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1-Hour Ozone (1979) Nonattainment Area Area/State/County Report - NAAQS Revoked
1-Hour Ozone (1979) Nonattainment Area Area/State/County Report - NAAQS Revoked
Data is current as of March 31, 2024| Albany-Schenectady-Troy, NY (Marginal - Nonattainment) | |
| NEW YORK (Region II) | |
| Albany County | |
| Greene County | |
| Montgomery County | |
| Rensselaer County | |
| Saratoga County | |
| Schenectady County | |
| Allentown-Bethlehem-Easton, PA-NJ (Marginal - Nonattainment) | |
| NEW JERSEY (Region II) | |
| Warren County | |
| PENNSYLVANIA (Region III) | |
| Carbon County | |
| Lehigh County | |
| Northampton County | |
| Altoona, PA (Marginal - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Blair County | |
| Atlantic City, NJ (Moderate - Nonattainment) | |
| NEW JERSEY (Region II) | |
| Atlantic County | |
| Cape May County | |
| Baltimore, MD (Severe-15 - Nonattainment) | |
| MARYLAND (Region III) | |
| Anne Arundel County | |
| Baltimore County | |
| Baltimore city | |
| Carroll County | |
| Harford County | |
| Howard County | |
| Baton Rouge, LA (Severe-15 - Nonattainment) | |
| LOUISIANA (Region VI) | |
| Ascension Parish | |
| East Baton Rouge Parish | |
| Iberville Parish | |
| Livingston Parish | |
| West Baton Rouge Parish | |
| Beaumont-Port Arthur, TX (Serious - Nonattainment) | |
| TEXAS (Region VI) | |
| Hardin County | |
| Jefferson County | |
| Orange County | |
| Boston-Lawrence-Worcester (E. Mass), MA-NH (Serious - Nonattainment) | |
| MASSACHUSETTS (Region I) | |
| Barnstable County | |
| Bristol County | |
| Dukes County | |
| Essex County | |
| Middlesex County | |
| Nantucket County | |
| Norfolk County | |
| Plymouth County | |
| Suffolk County | |
| Worcester County | |
| NEW HAMPSHIRE (Region I) | |
| Hillsborough County (P) | |
| Rockingham County (P) | |
| Buffalo-Niagara Falls, NY (Marginal - Nonattainment) | |
| NEW YORK (Region II) | |
| Erie County | |
| Niagara County | |
| Cheshire County, NH (Incomplete Data - Nonattainment) | |
| NEW HAMPSHIRE (Region I) | |
| Cheshire County | |
| Chicago-Gary-Lake County, IL-IN (Severe-17 - Nonattainment) | |
| ILLINOIS (Region V) | |
| Cook County | |
| DuPage County | |
| Grundy County (P) | |
| Aux Sable Township, Gooselake Township | |
| Kane County | |
| Kendall County (P) | |
| Oswego Township | |
| Lake County | |
| McHenry County | |
| Will County | |
| INDIANA (Region V) | |
| Lake County | |
| Porter County | |
| Chico, CA (Section 185A - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| Butte County | |
| Crawford County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Crawford County | |
| Dallas-Fort Worth, TX (Serious - Nonattainment) | |
| TEXAS (Region VI) | |
| Collin County | |
| Dallas County | |
| Denton County | |
| Tarrant County | |
| Dona Ana County (part); Sunland Park, NM (Marginal - Nonattainment) | |
| NEW MEXICO (Region VI) | |
| Dona Ana County (P) | |
| El Paso, TX (Serious - Nonattainment) | |
| TEXAS (Region VI) | |
| El Paso County | |
| Erie, PA (Marginal - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Erie County | |
| Essex County; Whiteface Mountain, NY (Rural Transport (Marginal) - Nonattainment) | |
| NEW YORK (Region II) | |
| Essex County (P) | |
| Franklin County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Franklin County | |
| Greater Connecticut, CT (Serious - Nonattainment) | |
| CONNECTICUT (Region I) | |
| Fairfield County (P) | |
| Shelton City | |
| Hartford County | |
| Litchfield County (P) | |
| All cities and townships except: Bridgewater Town, New Milford Town | |
| Middlesex County | |
| New Haven County | |
| New London County | |
| Tolland County | |
| Windham County | |
| Greene County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Greene County | |
| Harrisburg-Lebanon-Carlisle, PA (Marginal - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Cumberland County | |
| Dauphin County | |
| Lebanon County | |
