Technology Transfer Network / NAAQS
Ozone Implementation
Ozone Design Values 1993-95
Note: EPA no longer updates this information, but it may be useful as a reference or resource.Summary
39 Areas > NAAQS (plus 7 more from Table 2)
Of the original 98 Classified Nonattainment Areas:
66 Nonattainment areas are still designated nonattainment in the Federal Register
7 Moderate Areas < NAAQS
23 Marginal Areas < NAAQS
4 Attainment Areas > NAAQS
In total 9 areas designated attainment/unclassifiable in the Federal Register
are violating the NAAQS in 1993-95,
Table 1. Classified Ozone Nonattainment Areas - Air Quality Update, 1993-95
1993-95 1993-95 1995 1995
Clean Air Act A.Q. Average 2nd Daily Estimated
State Nonattainment Area Name Classification Value Est. Exc. Status Max 1-hr Exceedance
AL Birmingham NA Area Marginal 0.127 1.3 V 0.132 4.0
AZ Phoenix Moderate 0.129 1.3 V 0.130 3.0
CA Los Angeles South Coast Air Basin Extreme 0.250 86.2 V 0.234 67.0
CA Monterey Bay Unified NA Area Moderate 0.110 0.7 A 0.110 1.4
CA Sacramento Metro NA Area Severe 15 0.145 3.9 V 0.154 7.2
CA San Diego NA Area Serious 0.146 9.4 V 0.144 9.0
CA San Francisco-Bay NA Area Attainment 0.138 3.3 V N 0.149 2.0
CA San Joaquin Valley NA Area Serious 0.165 31.4 V 0.166 34.5
CA Santa Barbara - Santa Maria - Moderate 0.126 1.7 V 0.130 2.0
CA Southeast Desert Modified AQMD Severe 17 0.196 53.4 V 0.196 26.4
CA Ventura Co NA Area Severe 15 0.157 15.6 V 0.156 22.1
CT Greater Connecticut NA Area Serious 0.153 4.4 V 0.165 8.3
DC-MD-VA Washington NA Area Serious 0.135 2.7 V 0.132 2.5
DE Sussex Co NA Area Marginal 0.111 0.0 A 0.110 0.0
FL Miami-Fort Lauderdale-W. Palm Beach Attainment 0.111 0.0 0.106 0.0
FL Tampa-St. Petersburg-Clearwater Attainment 0.106 0.3 0.109 1.0
GA Atlanta NA Area Serious 0.149 6.0 V 0.147 3.4
IL-IN Chicago-Gary-Lake County NA Area Severe 17 0.133 2.1 V 0.140 2.0
IL Jersey Co NA Area Attainment 0.120 0.7 0.113 0.0
IN Evansville NA Area Marginal 0.114 0.0 A 0.114 0.0
IN Indianapolis NA Area Attainment 0.113 0.0 0.115 0.0
IN South Bend-Elkhart NA Area Attainment 0.108 0.0 0.114 0.0
KY Edmonson Co NA Area Attainment 0.113 0.0 0.118 0.0
KY Huntington-Ashland NA Area Attainment 0.123 1.0 0.123 1.0
KY Lexington-Fayette NA Area Attainment 0.108 0.0 0.110 0.0
KY-IN Louisville NA Area Moderate 0.133 2.7 V 0.132 2.1
KY Owensboro NA Area Attainment 0.114 0.3 0.115 0.0
KY Paducah NA Area Attainment 0.109 0.0 0.108 0.0
LA Baton Rouge NA Area Serious 0.148 1.7 V 0.134 4.0
LA Lake Charles NA Area Marginal 0.123 1.0 A 0.113 1.0
MA-NH Boston-Lawrence-Worcester NA Area Serious 0.130 2.0 V 0.138 2.0
MA Springfield (W. Mass) NA Area Serious 0.131 2.4 V 0.129 2.0
MD Baltimore NA Area Severe 15 0.151 3.3 V 0.153 4.0
MD Kent County and Queen Anne's Co Marginal 0.122 1.0 A 0.122 1.0
ME Hancock Co and Waldo Co NA Area Marginal 0.121 1.0 A 0.121 1.0
ME Knox Co and Lincoln Co NA Area Moderate 0.123 0.8 A 0.123 1.2
ME Lewiston - Auburn NA Area Moderate 0.098 0.0 A 0.091 0.0
ME Portland NA Area Moderate 0.139 2.5 V 0.139 2.5
MI Detroit-Ann Arbor NA Area Attainment 0.129 1.3 V N 0.135 2.0
MI Grands Rapids NA Area Attainment 0.116 0.5 0.117 1.0
MI Muskegon NA Area Moderate 0.141 2.0 V 0.142 4.0
MO-KS Kansas City NA Area Attainment 0.128 1.3 V N 0.134 3.0
MO-IL St. Louis NA Area Moderate 0.147 4.5 V 0.136 4.7
NC Charlotte-Gastonia NA Area Attainment 0.119 1.0 0.118 0.0
