SIP Status Reports
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Status of Maryland Designated Areas
Status of Maryland Designated Areas
Maryland Areas by NAAQSNOTE: As of 03/12/2021, these reports are no longer being updated.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 Maryland 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)
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Maryland 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 |
| Baltimore Area | Maintenance | 11/15/1990 | Moderate <= 12.7ppm | 15,455 | 2019 | No Data | 4 / 4 | |
09/20/1995 | 12/15/1995 60 FR 55321 |
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| Washington Area | Maintenance | 11/15/1990 | Moderate <= 12.7ppm | 843,775 | 2019 | 1.9 | Yes | 4 / 4 | |
10/12/1995 | 03/15/1996 61 FR 2931 |
Maryland Lead (1978) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Maryland Lead (2008) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Maryland NO2 (1971) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Maryland 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 |
| Baltimore Area | Nonattainment (NAAQS revoked) | 11/15/1990 | Severe-15 | 2,662,691 | 2017-2019 | 0.100 | Yes | 29 / 28 | 07/12/2012 77 FR 34810 |
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| Kent County and Queen Anne's County Area | Maintenance (NAAQS revoked) | 01/06/1992 | Marginal | 67,995 | 2017-2019 | 0.084 | Yes | 7 / 7 | 03/20/1995 60 FR 3349 |
02/09/2004 | 11/22/2004 69 FR 61766 |
| Philadelphia-Wilmington-Trenton Area | Nonattainment (NAAQS revoked) | 11/15/1990 | Severe-15 | 101,108 | 2017-2019 | 0.102 | Yes | 29 / 28 | 08/25/2008 73 FR 43360 |
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| Washington Area | Nonattainment (NAAQS revoked) | 11/15/1990 | Severe-15 | 2,303,870 | 2017-2019 | 0.096 | Yes | 27 / 26 | 08/25/2008 73 FR 43360 |
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| OTR 1990 | 5 / 5 | |
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| OTR | 13 / 13 | |
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Maryland 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 |
| Baltimore Area | Nonattainment (NAAQS revoked) | 06/15/2004 | Subpart 2/Serious | 2,662,691 | 2017-2019 | 0.075 | Yes | 58 / 55 | 06/25/2015 80 FR 29970 |
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| Kent and Queen Anne's Counties Area | Maintenance (NAAQS revoked) | 06/15/2004 | Subpart 2/Marginal | 67,995 | 2017-2019 | 0.068 | Yes | 3 / 2 | |
05/19/2006 | 01/22/2007 71 FR 76920 |
| Philadelphia-Wilmington-Atlantic City Area | Nonattainment (NAAQS revoked) | 06/15/2004 | Subpart 2/Moderate | 101,108 | 2017-2019 | 0.076 | Yes | 53 / 53 | 04/25/2012 77 FR 17341 |
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| Washington Area | Nonattainment (NAAQS revoked) | 06/15/2004 | Subpart 2/Moderate | 2,303,870 | 2017-2019 | 0.072 | Yes | 53 / 53 | 03/29/2012 77 FR 11739 |
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| OTR | 46 / 46 | |
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Maryland 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 |
| Baltimore | Nonattainment | 07/20/2012 | Moderate | 2,662,691 | 2017-2019 | 0.075 | Yes | 54 / 47 | 09/23/2019 84 FR 44238 |
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| Philadelphia-Wilmington-Atlantic City | Nonattainment | 07/20/2012 | Marginal | 101,108 | 2017-2019 | 0.076 | No | 3 / 2 | 12/04/2017 82 FR 50814 |
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| Washington | Maintenance | 07/20/2012 | Marginal | 2,303,870 | 2017-2019 | 0.072 | Yes | 3 / 3 | 12/14/2017 82 FR 52651 |
02/05/2018 | 05/15/2019 84 FR 15108 |
| OTR | 47 / 45 | |
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Maryland Ozone-8Hr (2015) 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 |
| Baltimore | Nonattainment | 08/03/2018 | Marginal | 2,662,691 | 2017-2019 | 0.075 | No | 3 / 0 | |
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| Philadelphia-Wilmington-Atlantic City | Nonattainment | 08/03/2018 | Marginal | 101,108 | 2017-2019 | 0.076 | No | 3 / 0 | |
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| Washington | Nonattainment | 08/03/2018 | Marginal | 2,303,870 | 2017-2019 | 0.072 | No | 3 / 0 | |
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| OTR | 46 / 0 | |
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Maryland PM-10 (1987) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Maryland 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 |
| Baltimore | Maintenance (NAAQS revoked) | 04/05/2005 | Moderate | 2,662,691 | 2017-2019 | 8.4 | Yes | 6 / 1 | 06/21/2012 77 FR 30208 |
12/23/2013 | 12/16/2014 79 FR 75031 |
| Martinsburg-Hagerstown | Maintenance (NAAQS revoked) | 04/05/2005 | Moderate | 147,430 | 2017-2019 | 8.5 | Yes | 6 / 1 | 02/09/2012 77 FR 1411 |
12/23/2013 | 12/16/2014 79 FR 75035 |
| Washington | Maintenance (NAAQS revoked) | 04/05/2005 | Moderate | 2,215,133 | 2017-2019 | 9.5 | Yes | 6 / 1 | 02/09/2012 77 FR 1411 |
07/17/2013 | 11/05/2014 79 FR 60081 |
Maryland PM-2.5 (2006) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Maryland PM-2.5 (2012) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Maryland SO2 (1971) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Maryland SO2 (2010) 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 |
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 |
| Anne Arundel County and Baltimore County | Nonattainment | 09/12/2016 | 990,333 | 2017-2019 | 10 | 6 / 0 | |
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| 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. |