SIP Status Reports

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Status of Maine Designated Areas

Maine 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NOTE: As of 03/12/2021, these reports are no longer being updated.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 Maine 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)

Maine CO (1971) Areas Return to map
No designated areas for this pollutant.
Maine Lead (1978) Areas Return to map Top of page
No designated areas for this pollutant.
Maine Lead (2008) Areas Return to map Top of page
No designated areas for this pollutant.
Maine NO2 (1971) Areas Return to map Top of page
No designated areas for this pollutant.
Maine 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
Hancock County and Waldo County Area	Maintenance (NAAQS revoked)	11/15/1990	Marginal	93,204	2017-2019	0.088	Yes	4 / 4		05/13/1996	04/27/1997 62 FR 9081
Knox County and Lincoln County Area	Nonattainment (NAAQS revoked)	11/15/1990	Moderate	74,193	2017-2019	0.080	Yes	21 / 21
Lewiston-Auburn Area	Nonattainment (NAAQS revoked)	11/15/1990	Moderate	229,853	2017-2019	0.074	Yes	22 / 22
Portland Area	Nonattainment (NAAQS revoked)	11/15/1990	Moderate	514,098	2017-2019	0.089	Yes	21 / 21
OTR 1990								6 / 6
OTR								13 / 13
Maine 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
Hancock, Knox, Lincoln and Waldo Counties (Central Maine Coast) Area	Maintenance (NAAQS revoked)	06/15/2004	Former Subpart 1	97,265	2017-2019	0.069	Yes	4 / 0		08/03/2006	01/10/2007 71 FR 71489
Portland Area	Maintenance (NAAQS revoked)	06/15/2004	Subpart 2/Marginal	481,641	2017-2019	0.064	Yes	3 / 2		08/03/2006	01/10/2007 71 FR 71489
OTR								46 / 46
Maine 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 / 46
Maine 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 / 0
Maine PM-10 (1987) 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	Average Estimated Exceedances (est. exc.) (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
Aroostock County; City of Presque Isle	Maintenance	11/15/1990	Moderate	972	2017-2019		Insufficient Data	3 / 3		06/07/1994	10/30/1995 60 FR 45056
Maine PM-2.5 (1997) Areas Return to map Top of page
No designated areas for this pollutant.
Maine PM-2.5 (2006) Areas Return to map Top of page
No designated areas for this pollutant.
Maine PM-2.5 (2012) Areas Return to map Top of page
No designated areas for this pollutant.
Maine SO2 (1971) 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/24-Hr (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
AQCR 109-Millinocket	Maintenance	03/03/1978		5,526		/		0 / 0		04/30/1984	07/01/1997 62 FR 24038
Maine SO2 (2010) Areas Return to map Top of page
No designated areas for this pollutant.

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.