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Technology Transfer Network / NAAQS
Ozone Implementation

Prior Designation Retained by Operation of Law in 1991 But Without Measured
Violation Based on 1987-89 Data CMSA/MSA/Non-MSA

Information provided for informational purposes onlyNote: EPA no longer updates this information, but it may be useful as a reference or resource.
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Section 185A Ozone Nonattainment Areas Which Were Revoked Without Maintenance Plans

As of July 20, 2000

                                         Design   Average        No.                                                  in a
                                         Value    Expected     Counties   Population         EPA                      CMSA
Areas Listed Alphabetically              (ppm)   Exceedance      NAA       (1,000)          Region     State           MSA
Chico, CA                                0.100       0.0           1           182          9          CA              msa                                                                                                         
Denver-Boulder, CO                       0.122       0.7           6          1709          8          CO              cmsa                                                                                                        
Flint, MI                                0.124       1.0           1           430          5          MI              msa                                                                                                         
Yuba City, CA                            0.120       1.0           2           102          9          CA              msa                                                                                                         
       4 Total Areas                                              10         2,423

    Section 185A areas had 3 complete years of data.  "Section 185A" was previously called "Transitional".  Totals were             
    adjusted to account for multiple areas in a single county.                                                                      

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