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Mississippi Nonattainment/Maintenance Status for Each County by Year for All Criteria PollutantsData is current as of December 31, 2021
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 The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.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) Important Notes Download National Dataset: dbf | xls | Data dictionary (PDF)
|County||NAAQS||Area Name||Nonattainment in Year||Redesignation
|DeSoto County||8-Hour Ozone (2008)||Memphis, TN-MS-AR||