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

Data is current as of September 30, 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 The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.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
NEW HAMPSHIRE
Cheshire County	1-Hour Ozone (1979)-NAAQS revoked	Cheshire County, NH	92 93 94 95 96 97 98 99 00 01 02 03 04	/ /	Incomplete Data	Whole	77,117	33/005
Hillsborough County	1-Hour Ozone (1979)-NAAQS revoked	Boston-Lawrence-Worcester (E. Mass), MA-NH	92 93 94 95 96 97 98 99 00 01 02 03 04	/ /	Serious	Part	202,700	33/011
Hillsborough County	1-Hour Ozone (1979)-NAAQS revoked	Manchester, NH	92 93 94 95 96 97 98 99 00 01 02 03 04	/ /	Marginal	Part	198,021	33/011
Hillsborough County	8-Hour Ozone (1997)-NAAQS revoked	Boston-Manchester-Portsmouth (SE), NH	04 05 06 07 08 09 10 11 12	03/04/2013	Moderate	Part	347,992	33/011
Hillsborough County	Carbon Monoxide (1971)	Manchester, NH	92 93 94 95 96 97 98 99 00	01/29/2001	Not Classified	Part	109,565	33/011
Hillsborough County	Carbon Monoxide (1971)	Nashua, NH	92 93 94 95 96 97 98 99 00	01/29/2001	Not Classified	Part	86,494	33/011
Hillsborough County	Sulfur Dioxide (2010)	Central New Hampshire, NH	13 14 15 16 17 18	09/20/2019		Part	17,651	33/011
Merrimack County	1-Hour Ozone (1979)-NAAQS revoked	Manchester, NH	92 93 94 95 96 97 98 99 00 01 02 03 04	/ /	Marginal	Whole	146,445	33/013
Merrimack County	8-Hour Ozone (1997)-NAAQS revoked	Boston-Manchester-Portsmouth (SE), NH	04 05 06 07 08 09 10 11 12	03/04/2013	Moderate	Part	15,013	33/013
Merrimack County	Sulfur Dioxide (2010)	Central New Hampshire, NH	13 14 15 16 17 18	09/20/2019		Part	94,372	33/013
Rockingham County	1-Hour Ozone (1979)-NAAQS revoked	Boston-Lawrence-Worcester (E. Mass), MA-NH	92 93 94 95 96 97 98 99 00 01 02 03 04	/ /	Serious	Part	164,200	33/015
Rockingham County	1-Hour Ozone (1979)-NAAQS revoked	Manchester, NH	92 93 94 95 96 97 98 99 00 01 02 03 04	/ /	Marginal	Part	47,768	33/015
Rockingham County	1-Hour Ozone (1979)-NAAQS revoked	Portsmouth-Dover-Rochester, NH	92 93 94 95 96 97 98 99 00 01 02 03 04	/ /	Serious	Part	83,255	33/015
Rockingham County	8-Hour Ozone (1997)-NAAQS revoked	Boston-Manchester-Portsmouth (SE), NH	04 05 06 07 08 09 10 11 12	03/04/2013	Moderate	Part	286,035	33/015
Rockingham County	Sulfur Dioxide (2010)	Central New Hampshire, NH	13 14 15 16 17 18	09/20/2019		Part	12,430	33/015
Strafford County	1-Hour Ozone (1979)-NAAQS revoked	Portsmouth-Dover-Rochester, NH	92 93 94 95 96 97 98 99 00 01 02 03 04	/ /	Serious	Whole	123,143	33/017
Strafford County	8-Hour Ozone (1997)-NAAQS revoked	Boston-Manchester-Portsmouth (SE), NH	04 05 06 07 08 09 10 11 12	03/04/2013	Moderate	Part	91,516	33/017

Important Notes

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