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** The 1-hour ozone standard, as well as designations and classifications for all 1-hour ozone nonattainment and maintenance areas,
have been revoked except for the Greensboro, NC, Nashville, TN, and Denver, CO maintenance areas. See details here.
The left column "Area Name" lists the 8-hour ozone area name when there is an 8-hour ozone area.
If there is not an 8-hour area, the 1-hour ozone area name is listed in the "Area Name" column.
8-hour and 1-hour ozone areas are listed only once in the table. Sometimes this does not give
an exact account of what occurred between the 1- and 8-hour areas. Therefore, it is important
to read these footnotes. For easy comparison of 8- and 1-hour ozone areas by county, see the
Currently Designated 8-Hour and Previous 1-Hour Ozone Areas report.
There are a few counties that are split between 8-hour ozone areas:
- Kern Co, CA is split between the San Joaquin (Serious) and Kern Co (Eastern Kern), CA (Subpart 1) 8-hour ozone areas.
The northeastern portion of the county is attainment. The previous 1-hour ozone areas were San Joaquin
(Severe-15) and Kern Co (Eastern Kern) (Serious).
- Los Angeles Co, CA is split between Los Angeles South Coast (Severe 17) and Los Angeles-San Bernardino
Cos (W Mojave), CA (Antelope Valley) (Moderate) 8-hour ozone areas. Both parts make a whole county.
The previous 1-hour ozone areas were Los Angeles South Coast (Extreme) and SE Desert (Severe-17).
- Riverside Co, CA is split between the Los Angeles South Coast (Severe 17) and Riverside Co, (Coachella Valley), CA
(Serious) 8-hour ozone areas. The eastern desert portion of the county is attainment. The previous 1-hour
ozone areas were Los Angeles South Coast (Extreme) and SE Desert (Severe-17). The previous 1-hour ozone
SE Desert (Severe-17) was split into Los Angeles-San Bernardino Cos (W Mojave), CA (Antelope Valley) (Moderate)
and Riverside Co, (Coachella Valley), CA (Serious) 8-hour ozone areas.
- San Bernardino Co, CA is split between Los Angeles South Coast (Severe 17) and Los Angeles-San Bernardino
Cos (W Mojave), CA (Antelope Valley) (Moderate) 8-hour ozone areas.
The previous 1-hour ozone areas were Los Angeles South Coast (Extreme) and SE Desert (Severe-17).
- Solano Co, CA is split between San Francisco (Marginal) and Sacramento (Serious) 8-hour ozone areas.
This is the same as the previous 1-hour area. Both parts make a whole county.
The previous 1-hour ozone areas were San Francisco (Other) and Sacramento (Severe-15).
- Sutter Co, CA is split between the Sutter Co (Sutter Buttes) (Subpart 1) and Sacramento (Serious) 8-hour ozone areas.
The previous 1-hour ozone areas were Yuba City (Section 185A) and Sacramento (Severe-15).
There are a few counties that are split between one or more previous 1-hour ozone nonattainment areas that are now in one
8-hour ozone area:
- Fairfield and Litchfield Cos, CT were in both the New York (Severe-17) and the Greater CT (Serious) previous
1-hour ozone nonattainment areas. Fairfield Co is completely in the New York 8-hour ozone area and
Litchfield Co is completely in the Greater CT 8-hour ozone area.
- Hillsborough Co, NH was in both the Boston-Lawrence-Worcester (E.MA), MA-NH (Serious) and the Manchester, NH (Marginal)
previous 1-hour nonattainment areas, but is now in the Boston-Manchester-Portsmouth (SE) (Moderate) 8-hour ozone
area.
- Rockingham Co, NH was in Boston-Lawrence-Worcester (E. MA), MA-NH (Serious), Manchester, NH (Marginal) and
Portsmouth-Dover-Rochester, NH (Serious) previous 1-hour ozone nonattainment areas, but is now in the
Boston-Manchester-Portsmouth (SE), NH 8-hour ozone area.
- Orange Co, NY was in both the New York-N. New Jersey-Long Island, NY-NJ-CT (Severe-17) and the Poughkeepsie, NY (Moderate)
previous 1-hour ozone nonattainment areas, but is now in the Poughkeepsie, NY (Moderate) 8-hour ozone area.
Due to the fact that this table is structured by area, the following situations are not obvious:
Counties which were part of the 1-hour ozone area, but were not ncluded in the 8-hour ozone area:
- Columbia Co, PA in Scranton-Wilkes-Barre, PA (Marginal)
- Somerset Co, ,PA in Johnstown, PA (Marginal)
- Kennebec Co, ME in Lewiston-Auburn, ME (Moderate)
- Greenup Co, KY in Huntington-Ashland, WY-KY (Moderate)
- Yuba Co and part of Sutter Co, CA in Yuba City, CA (Section 185A) (The only portion of the 1-hour ozone Yuba City area
that is nonattainment for the 8-hour ozone standard is Sutter Buttes.)
Several Counties were moved from a 1-hour ozone area to a different 8-hour ozone area. The following are not obvious from
reading the table:
- Ocean Co, NJ was moved from the 1-hour ozone New York-N. New Jersey-Long Island, NY-NJ-CT (Severe-17) area to the 8-hour
ozone Philadelphia-Wilmin-Atlantic Ci, PA-NJ-MD-DE (Moderate) area.
- Warren Co, NJ was moved from the 1-hour ozone Allentown-Bethlehem-Easton, PA-NJ (Marginal) area to the 8-hour ozone
New York-N. New Jersey-Long Island, NY-NJ-CT (Moderate) area.
- Stafford Co, VA was moved from the 1-hour ozone Washington, DC-MD-VA (Severe-15) area to the 8-hour ozone Fredericksburg, VA
(Moderate) area.
- Middlesex and New Haven Cos were moved from the 1-hour ozone Greater Conneticutt, CT (Serious) area to the 8-hour ozone
New York-N. New Jersey-Long Island, NY-NJ-CT (Moderate) area.
Several counties in New Hampshire and Maine were completely nonattainment for the 1-hour ozone standard, but are only
partially nonattainment for the 8-hour ozone standard.
The following portions of 1-hour ozone areas were designated attainment for the 8-hour ozone standard:
- Boston-Lawrence-Worcester (E. MA), MA-NH (Serious) [Hillsborough Co (part)]
- East Kern Co, CA (Serious) [Indian Wells Valley planning area]
- Hancock & Waldo Cos, ME (Marginal) [part]
- Huntington-Ashland, WV-KY (Moderate*) [Greenup Co (part)]
- Knox & Lincoln Cos, ME (Moderate*) [part]
- Lewiston-Auburn, ME (Moderate*) [Androscoggin Co (part)]
- Manchester, NH (Marginal) [part]
- Phoenix, AZ (Serious) [Gila River Indian tribe area in Maricopa Co]
- Portland, ME (Moderate) [part]
- Portsmouth-Dover-Rochester, NH (Serious) [Strafford Co (part)]
- San Diego, CA (Serious) [4 tribal reservations]
- Scranton-Wilkes-Barre, PA (Marginal) [Columbia Co]
The design value for Boston-Lawrence-Worcester (E. MA), MA was used for the classification
of Boston-Manchester-Portsmouth (SE), NH.
The design value for Washington, DC-MD-VA was used for the classification of Fredericksburg, VA.
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