SIP Status Reports

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Status of Wyoming Designated Areas

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NOTE: As of 03/12/2021, these reports are no longer being updated.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

Wyoming CO (1971) Areas Return to map
No designated areas for this pollutant.
Wyoming Lead (1978) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming Lead (2008) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming NO2 (1971) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming Ozone-1Hr (1979) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming Ozone-8Hr (1997) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming 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 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
Upper Green River Basin Area	Nonattainment	07/20/2012	Marginal	11,498	2017-2019	0.072	Yes	3 / 1	06/03/2016 81 FR 26697
Wyoming Ozone-8Hr (2015) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming 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
Sheridan County; City of Sheridan	Maintenance	11/15/1990	Moderate	17,300	2017-2019	0.0	Yes	3 / 3		06/02/2017	05/04/2018 83 FR 14373
Wyoming PM-2.5 (1997) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming PM-2.5 (2006) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming PM-2.5 (2012) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming SO2 (1971) Areas Return to map Top of page
No designated areas for this pollutant.
Wyoming 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.