NC Greensboro-Winston-Salem-High Point Attainment 0.114 0.3 0.117 1.0
NC Raleigh-Durham NA Area Attainment 0.113 0.0 0.109 0.0
NH Manchester NA Area Marginal 0.086 0.0 A 0.082 0.0
NH Portsmouth-Dover-Rochester, NH Serious 0.130 1.7 V 0.130 3.1
NJ Atlantic City NA Area Moderate 0.115 0.0 A 0.116 0.0
NM Sunland Park, NM NA Area Marginal 0.136 3.1 V 0.135 3.1
NV Reno Marginal 0.090 0.0 A 0.083 0.0
NY Albany-Schenectady-Troy NA Area Marginal 0.109 0.3 A 0.106 0.0
NY Buffalo-Niagara Falls NA Area Marginal 0.102 0.0 A 0.106 0.0
NY Essex Co NA Area Marginal 0.101 0.0 A 0.103 0.0
NY Jefferson Co NA Area Marginal 0.108 0.3 A 0.113 1.0
NY-NJ-CT New York-N. New Jersey-Long Island Severe 17 0.165 5.7 V 0.150 5.0
NY Poughkeepsie NA Area Moderate 0.127 1.7 V 0.127 2.0
OH Canton NA Area Attainment 0.109 0.3 0.120 0.0
OH-KY Cincinnati-Hamilton NA Area Moderate 0.128 1.3 V 0.133 2.0
OH Cleveland-Akron-Lorain NA Area Attainment 0.118 0.0 0.119 0.0
OH Columbus NA Area Attainment 0.107 0.3 0.108 1.0
OH Dayton-Springfield NA Area Attainment 0.122 0.8 0.123 1.0
OH Toledo NA Area Attainment 0.119 0.3 0.111 0.0
OR-WA Portland-Vancouver AQMA NA Area Marginal 0.108 0.3 A 0.108 0.0
PA-NJ Allentown-Bethlehem-Easton NA Area Marginal 0.116 0.0 A 0.116 0.0
PA Altoona NA Area Marginal 0.106 0.0 A 0.112 0.0
PA Erie NA Area Marginal 0.107 0.0 A 0.105 0.0
PA Harrisburg-Lebanon-Carlisle NA Area Marginal 0.118 0.0 A 0.113 0.0
PA Johnstown NA Area Marginal 0.100 0.0 A 0.101 0.0
PA Lancaster NA Area Marginal 0.118 0.7 A 0.124 1.0
PA-NJ-DE Philadelphia-Wilmington-Trenton Severe 15 0.146 3.5 V 0.146 4.3
PA Pittsburgh-Beaver Valley NA Area Moderate 0.133 3.0 V 0.138 7.0
PA Reading NA Area Moderate 0.114 0.3 A 0.116 0.0
PA Scranton-Wilkes-Barre NA Area Marginal 0.110 0.0 A 0.110 0.0
PA York NA Area Marginal 0.115 0.0 A 0.097 0.0
PA-OH Youngstown-Warren-Sharon NA Area Marginal* 0.112 0.0 A 0.113 0.0
RI Providence (all of RI) NA Area Serious 0.135 1.8 V 0.136 3.0
SC Cherokee Co NA Area Attainment 0.106 0.0 0.106 0.0
TN Knoxville NA Area Attainment 0.119 0.0 0.120 0.0
TN Memphis NA Area Attainment 0.128 2.0 V N 0.136 6.0
TN Nashville NA Area Attainment 0.124 1.0 0.124 0.0
TX Beaumont-Port Arthur NA Area Moderate 0.139 1.8 V 0.149 5.3
TX Dallas-Fort Worth NA Area Moderate 0.140 4.1 V 0.145 6.0
TX El Paso NA Area Serious 0.134 2.3 V 0.126 3.1
TX Houston-Galveston-Brazoria NA Area Severe 17 0.189 11.4 V 0.204 19.6
UT Salt Lake City-Ogden NA Area Moderate 0.113 0.3 A 0.115 1.0
VA Norfolk-Virginia Beach-Newport Marginal 0.122 1.0 A 0.113 0.0
VA Richmond-Petersburg NA Area Moderate 0.124 0.7 A 0.124 1.0
VA Smyth County NA Area Marginal ND ND ND ND
WA Seattle - Tacoma NA Area Attainment 0.109 0.7 0.099 0.0
WI Door Co NA Area Marginal 0.121 1.0 A 0.121 1.0
WI Kewaunee Co NA Area Attainment 0.120 1.0 0.120 1.0
WI Manitowoc Co NA Area Moderate 0.126 1.5 V 0.122 1.0
WI Milwaukee-Racine NA Area Severe 17 0.127 1.7 V 0.127 4.0
WI Sheboygan NA Area Attainment 0.119 0.7 0.122 1.0
WI Walworth Co NA Area Attainment 0.099 0.0 0.100 0.0
WV Charleston NA Area Attainment 0.110 0.0 0.111 0.0
WV Greenbrier NA Area Attainment 0.104 0.0 0.104 0.0
WV Parkersburg NA Area Attainment 0.121 0.3 0.122 0.0
Table 2. Additional Areas With Average Estimated Exceedances Greater than 1.0 for 1993-95
1993-95 1993-95 1995 1995
Clean Air Act A.Q Average 2nd Daily Estim.
