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Massachusetts Nonattainment/Maintenance Status for Each County by Year for All Criteria Pollutants

Data is current as of December 31, 2024

Listed by County, NAAQS, Area. The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.

* The 1997 Primary Annual PM-2.5 NAAQS (level of 15 µg/m³) is revoked in attainment and maintenance areas for that NAAQS. For additional information see the PM-2.5 NAAQS SIP Requirements Final Rule, effective October 24, 2016. (81 FR 58009)

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Important Notes Download National Dataset: dbf | xls | Data dictionary (PDF)

County

NAAQS

Area Name

Nonattainment in Year

Redesignation
to Maintenance

Classification

Whole or/
Part County

Population
(2010)

State/
County
FIPS Codes

MASSACHUSETTS

Barnstable County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

215,888

25/001

Barnstable County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

215,888

25/001

Berkshire County

1-Hour Ozone (1979)-NAAQS revoked

Springfield (Western MA), MA

/ /

Serious

Whole

131,219

25/003

Berkshire County

8-Hour Ozone (1997)-NAAQS revoked

Springfield (W. Mass), MA

/ /

Moderate

Whole

131,219

25/003

Bristol County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

548,285

25/005

Bristol County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

548,285

25/005

Dukes County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

16,535

25/007

Dukes County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

16,535

25/007

Dukes County

8-Hour Ozone (2008)

Dukes County, MA

/ /

Marginal

Whole

16,535

25/007

Essex County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

743,159

25/009

Essex County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

743,159

25/009

Franklin County

1-Hour Ozone (1979)-NAAQS revoked

Springfield (Western MA), MA

/ /

Serious

Whole

71,372

25/011

Franklin County

8-Hour Ozone (1997)-NAAQS revoked

Springfield (W. Mass), MA

/ /

Moderate

Whole

71,372

25/011

Hampden County

1-Hour Ozone (1979)-NAAQS revoked

Springfield (Western MA), MA

/ /

Serious

Whole

463,490

25/013

Hampden County

8-Hour Ozone (1997)-NAAQS revoked

Springfield (W. Mass), MA

/ /

Moderate

Whole

463,490

25/013

Hampden County

Carbon Monoxide (1971)

Springfield, MA

04/22/2002

Not Classified

Part

153,060

25/013

Hampshire County

1-Hour Ozone (1979)-NAAQS revoked

Springfield (Western MA), MA

/ /

Serious

Whole

158,080

25/015

Hampshire County

8-Hour Ozone (1997)-NAAQS revoked

Springfield (W. Mass), MA

/ /

Moderate

Whole

158,080

25/015

Middlesex County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

1,503,085

25/017

Middlesex County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

1,503,085

25/017

Middlesex County

Carbon Monoxide (1971)

Boston, MA

04/01/1996

Moderate <= 12.7ppm

Part

338,206

25/017

Middlesex County

Carbon Monoxide (1971)

Lowell, MA

04/22/2002

Not Classified

Part

106,519

25/017

Middlesex County

Carbon Monoxide (1971)

Waltham, MA

04/22/2002

Not Classified

Part

60,632

25/017

Nantucket County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

10,172

25/019

Nantucket County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

10,172

25/019

Norfolk County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

670,850

25/021

Norfolk County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

670,850

25/021

Norfolk County

Carbon Monoxide (1971)

Boston, MA

04/01/1996

Moderate <= 12.7ppm

Part

92,271

25/021

Plymouth County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

494,919

25/023

Plymouth County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

494,919

25/023

Suffolk County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

722,023

25/025

Suffolk County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

722,023

25/025

Suffolk County

Carbon Monoxide (1971)

Boston, MA

04/01/1996

Moderate <= 12.7ppm

Part

704,526

25/025

Worcester County

1-Hour Ozone (1979)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA-NH

/ /

Serious

Whole

798,552

25/027

Worcester County

8-Hour Ozone (1997)-NAAQS revoked

Boston-Lawrence-Worcester (E. Mass), MA

/ /

Moderate

Whole

798,552

25/027

Worcester County

Carbon Monoxide (1971)

Worcester, MA

04/22/2002

Not Classified

Part

181,045

25/027

Important Notes

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