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Wyoming Nonattainment/Maintenance Status for Each County by Year for All Criteria Pollutants

Data is current as of October 31, 2020

Listed by County, NAAQS, Area. The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.

* The 1997 Primary Annual PM-2.5 NAAQS (level of 15 µg/m3) is revoked in attainment and maintenance areas for that NAAQS. For additional information see the PM-2.5 NAAQS SIP Requirements Final Rule, effective October 24, 2016. (81 FR 58009)

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Important Notes Download National Dataset: dbf   |   xls    |   Data dictionary (PDF)
County NAAQS Area Name Nonattainment in Year Redesignation
to Maintenance
Classification Whole or/
Part County
Population
(2010
)
State/
County
FIPS Codes
WYOMING
Lincoln County 8-Hour Ozone (2008) Upper Green River Basin Area, WY
                                                                                12 13 14 15 16 17 18 19 20
/ / Marginal Part 799 56/023
Sheridan County PM-10 (1987) Sheridan, WY
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17            
05/04/2018 Moderate Part 17,300 56/033
Sublette County 8-Hour Ozone (2008) Upper Green River Basin Area, WY
                                                                                12 13 14 15 16 17 18 19 20
/ / Marginal Whole 10,247 56/035
Sweetwater County 8-Hour Ozone (2008) Upper Green River Basin Area, WY
                                                                                12 13 14 15 16 17 18 19 20
/ / Marginal Part 452 56/037
Important Notes

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