Table1a. NAA Status 8hr 2008

AQS Data Retrieval: 6/24/2014

Designated Area

EPA 

Region(s)

Designation 

Status1 Classification1

2011-2013 

Design Value 

(ppm)2,3

Meets 

NAAQS?

Most Recent 

Attainment 

Determination 

Action5

Redesignation 

FR Effective 

Date

Allentown-Bethlehem-Easton, PA 3 Nonattainment Marginal 0.074 Yes

Atlanta, GA 4 Nonattainment Marginal 0.080 No

Baltimore, MD 3 Nonattainment Moderate 0.085 No

Baton Rouge, LA 6 Nonattainment Marginal 0.075 Yes 6/16/2014

Calaveras County, CA 9 Nonattainment Marginal 0.072 Yes

Charlotte-Gastonia-Rock Hill, NC-SC 4 Nonattainment Marginal 0.078 No

Chicago-Naperville, IL-IN-WI 5 Nonattainment Marginal 0.082 No

Chico (Butte County), CA 9 Nonattainment Marginal 0.075 Yes

Cincinnati, OH-KY-IN 4,5 Nonattainment Marginal 0.081 No

Cleveland-Akron-Lorain, OH 5 Nonattainment Marginal 0.080 No

Columbus, OH 5 Nonattainment Marginal 0.080 No

Dallas-Fort Worth, TX 6 Nonattainment Moderate 0.087 No

Denver-Boulder-Greeley-Fort Collins-Loveland, CO 8 Nonattainment Marginal 0.083 No

Dukes County, MA 1 Nonattainment Marginal 0.075 Yes

Greater Connecticut, CT 1 Nonattainment Marginal 0.084 No

Houston-Galveston-Brazoria, TX 6 Nonattainment Marginal 0.087 No

Imperial County, CA 9 Nonattainment Marginal 0.082 No

Jamestown, NY 2 Nonattainment Marginal 0.072 Yes

Kern County (Eastern Kern), CA 9 Nonattainment Marginal 0.081 No

Knoxville, TN 4 Nonattainment Marginal 0.074 Yes

Lancaster, PA 3 Nonattainment Marginal 0.075 Yes

Los Angeles & San Bernardino Counties (W Mojave), CA 9 Nonattainment Severe 0.092 No

Los Angeles South Coast Air Basin, CA 9 Nonattainment Extreme 0.107 No

Mariposa County, CA 9 Nonattainment Marginal 0.078 No

Memphis, TN-MS-AR 4,6 Nonattainment Marginal 0.078 No

Morongo Indian Reservation, CA 9 Nonattainment Serious 0.101 No

Nevada County (Western part), CA 9 Nonattainment Marginal 0.077 No

New York-N. New Jersey-Long Island, NY-NJ-CT 1,2 Nonattainment Marginal 0.089 No

Pechanga Indian Reservation, CA 9 Nonattainment Moderate 0.077 No

Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE 2,3 Nonattainment Marginal 0.084 No

Phoenix-Mesa, AZ 9 Nonattainment Marginal 0.081 No

Pittsburgh-Beaver Valley, PA 3 Nonattainment Marginal 0.080 No

Table 1a. Design Values in Areas Previously Designated Nonattainment for the 2008 8-Hour Ozone NAAQS 

Last Updated: 8/1/2014

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Table1a. NAA Status 8hr 2008

Reading, PA 3 Nonattainment Marginal 0.073 Yes

Riverside County (Coachella Valley), CA 9 Nonattainment Severe 0.092 No

Sacramento Metro, CA 9 Nonattainment Severe 0.090 No

San Diego County, CA 9 Nonattainment Marginal 0.080 No

San Francisco Bay Area, CA 9 Nonattainment Marginal 0.071 Yes

San Joaquin Valley, CA 9 Nonattainment Extreme 0.094 No4

San Luis Obispo County (Eastern part), CA 9 Nonattainment Marginal 0.077 No

Seaford, DE 3 Nonattainment Marginal 0.077 No

Sheboygan, WI 5 Nonattainment Marginal 0.085 No

St. Louis-St. Charles-Farmington, MO-IL 5,7 Nonattainment Marginal 0.082 No

Tuscan Buttes, CA 9 Nonattainment Marginal 0.074 Yes

Uinta Basin, UT 8 Unclassifiable Unclassifiable 0.068 See footnote 6

Upper Green River Basin, WY 8 Nonattainment Marginal 0.076 No

Ventura County, CA 9 Nonattainment Serious 0.079 No

Washington, DC-MD-VA 3 Nonattainment Marginal 0.081 No

6. The Uinta Basin, UT area was designated "unclassifiable" based on incomplete data which showed a potential violation of the 2008 8-hour ozone NAAQS. Although a design 

value meeting the NAAQS is listed for this area, there are other monitors in the area with incomplete data which continue to show potential NAAQS violations. Thus, EPA 

cannot make a determination of whether this area meets the NAAQS at this time.

5. Most recent EPA action to determine that either 1) the area has attained the standard by its applicable attainment deadline under section 181(b) of the Clean Air Act, or 2) the 

area has attained the standard under the Clean Data Policy (known informally as a Clean Data Determination).

1. Area designation status and classification as of June 24, 2014.

2. The level of the 2008 8-hour ozone NAAQS is 0.075 parts per million (ppm). The design value is the 3-year average of the annual 4th highest daily maximum 8-hour ozone 

concentration. The design value listed for each area is the highest among monitors with valid design values.

3. The design values shown here are computed using Federal Reference Method or equivalent data reported by State, Tribal, and Local monitoring agencies to EPA's Air Quality 

System (AQS) as of June 24, 2014. Concentrations flagged by State, Tribal, or Local monitoring agencies as having been affected by an exceptional event (e.g., wildfire, 

volcanic eruption) and concurred by the associated EPA Regional Office are not included in these calculations.

4. One or more sites in this area has violated the NAAQS prior to 2011-2013, and does not have a valid 2011-2013 design value. Therefore, the nonattainment area may not 

have a valid design value for some purposes. Although a 2011-2013 design value is shown, this design value may not represent the worst 2011-2013 air quality in the area. 

Consequently, we have not used it to indicate "Yes" or "No" in the "Meets NAAQS?" column, unless there are other sites in the area which show violations.

Notes:

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Table1a. NAA Status 8hr 2008

Disclaimer: The information listed in this report and in these tables is intended for informational use only and does not constitute a regulatory determination by EPA as 

whether an area has attained a NAAQS. The information set forth in this report has no regulatory effect. To have regulatory effect, a final EPA determination as to whether an 

area has attained a NAAQS or attained a NAAQS as of its applicable attainment date can be accomplished only after rulemaking that provides an opportunity for notice and 

comment. No such determination for regulatory purposes exists in the absence of such rulemaking. This report does not constitute a proposed or final rulemaking. 

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