| Perry County | |
| Houston-Galveston-Brazoria, TX (Severe-17 - Nonattainment) | |
| TEXAS (Region VI) | |
| Brazoria County | |
| Chambers County | |
| Fort Bend County | |
| Galveston County | |
| Harris County | |
| Liberty County | |
| Montgomery County | |
| Waller County | |
| Imperial County, CA (Section 185A - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| Imperial County | |
| Jefferson County, NY (Marginal - Nonattainment) | |
| NEW YORK (Region II) | |
| Jefferson County | |
| Johnstown, PA (Marginal - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Cambria County | |
| Somerset County | |
| Juniata County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Juniata County | |
| Knox County and Lincoln County, ME (Moderate - Nonattainment) | |
| MAINE (Region I) | |
| Knox County | |
| Lincoln County | |
| Lancaster, PA (Marginal - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Lancaster County | |
| Lawrence County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Lawrence County | |
| Lewiston-Auburn, ME (Moderate - Nonattainment) | |
| MAINE (Region I) | |
| Androscoggin County | |
| Kennebec County | |
| Los Angeles-South Coast Air Basin, CA (Extreme - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| Los Angeles County (P) | |
| Orange County | |
| Riverside County (P) | |
| San Bernardino County (P) | |
| Manchester, NH (Marginal - Nonattainment) | |
| NEW HAMPSHIRE (Region I) | |
| Hillsborough County (P) | |
| Merrimack County | |
| Rockingham County (P) | |
| Milwaukee-Racine, WI (Severe-17 - Nonattainment) | |
| WISCONSIN (Region V) | |
| Kenosha County | |
| Milwaukee County | |
| Ozaukee County | |
| Racine County | |
| Washington County | |
| Waukesha County | |
| Morongo Band of Mission Indians, CA (Severe-17 - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| Riverside County (P) | |
| New York-N. New Jersey-Long Island, NY-NJ-CT (Severe-17 - Nonattainment) | |
| CONNECTICUT (Region I) | |
| Fairfield County (P) | |
| All cities and townships except Shelton City | |
| Litchfield County (P) | |
| Bridgewater Town, New Milford Town | |
| NEW JERSEY (Region II) | |
| Bergen County | |
| Essex County | |
| Hudson County | |
| Hunterdon County | |
| Middlesex County | |
| Monmouth County | |
| Morris County | |
| Ocean County | |
| Passaic County | |
| Somerset County | |
| Sussex County | |
| Union County | |
| NEW YORK (Region II) | |
| Bronx County | |
| Kings County | |
| Nassau County | |
| New York County | |
| Orange County (P) | |
| Queens County | |
| Richmond County | |
| Rockland County | |
| Suffolk County | |
| Westchester County | |
| Northumberland County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Northumberland County | |
| Philadelphia-Wilmington-Trenton, PA-NJ-DE-MD (Severe-15 - Nonattainment) | |
| DELAWARE (Region III) | |
| Kent County | |
| New Castle County | |
| MARYLAND (Region III) | |
| Cecil County | |
| NEW JERSEY (Region II) | |
| Burlington County | |
| Camden County | |
| Cumberland County | |
| Gloucester County | |
| Mercer County | |
| Salem County | |
| PENNSYLVANIA (Region III) | |
| Bucks County | |
| Chester County | |
| Delaware County | |
| Montgomery County | |
| Philadelphia County | |
| Pike County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Pike County | |
| Portland, ME (Moderate - Nonattainment) | |
| MAINE (Region I) | |
| Cumberland County | |
| Sagadahoc County | |
| York County | |
| Portsmouth-Dover-Rochester, NH (Serious - Nonattainment) | |
| NEW HAMPSHIRE (Region I) | |
| Rockingham County (P) | |
| Strafford County | |
| Poughkeepsie, NY (Moderate - Nonattainment) | |
| NEW YORK (Region II) | |
| Dutchess County | |
| Orange County (P) | |
| Remainder of County | |
| Putnam County | |
| Providence (all of RI), RI (Serious - Nonattainment) | |
| RHODE ISLAND (Region I) | |
| Bristol County | |
| Kent County | |
| Newport County | |
| Providence County | |
| Washington County | |
| Reno, NV (Marginal - Nonattainment) | |