STATE AREA NAME CLASSIFICATION Value Est.Exc. Status Max 1-hr Exc.
Currently Designated Nonattainment
CA Imperial County Transitional 0.180 12.1 V 0.205 8.0
MI Allegan County Inc. Data 0.135 1.7 V 0.145 4.0
Previously Nonattainment - Redesignated to Attainment
LA LaFourche Parish Attainment 0.127 1.4 V N 0.141 4.3
Always Desginated Attainment/Unclassifiable
IN La Porte County Unclassifiable 0.131 2.4 V N 0.149 6.1
IN Warrick County Unclassifiable 0.131 1.7 V N 0.115 1.0
MI Mason County Unclassifiable 0.125 1.4 V N 0.125 2.1
TX Gregg County Unclassifiable 0.142 1.8 V N 0.145 4.2
NOTES:
Status
V = Area violating the NAAQS (Expected Exceedance > 1.0).
A = Area designated nonattainment, but not violating the NAAQS.
N = Area has been redesignated from nonattainment to attainment or has always been unclassifiable,
but violating the NAAQS.
Blank = Area is designated attaiment and not violating the NAAQS.
SOURCE:EPA's air quality data system, the Aerometric Information Retrieval System (AIRS),
with supplemental data from EPA Regional Offices.
A.Q. Value is in parts per million
* - The Youngstown, OH portion of the nonattainment area was redesignated to attainment on
April 1, 1996.
1. Designations and classifications for ozone nonattainment areas as published in the
Federal Register, 40 CFR Part 81. Unclassified and transitional nonattainment areas are
not included in this listing.
2. The updated air quality value is estimated for the 1993-95 period using EPA guidance
for calculating design values(Laxton Memorandum, June 18, 1990). Generally, the fourth
highest monitored value with 3 complete years of data is selected as the updated air
quality value because the standard allows one exceedance for each year. It is important
to note that the 1990 Clean Air Act Amendments required that O3 nonattainment areas be
classified on the basis of the design value at the time the Amendments were passed,
generally the 1987-89 period was used.
3. The National Ambient Air Quality standard for ozone is 0.12 parts per million (ppm)
daily maximum 1-hour average not to be exceeded more than once per year on average. The
average estimated number of exceedances column shows the number of days the 0.12 ppm
standard was exceeded on average at the site recording the highest updated air quality
value. This is done after adjustment for incomplete, or missing days, during the 3-year
period, 1993-95. The last two columns contain data from the site recording the highest
second daily maximum 1-hour concentration in 1995. The last column shows the estimated
exceedances for 1995 at the site recording the highest second maximum 1-hour concentration
listed in the previous column.
4. Data from a special purpose monitoring (SPM) site operating in Phoenix during the
ozone monitoring season is shown for 1995.
5. The site in Smyth County, VA was located atop Whitetop Mountain as part of the
Mountain Cloud Study. No data reported after 1988. This rural transport nonattainment
area is that portion of Whitetop Mountain above 4500 feet elevation.
6. Calculation of estimated exceedances in Wisconsin nonattainment areas is adjusted to
account for the shorter Wisconsin ozone season not yet reflected in AIRS.
7. Imperial county, CA, site is 1/2 mile north of the border with Mexico.
8. La Porte county, IN, site established as part of the Lake Michigan Ozone Study (LMOS).
9. Warrick county, IN, site is privately operated PSD monitoring site.
February 1997 - Report generated from December 20, 1996 Trends Report by Warren Freas