, CITY OF, Suffolk, MA	Pending	State
2026-04-28	JAYBIRD & MAIS INC	LAWRENCE, CITY OF, Essex, MA	Pending	State
2026-04-22	SPECIALTY MINERALS — high-priority violation on file	ADAMS, TOWN OF, Berkshire, MA	Pending	State
2026-04-17	ENTEGRIS INC — high-priority violation on file	BEDFORD, TOWN OF, Middlesex, MA	Pending	State
2026-04-14	UMASS AMHERST CAMPUS	AMHERST, Hampshire, MA	Pending	State
2026-04-14	TENNESSEE GAS PIPELINE STATION 261	AGAWAM, Hampden, MA	Pending	State
2026-04-10	JOHN S LANE & SONS INC	AMHERST, Hampshire, MA	Pending	State
2026-04-10	JOHN S LANE & SONS INC	AMHERST, Hampshire, MA	Pending	State
2026-04-07	STONY BROOK ENERGY CENTER — high-priority violation on file	LUDLOW, TOWN OF, Hampden, MA	Pending	State
2026-04-07	MEDICAL AREA TOTAL ENERGY	BOSTON, CITY OF, Suffolk, MA	Pending	State
2026-04-03	REWORLD HAVERHILL LLC F.K.A. COVANTA HAVERHILL INCORPORATED	HAVERHILL, TOWN OF, Essex, MA	Pending	State
2026-04-01	WTE RECYCLING INCORPORATED	GREENFIELD, Franklin, MA	Pending	State
2026-04-01	WTE RECYCLING INCORPORATED	GREENFIELD, Franklin, MA	Pending	State
2026-04-01	VICINITY ENERGY LLC	BOSTON, CITY OF, Suffolk, MA	Pending	State
2026-03-30	MASSACHUSETTS INSTITUTE OF TECHNOLOGY	CAMBRIDGE, TOWN OF, Middlesex, MA	Pending	State
2026-03-24	BAYSTATE MEDICAL CENTER	SPRINGFIELD, CITY OF, Hampden, MA	Pending	State
2026-03-24	BAYSTATE MEDICAL CENTER	SPRINGFIELD, CITY OF, Hampden, 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
2026-03-13	WHEELABRATOR MILLBURY INC	MILLBURY, Worcester, MA	Pending	State
2026-03-11	WHEELABRATOR MILLBURY INC	MILLBURY, Worcester, MA	Pending	State
2026-03-11	ENTEGRIS INC — high-priority violation on file	BEDFORD, TOWN OF, Middlesex, MA	Pending	State
2026-03-10	SBC ENERGY LLC FKA SOUTHBRIDGE POWER & THERMAL LLC	SOUTHBRIDGE, Worcester, MA	Pending	State
2026-03-03	STONY BROOK ENERGY CENTER — high-priority violation on file	LUDLOW, TOWN OF, Hampden, MA	Pending	State
2026-03-03	STONY BROOK ENERGY CENTER — high-priority violation on file	LUDLOW, TOWN OF, Hampden, MA	Pending	State
2026-02-18	VICINITY ENERGY LLC	BOSTON, CITY OF, Suffolk, MA	Pending	State
2026-02-18	VICINITY ENERGY LLC	BOSTON, CITY OF, Suffolk, MA	Pending	State
2026-02-17	MASSACHUSETTS INSTITUTE OF TECHNOLOGY	CAMBRIDGE, TOWN OF, Middlesex, MA	Pending	State
2026-02-17	MASSACHUSETTS INSTITUTE OF TECHNOLOGY	CAMBRIDGE, TOWN OF, Middlesex, MA	Pending	State
2026-02-10	MARBLEHEAD MUNICIPAL-WILKENS	MARBLEHEAD, TOWN OF, Essex, MA	Pending	State
2026-02-03	TENNESSEE GAS PIPELINE STATION 261	AGAWAM, Hampden, MA	Pending	State
2026-01-28	JAYBIRD & MAIS INC	LAWRENCE, CITY OF, Essex, MA	Pending	State
2026-01-27	ENTEGRIS INC — high-priority violation on file	BEDFORD, TOWN OF, Middlesex, MA	Pending	State
2026-01-21	WHEELABRATOR NORTH ANDOVER INCORPORATED	NORTH ANDOVER, TOWN OF, Essex, MA	Pending	State
2026-01-20	REWORLD HAVERHILL LLC F.K.A. COVANTA HAVERHILL INCORPORATED	HAVERHILL, TOWN OF, Essex, MA	Pending	State
2026-01-20	BAKER COMMODITIES	TEWKSBURY, Middlesex, MA	Pending	State
2026-01-14	SOLUTIA INCORPORATED — high-priority violation on file	SPRINGFIELD, CITY OF, Hampden, MA	Pending	State
2026-01-14	WHEELABRATOR MILLBURY INC	MILLBURY, Worcester, MA	Pending	State
2026-01-05	ERVING PAPER MILLS	ERVING, Franklin, MA	Pending	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.