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EPA's Region 6 Office

Serving: Arkansas, Louisiana, New Mexico, Oklahoma, Texas, and 66 Tribal Nations

Ozone Atlas

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The purpose of this report is to present 1-hour ambient air ozone
data collected in Region 6 over the past ten years.

Table of Contents

Introduction
Revision to NAAQS
Regional Summary
State of Arkansas
State of Louisiana
State of New Mexico
State of Oklahoma
State of Texas
State Charts - Appendix A (1988-1997)
Design Values - Appendix B
MSA - Appendix C

Introduction

Ozone is a secondary pollutant that is not directly emitted into the atmosphere. Rather, it is formed by complex chemical reactions when nitrogen oxides produced by combustion sources react with hydrocarbons in the presence of sunlight to form ozone.

The most favorable meteorological conditions for the formation of ozone occurs with stagnant air conditions resulting from a high pressure system with elevated temperatures and mild to calm wind speeds. These conditions typically occur in the summer months throughout most areas of the United States.

Several main factors which contribute in the production of ozone are:

* The quantity of reactive gases present
* The volume of air available for dilution
* The ambient air temperature
* The amount of sunlight

The major problem with controlling ozone is that it is caused by emissions of hydrocarbons and nitrogen oxides from a wide range of sources which includes:

* Refineries
* Gas stations
* Dry cleaners
* Cars and trucks
* Sources using paints and solvents

Consequently, there is no single mechanism that can be effectively utilized to control the formation of ozone. The Primary (health) and Secondary (welfare) related National Ambient Air Quality Standards (NAAQS) established for ozone are 0.12 parts per million (ppm); however, because of rounding and improvement in instrument sensitivity, 0.125 ppm is the level used to determine an ozone exceedance.


Revision to 1-hour Ozone NAAQS

On July 17, 1997, the EPA announced new national ambient air quality standards (NAAQS) for ground-level ozone. This will replace the previous 1-hour primary ozone standard (health-based) with a new 8-hour standard to protect against longer exposure periods. The EPA also replaced the previously 1-hour secondary standard (welfare-based) with a standard identical to the new 8-hour primary standard.

The EPA set the new 8-hour standard at 0.08 parts per million (ppm) and defined the new standard as a "concentration-based" form. The compliance with the new standard will be based on the 3-year average of the annual 4th-highest daily maximum 8-hour ozone concentration.

The 0.12 ppm 1-hour standard, for most purposes, will remain in effect until the EPA determines that an area has achieved 3 consecutive years of air quality data meeting the 1-hour standard. The purpose of retaining the current 1-hour standard is to ensure a smooth, legal and practical transition to the new 8-hour standard.

At the present, there is no 8-hour ozone ambient air data available in AIRS.


Regional Summary

Region 6 consists of Arkansas, Louisiana, New Mexico, Oklahoma and Texas. The regional nonattainment areas are Baton Rouge and Lake Charles, Louisiana; Beaumont-Port Arthur-Orange, Dallas-Fort Worth-Arlington, El Paso, Houston-Galveston-Brazoria, Texas; and Sunland Park, New Mexico. In 1997, ozone exceedances were reported in all of these urban localities.

The metropolitan areas of Little Rock-North Little Rock, Arkansas; New Orleans, Louisiana; Albuquerque, New Mexico; and Tulsa and Oklahoma City, Oklahoma are designated attainment for ozone.

The first regional ozone exceedance, 0.131 ppm, occurred at 5414 ½ Durant site in the city of Bunker Hill, Harris County, Texas on February 16th. The last , 0.126 ppm, regional ozone exceedance of the year occurred on October 3rd simultaneously at 16822 Kitzman site, Harris County, Texas and at Highway 77 site, Iberville Parish, Louisiana.

The maximum number of ozone exceedances per month, 29, occurred on 4 days in September, 1997. The second greatest number of ozone exceedances, 18, also occurred in September on 6 days.

The largest number of ozone sites exceeding the standard in one day, 10, occurred in Harris County (Houston) on September 27 and 29 respectively. The second largest number of ozone sites exceeding the standard in one day, 8, reported in Harris County (Houston) on September 15th .

Refer to appendix A for figures 1 through 56 and appendix B for ozone design values. Figure 1 shows the number of ozone monitors in Region and in each state. Figure 2 depicts the total number of exceedances in Region and in each state. Figure 3 displays the number of violation days in Region and in each state. The remaining figures show ozone concentrations and total exceedances for monitors in Region.

