SIP Status Reports
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Status of North Carolina Designated Areas
Status of North Carolina Designated Areas
North Carolina Areas by NAAQSNOTE: As of 03/12/2021, these reports are no longer being updated. For the latest information, see the SIP Status Tools.
Jump to North Carolina 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)
North Carolina CO (1971) Areas Return to map |
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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 |
Charlotte Area | Maintenance | 11/15/1990 | Not Classified | 919,628 | 2019 | 1.4 | Yes | 1 / 1 | |
10/07/1994 | 09/18/1995 60 FR 39258 |
Raleigh-Durham Area | Maintenance | 01/06/1992 | Moderate <= 12.7ppm | 1,168,580 | 2019 | 1.2 | Yes | 4 / 4 | |
10/07/1994 | 09/18/1995 60 FR 39258 |
Winston-Salem Area | Maintenance | 01/06/1992 | Moderate <= 12.7ppm | 350,670 | 2019 | No Data | 4 / 4 | |
05/02/1994 | 11/07/1994 59 FR 48399 |
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North Carolina Lead (1978) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
North Carolina Lead (2008) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
North Carolina NO2 (1971) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
North Carolina Ozone-1Hr (1979) Areas Return to map Top of page |
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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 |
Charlotte-Gastonia Area | Maintenance (NAAQS revoked) | 11/15/1990 | Moderate | 1,125,714 | 2017-2019 | 0.090 | Yes | 23 / 23 | |
11/12/1993 | 07/05/1995 60 FR 34859 |
Greensboro-Winston-Salem-High Point Area | Maintenance (NAAQS revoked) | 01/06/1992 | Moderate | 1,001,955 | 2017-2019 | 0.079 | Yes | 16 / 16 | |
11/13/1992 | 11/08/1993 58 FR 47391 |
Raleigh-Durham Area | Maintenance (NAAQS revoked) | 01/06/1992 | Moderate | 1,186,305 | 2017-2019 | 0.078 | Yes | 22 / 22 | |
11/13/1992 | 06/17/1994 59 FR 18300 |
North Carolina Ozone-8Hr (1997) Areas Return to map Top of page |
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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 |
Charlotte-Gastonia-Rock Hill Area | Maintenance (NAAQS revoked) | 06/15/2004 | Subpart 2/Moderate | 1,789,799 | 2017-2019 | 0.070 | Yes | 53 / 51 | 04/06/2012 77 FR 13493 |
11/02/2011 | 01/02/2014 78 FR 72036 |
Haywood and Swain Counties (Great Smoky NP) Area | Maintenance (NAAQS revoked) | 06/15/2004 | Former Subpart 1 | 4,273 | 2017-2019 | 0.063 | Yes | 4 / 2 | |
07/24/2009 | 01/06/2010 74 FR 63995 |
Raleigh-Durham-Chapel Hill Area | Maintenance (NAAQS revoked) | 06/15/2004 | Former Subpart 1 | 1,663,630 | 2017-2019 | 0.064 | Yes | 4 / 2 | |
06/07/2007 | 12/26/2007 72 FR 72948 |
Rocky Mount Area | Maintenance (NAAQS revoked) | 06/15/2004 | Former Subpart 1 | 152,392 | 2017-2019 | 0.061 | Yes | 4 / 2 | |
06/19/2006 | 01/05/2007 71 FR 64891 |
North Carolina Ozone-8Hr (2008) Areas Return to map Top of page |
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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 |
Charlotte-Rock Hill | Maintenance | 07/20/2012 | Marginal | 1,723,605 | 2017-2019 | 0.070 | Yes | 3 / 2 | 06/03/2016 81 FR 26697 |
04/16/2015 | 08/27/2015 80 FR 44873 |
North Carolina Ozone-8Hr (2015) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
North Carolina PM-10 (1987) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
North Carolina PM-2.5 (1997) Areas Return to map Top of page |
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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 (µg/m3) (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 |
Greensboro-Winston Salem-High Point | Maintenance (NAAQS revoked) | 04/05/2005 | Former Subpart 1 | 651,284 | 2017-2019 | 8.8 | Yes | 5 / 1 | 01/04/2010 75 FR 54 |
12/18/2009 | 12/19/2011 76 FR 71455 |
Hickory-Morganton-Lenoir | Maintenance (NAAQS revoked) | 04/05/2005 | Former Subpart 1 | 154,358 | 2017-2019 | 8.3 | Yes | 5 / 1 | 01/05/2010 75 FR 230 |
12/18/2009 | 12/19/2011 76 FR 71452 |
North Carolina PM-2.5 (2006) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
North Carolina PM-2.5 (2012) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
North Carolina SO2 (1971) Areas Return to map Top of page |
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No designated areas for this pollutant. | |||||||||||
North Carolina SO2 (2010) Areas Return to map Top of page |
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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. |