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

Data is current as of March 31, 2024

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 The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.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 21 22 23 24
/ / Marginal Part 799 56/023
Sheridan County PM-10 (1987) Sheridan County; City of 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 21 22 23 24
/ / 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 21 22 23 24
/ / Marginal Part 452 56/037
Important Notes

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