The remaining discussion will concentrate on ozone trends for states and metropolitan areas as follows:

* State - 1997 data will be reviewed.
* Metropolitan Statistical Area (MSA) - 1988-1997 data will be reviewed.

This report will utilize the MSA to define the boundaries of the metropolitan areas discussed. The MSAs are defined in the Aerometric Information Retrieval System (AIRS) user's guide and listed in appendix C.


Arkansas

Five ozone monitoring sites operated in the State during 1997. One exceedance was recorded at Arkansas sites in 1997. Table 2 summarizes the Arkansas ozone data.

Table 2. Four Highest One-Hour Ozone Concentrations (PPM) and Number of Ozone NAAQS Exceedances Measured at Each Arkansas Monitoring Site Operated in 1997.

Site ID City/County Address 1st 2nd 3rd 4th Exceedances
050350005 Crittenden Loch Pork & Colorado 0.129 0.122 0.118 0.113 1
051190007 Pulaski Pike Ave @ River Rd 0.098 0.097 0.097 0.092 0
051191002 Pulaski Remont Rd North 0.108 0.100 0.099 0.096 0
050970001 Montgomery Forest Ranger St 0.078 0.077 0.077 0.075 0
051010002 Newton Highway 16 0.089 0.088 0.081 0.081 0

Little Rock-North Little Rock MSA

Two ozone monitors operated during the period, 1988-1997. The maximum ozone concentration reported during the 10-year period was 0.141 ppm in 1990 at the Remount Road North in the city of North Little Rock. Figure 4 displays the first and second high ozone concentrations from 1988-1997. Figure 5 shows the total number of ozone exceedances from 1988-1997.

Memphis MSA (Crittenden County)

An ozone monitoring site was established in 1991 at Loch Pork and Colorado location in the city of Marion. The maximum concentration reported at this monitor was 0.140 ppm in 1995. Figure 6 depicts the largest first and second high ozone values from 1988-1997. Figure 7 shows the total number of ozone exceedances from 1988-1997.

Clark County

An ozone monitor operated from 1988 to 1996. This site was located at the DeCray-Lower Dam and measured 0.102 ppm as its highest ozone value in 1989.

Mississippi County

An ozone monitoring site was established in the county during 1991. The highest concentration measured by the ozone monitor at this site was 0.112 ppm in 1991.

Montgomery County

An ozone monitoring site was established in the county during 1991 and continues to operate. The maximum ozone value measured by the ozone monitor at this site was 0.086 ppm in 1994. The location of this monitor is at the Forest Ranger Station.

Newton County

An ozone monitoring site was established in the county on Highway 16 during 1992 and continues to operate. The maximum value measured by the ozone monitor at the site as 0.089 ppm in 1997.


Louisiana

29 ozone monitors operated during 1997. 13 of these sites measured exceedances of the ozone NAAQS. The largest ozone exceedance, 0.162 ppm, was measured at the 2284 Paul Bellow site in Calcasieu Parish. Table 3 summarizes the Louisiana ozone data.

Table 3. Four Highest One-hour Ozone Concentrations (PPM) and Number of Ozone NAAQS Exceedances Measured at Each Louisiana Monitoring Site Operated in 1997.

