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Important Notes for the:
Nonattainment Status for Each County by Year Report

This table shows the history of the nonattainment areas from 1992 to the present. Each county which is or has been nonattainment (since 1992) is listed by state then pollutant.

1979 1-hour Ozone areas were revoked on June 15, 2005. 1997 8-hour Ozone areas were revoked on April 6, 2015.

Counties in Revoked NAAQS areas are indicated in the "Pollutant" column with "NAAQS revoked". The Clean Air Act, which was last amended in 1990, requires EPA to set National Ambient Air Quality Standards (40 CFR part 50) for pollutants considered harmful to public health and the environment.

"Nonattainment in Year" refers to the calendar year, and reflects the nonattainment status as of the date of the report. The 1992 starting year is based on 40 CFR Part 81 designations.

The column "Area Name" is the name of the present or past nonattainment area for that pollutant for that county.

The column "Nonattainment in Year" lists the year(s) the county has been nonattainment. For example, "94" means the county was nonattainment sometime from January 1 - December 31, 1994. The field "Redesignation to maintenance" shows the date the county was redesignated to maintenance. Many areas were nonattainment before 1992, but that information is not being shown at this time.

The column "Classification" is the latest classification. The county could have had a different classification in the past.

The column "County NA Part/Whole" indicates whether only a part of the county or the whole county is/was designated nonattainment.

The column "Population (2010)" is the 2010 population for the part or whole county.

The "FIPS St" and "FIPS Co" are the state and county FIPS codes for the listed county.

8-Hour Ozone classified area designations for the 1997 standard were effective on June 15, 2004. Thirteen (13) 8-Hour EAC areas were designated attainment on April 15, 2008. 1997 PM-2.5 area designations were effective on April 5, 2005. 2006 PM-2.5 area designations are effective on December 14, 2009.

On June 8, 2007, the United States Court of Appeals vacated the Subpart 1 portion of the Phase 1 Rule (Court Order) (PDF). On May 14, 2012, the Former Subpart 1 nonattainment areas were classified under Subpart 2 ( 77 FR 28424 (PDF)), effective June 13, 2012.

The following pages detail the changes in the designation status of the nonattainment areas:

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