SIP Status Reports
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Status of Washington Designated Areas
Status of Washington Designated Areas
Washington Areas by NAAQSNOTE: As of 03/12/2021, these reports are no longer being updated.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 Washington 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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Washington 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 |
| Seattle-Tacoma Area | Maintenance | 11/15/1990 | Moderate > 12.7ppm | 3,016,710 | 2019 | 1.2 | Yes | 7 / 7 | |
03/04/1996 | 10/11/1996 61 FR 53323 |
| Spokane Area | Maintenance | 11/15/1990 | Serious | 363,834 | 2019 | No Data | 7 / 7 | |
11/29/2004 | 08/29/2005 70 FR 37269 |
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| Vancouver Area: Clark County (part) | Maintenance | 11/15/1990 | Moderate <= 12.7ppm | 400,271 | 2019 | No Data | 5 / 5 | |
03/21/1996 | 10/21/1996 61 FR 54560 |
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| Yakima Area | Maintenance | 11/15/1990 | Not Classified | 69,565 | 2019 | No Data | 1 / 1 | |
08/23/2001 | 12/31/2002 67 FR 66555 |
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Washington Lead (1978) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Washington Lead (2008) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Washington NO2 (1971) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Washington 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 |
| Portland-Vancouver AQMA Area | Maintenance (NAAQS revoked) | 11/15/1990 | Marginal | 410,990 | 2017-2019 | 0.091 | Yes | 4 / 4 | |
06/25/1996 | 06/18/1997 62 FR 27204 |
| Seattle-Tacoma Area | Maintenance (NAAQS revoked) | 01/06/1992 | Marginal | 3,439,810 | 2017-2019 | 0.113 | Yes | 4 / 4 | |
03/04/1996 | 11/25/1996 61 FR 50438 |
Washington Ozone-8Hr (1997) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Washington Ozone-8Hr (2008) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Washington Ozone-8Hr (2015) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Washington PM-10 (1987) 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 |
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 |
| King County; Kent | Maintenance | 11/15/1990 | Moderate | 47,315 | 2017-2019 | No Data | 3 / 3 | 05/14/2001 66 FR 14492 |
08/23/1999 | 05/14/2001 66 FR 14492 |
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| King County; Seattle | Maintenance | 11/15/1990 | Moderate | 661,062 | 2017-2019 | No Data | 3 / 3 | 05/14/2001 66 FR 14492 |
08/23/1999 | 05/14/2001 66 FR 14492 |
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| Pierce County; Tacoma | Maintenance | 11/15/1990 | Moderate | 238,725 | 2017-2019 | No Data | 3 / 3 | 05/14/2001 66 FR 14492 |
08/23/1999 | 05/14/2001 66 FR 14492 |
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| Spokane County; (part) | Maintenance | 11/15/1990 | Moderate | 230,807 | 2017-2019 | 2.0 | No | 3 / 3 | 10/24/2001 66 FR 48808 |
11/30/2004 | 08/30/2005 70 FR 38029 |
| Thurston County; Cities of Olympia, Tumwater, and Lacey | Maintenance | 11/15/1990 | Moderate | 98,562 | 2017-2019 | No Data | 3 / 3 | |
08/16/1999 | 12/04/2000 65 FR 59128 |
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| Walla Walla County; Wallula | Maintenance | 11/15/1990 | Serious | 426 | 2017-2019 | 3.2 | No | 3 / 3 | 11/21/2002 67 FR 64815 |
03/29/2005 | 09/26/2005 70 FR 50212 |
| Yakima County; (part) | Maintenance | 11/15/1990 | Moderate | 69,565 | 2017-2019 | 1.6 | No | 3 / 3 | 03/10/2005 70 FR 6591 |
07/15/2004 | 03/10/2005 70 FR 6591 |
Washington PM-2.5 (1997) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
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Washington PM-2.5 (2006) Areas Return to map Area designated nonattainment for the 24-hour standard 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 24-Hr (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 |
| Tacoma | Maintenance | 12/14/2009 | Moderate | 539,682 | 2017-2019 | 35 | Yes | 6 / 2 | 10/04/2012 77 FR 53772 |
11/04/2014 | 03/12/2015 80 FR 7347 |
Washington PM-2.5 (2012) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Washington SO2 (1971) Areas Return to map Top of page |
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| No designated areas for this pollutant. | |||||||||||
Washington 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. |