| NEVADA (Region IX) | |
| Washoe County | |
| Sacramento Metro, CA (Severe-15 - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| El Dorado County (P) | |
| (excluding Lake Tahoe Air Basin) | |
| Placer County (P) | |
| (excluding Lake Tahoe Air Basin) | |
| Sacramento County | |
| Solano County (P) | |
| Northeastern portion | |
| Sutter County (P) | |
| Southern portion | |
| Yolo County | |
| Salem, OR (Incomplete Data - Nonattainment) | |
| OREGON (Region X) | |
| Marion County (P) | |
| Salem Area Transportation Study | |
| Polk County (P) | |
| Salem Area Transportation Study | |
| San Francisco-Bay Area, CA (Other - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| Alameda County | |
| Contra Costa County | |
| Marin County | |
| Napa County | |
| San Francisco County | |
| San Mateo County | |
| Santa Clara County | |
| Solano County (P) | |
| Southwestern portion | |
| Sonoma County (P) | |
| Southern portion | |
| San Joaquin Valley, CA (Extreme - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| Fresno County | |
| Kern County (P) | |
| Kings County | |
| Madera County | |
| Merced County | |
| San Joaquin County | |
| Stanislaus County | |
| Tulare County | |
| Schuylkill County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Schuylkill County | |
| Scranton-Wilkes-Barre, PA (Marginal - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Columbia County | |
| Lackawanna County | |
| Luzerne County | |
| Monroe County | |
| Wyoming County | |
| Smyth County; White Top Mountain, VA (Rural Transport (Marginal) - Nonattainment) | |
| VIRGINIA (Region III) | |
| Smyth County (P) | |
| Snyder County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Snyder County | |
| Southeast Desert Modified AQMA, CA (Severe-17 - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| Los Angeles County (P) | |
| Riverside County (P) | |
| San Bernardino County (P) | |
| Springfield (Western MA), MA (Serious - Nonattainment) | |
| MASSACHUSETTS (Region I) | |
| Berkshire County | |
| Franklin County | |
| Hampden County | |
| Hampshire County | |
| Susquehanna County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Susquehanna County | |
| Sussex County, DE (Marginal - Nonattainment) | |
| DELAWARE (Region III) | |
| Sussex County | |
| Ventura County, CA (Severe-15 - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| Ventura County | |
| Warren County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Warren County | |
| Washington, DC-MD-VA (Severe-15 - Nonattainment) | |
| DISTRICT OF COLUMBIA (Region III) | |
| District of Columbia | |
| MARYLAND (Region III) | |
| Calvert County | |
| Charles County | |
| Frederick County | |
| Montgomery County | |
| Prince George's County | |
| VIRGINIA (Region III) | |
| Alexandria city | |
| Arlington County | |
| Fairfax County | |
| Fairfax city | |
| Falls Church city | |
| Loudoun County | |
| Manassas Park city | |
| Manassas city | |
| Prince William County | |
| Stafford County | |
| Wayne County, PA (Incomplete Data - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Wayne County | |
| York, PA (Marginal - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Adams County | |
| York County | |
| Youngstown-Warren-Sharon, OH-PA (PA portion) (Marginal - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Mercer County | |
| Yuba City, CA (Section 185A - Nonattainment) | |
| CALIFORNIA (Region IX) | |
| Sutter County (P) | |
| Northern portion | |
| Yuba County | |
Notes: (P) : A portion of the county is located within the area and was designated nonattainment on June 14, 2005.
* : 5% classification change Sec. 181.(a)(3)
The former 1-hour ozone designations and classifications as of June 15, 2004, are being retained in subpart C of Part 81 for purposes of the anti backsliding provisions of 40 CFR 51.905. 40 CFR 51.905(c) references subpart C of part 81 for the areas affected by the anti-backsliding regulation.
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