SIP Status Reports

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Status of New Hampshire Designated Areas

New Hampshire Areas by NAAQS
NOTE: As of 03/12/2021, these reports are no longer being updated. For the latest information, see the SIP Status Tools.

Jump to New Hampshire section for: CO (1971) Lead (1978) Lead (2008) NO2 (1971) Ozone-1Hr (1979) Ozone-8Hr (1997) Ozone-8Hr (2008) Ozone-8Hr (2015) PM-10 (1987) PM-2.5 (1997) PM-2.5 (2006) PM-2.5 (2012) SO2 (1971) SO2 (2010)

New Hampshire CO (1971) Areas Return to map
Click on the Area name to view SIP Required Elements Area	Status	Designation Date	Classification	2010 Population (state portion)	Meets NAAQS Basis	Design Value Annual (ppm) (entire area)	Meets NAAQS	SIP Requirements Original/ Approved	Clean Air Determination Citation Effective Date Click to view FR notice	Redesignation Request Date	Redesignation Citation Effective Date Click to view FR notice
Manchester Area	Maintenance	11/15/1990	Not Classified	109,565	2019		No Data	0 / 0		02/02/1999	01/29/2001 65 FR 71060
Nashua Area	Maintenance	11/15/1990	Not Classified	86,494	2019		No Data	0 / 0		02/01/1999	01/29/2001 65 FR 71060
New Hampshire Lead (1978) Areas Return to map Top of page
No designated areas for this pollutant.
New Hampshire Lead (2008) Areas Return to map Top of page
No designated areas for this pollutant.
New Hampshire NO2 (1971) Areas Return to map Top of page
No designated areas for this pollutant.
New Hampshire Ozone-1Hr (1979) Areas Return to map Top of page
Click on the Area name to view SIP Required Elements Area	Status	Designation Date	Classification	2010 Population (state portion)	Meets NAAQS Basis	Design Value Annual (ppm) (entire area)	Meets NAAQS	SIP Requirements Original/ Approved	Clean Air Determination Citation Effective Date Click to view FR notice	Redesignation Request Date	Redesignation Citation Effective Date Click to view FR notice
Boston-Lawrence-Worcester Area	Nonattainment (NAAQS revoked)	11/15/1990	Serious	366,900	2017-2019	0.095	Yes	26 / 26	06/28/2012 77 FR 31496
Manchester Area	Nonattainment (NAAQS revoked)	11/15/1990	Marginal	392,234	2017-2019	0.076	Yes	4 / 4	11/29/2012 77 FR 65625
Portsmouth-Dover-Rochester Area	Nonattainment (NAAQS revoked)	11/15/1990	Serious	206,398	2017-2019	0.089	Yes	26 / 26	11/29/2012 77 FR 65625
OTR 1990								5 / 5
OTR								13 / 13
New Hampshire Ozone-8Hr (1997) Areas Return to map Top of page
Click on the Area name to view SIP Required Elements Area	Status	Designation Date	Classification	2010 Population (state portion)	Meets NAAQS Basis	Design Value Annual (ppm) (entire area)	Meets NAAQS	SIP Requirements Original/ Approved	Clean Air Determination Citation Effective Date Click to view FR notice	Redesignation Request Date	Redesignation Citation Effective Date Click to view FR notice
Boston-Manchester-Portsmouth (SE) Area	Maintenance (NAAQS revoked)	06/15/2004	Subpart 2/Moderate	740,556	2017-2019	0.065	Yes	53 / 50	04/18/2011 76 FR 14805	03/02/2012	03/04/2013 78 FR 6741
OTR								46 / 46
New Hampshire Ozone-8Hr (2008) Areas Return to map Top of page
Click on the Area name to view SIP Required Elements Area	Status	Designation Date	Classification	2010 Population (state portion)	Meets NAAQS Basis	Design Value (entire area)	Meets NAAQS	SIP Requirements Original/ Approved	Clean Air Determination Citation Effective Date Click to view FR notice	Redesignation Request Date	Redesignation Citation Effective Date Click to view FR notice
OTR								47 / 1
New Hampshire Ozone-8Hr (2015) Areas Return to map Top of page
Click on the Area name to view SIP Required Elements Area	Status	Designation Date	Classification	2010 Population (state portion)	Meets NAAQS Basis	Design Value (entire area)	Meets NAAQS	SIP Requirements Original/ Approved	Clean Air Determination Citation Effective Date Click to view FR notice	Redesignation Request Date	Redesignation Citation Effective Date Click to view FR notice
OTR								46 / 1
New Hampshire PM-10 (1987) Areas Return to map Top of page
No designated areas for this pollutant.
New Hampshire PM-2.5 (1997) Areas Return to map Top of page
No designated areas for this pollutant.
New Hampshire PM-2.5 (2006) Areas Return to map Top of page
No designated areas for this pollutant.
New Hampshire PM-2.5 (2012) Areas Return to map Top of page
No designated areas for this pollutant.
New Hampshire SO2 (1971) Areas Return to map Top of page
No designated areas for this pollutant.
New Hampshire SO2 (2010) Areas Return to map Top of page
Click on the Area name to view SIP Required Elements Area	Status	Designation Date	Classification	2010 Population (state portion)	Meets NAAQS Basis	3 Year 1-⁠Hour Design Value (ppb) (entire area)	Meets NAAQS	SIP Requirements Original/ Approved	Clean Air Determination Citation Effective Date Click to view FR notice	Redesignation Request Date	Redesignation Citation Effective Date Click to view FR notice
Central New Hampshire	Maintenance	10/04/2013		124,453	2017-2019	15	Yes	6 / 6		03/16/2018	09/20/2019 84 FR 49467

We have made our best effort to ensure that the data contained in these reports is accurate. We note that there may be brief delays in updating the reports as we receive new state submissions and we take rulemaking action on plans. In order to assist us in providing accurate information, we request that you contact us by clicking on the "Contact Us" link near the top of this page with any comments regarding or corrections to the posted information, including concerns about whether the entries reflect the most recent status.

Current and historical design value data can be found on the EPA Air Quality Design Values website and the EPA Green Book contains comprehensive nonattainment area, designation status, and historical information.

The level of the 1-hour NAAQS for sulfur dioxide is 75 parts per billion (ppb) calculated as the 3-year average of the 99th percentile of the annual distribution of daily maximum 1-hour average concentrations.