Site ID City/Parish Address 1st 2nd 3rd 4th Exceedances
220110002 Beauregard Highway 171 0.136 0.117 0.109 0.103 1
220150008 Bossier Shrev Municiple 0.103 0.103 0.101 0.096 0
220170001 Caddo Hagood Rd 0.101 0.099 0.098 0.098 0
220190002 Calcasieu Highway 27 0.152 0.114 0.110 0.107 1
220190008 Calcasieu 2646 John Stine 0.142 0.120 0.108 0.102 1
220330003 East Baton E. End of Aste 0.126 0.120 0.108 0.102 1
220330009 East Baton 1071 Leesville 0.135 0.126 0.122 0.120 2
220331001 East Baton Highway 964 0.132 0.123 0.115 0.115 1
220470002 Iberville Highway 75 0.148 0.120 0.119 0.118 1
220470007 Iberville Highway 77 0.132 0.126 0.126 0.116 3
220511001 Jefferson West Temple Pl 0.104 0.099 0.097 0.097 0
220550005 Lafayette 208 Devalcourt 0.111 0.105 0.098 0.095 0
220570002 LaFourch Co. of Madewood 0.115 0.103 0.103 0.103 0
220630002 Livingston Highway 16 0.131 0.127 0.123 0.107 2
221010003 St. Mary 1300 Lakewood 0.108 0.101 0.099 0.098 0
220710012 Orleans Co. of Florida 0.096 0.088 0.084 0.080 0
220770001 Pointe Coup Ted Davis Res 0.121 0.120 0.111 0.109 0
221210001 West Baton Highway 1 0.119 0.113 0.108 0.100 0
220870002 Saint Bernard Mehle Ave 0.095 0.092 0.087 0.087 0
220930002 Saint James St. James Courth 0.116 0.103 0.102 0.099 0
220730002 Quachita 4709 Construct 0.094 0.089 0.088 0.082 0
220950002 St. John Azalea & South 0.116 0.108 0.104 0.103 0
220890003 St. Charles 1 River Park Dr 0.116 0.108 0.104 0.103 0
220190007 Calcasieu 6439 Hwy 305 0.145 0.128 0.114 0.112 2
220190009 Calcasieu 2284 Paul Bello 0.162 0.122 0.116 0.111 1
220050004 Ascension 11153 Kling Rd 0.136 0.127 0.113 0.109 2
220470009 Iberville 65180 Belleview 0.133 0.120 0.119 0.109 1
220330013 East Baton 11245 Port Huds 0.119 0.105 0.103 0.093 0
220430001 Grant Highway 8 0.099 0.091 0.087 0.087 0

Baton Rouge MSA

Ten ozone monitoring sites were utilized to characterize ambient air quality in the Baton Rouge MSA during the period, 1988-1997. The maximum ozone concentration measured for one-hour during the ten year period was 0.202 ppm in 1990 at 1600 Riverside Road site. Figure 8 depicts the first and second high ozone concentrations from 1988-1997. Figure 9 displays the total number of ozone exceedances from 1988-1997.

Houma-Thibodaux MSA

One site established in 1989 at the Corner of Madewood in the city of Thibodaux continues to operate. The maximum ozone value measured was 0.147 ppm in 1995. Figure 10 shows the first and second high ozone concentrations from 1988-1997. Figure 10A depicts the total number of ozone exceedances from 1988-1997.

Lafayette MSA

Three monitors measured ozone during 1988-1997. The highest ozone 1-hour value measured during the ten-year period was 0.140 ppm in 1992 at 100 Asma Boulevard in the city of Lafayette. Figure 11 displays the largest first and second high ozone values from 1988-1997. Figure 12 shows the total number of exceedances from 1988-1997.

Lake Charles MSA

A total of six ozone monitoring sites monitored the air during the period, 1988-1997. The maximum value reported over the 10-year period was 0.162 ppm in 1997 at the 2284 Paul Bellow site in the city of Vinton. Figure 13 displays the first and second high ozone concentrations from 1988-1997. Figure 14 shows the total number of ozone exceedances from 1988-1997.

Monroe MSA

Two ozone monitors operated from 1988-1997; the maximum ozone value of 0.110 ppm was reported in 1994 at 4709 Construction site in the city of Monroe. Figure 15 displays the first and second high ozone readings from 1988-1997. Figure 16 shows that there has been no exceedances during the 10-year period.

New Orleans MSA

Six ozone monitoring sites operated from 1988-1997. Not all of them were in operation at the same time. During the ten-year period, the maximum ozone value of 0.136 ppm was recorded in 1989 at the West Temple Place site. Figure 17 displays the largest first and second high ozone concentrations from 1988-1997. Figure 18 shows the total number of ozone exceedances from 1988-1997.

Shreveport MSA

Two ozone monitors operated during 1988-1997. The 0.127 ppm was the largest value reported for the entire

10-year period. This value was recorded at the Shreveport Municipal site in the city of Shreveport in 1990. Figure 19 shows the largest first and second high ozone values from 1988-1997. Figure 20 displays the total number of ozone exceedances from 1988-1997.

Beauregard Parish

One ozone site operated during 1989-1997. This monitor was established in 1989 off of Highway 171. The maximum ozone concentration measured by an ozone monitor at this site was 0.136 ppm in 1997.

Grant Parish

An ozone monitoring site operated in Grant Parish from 1989 to 1997, except in 1994. This site was located off of Highway 8 and measured the maximum ozone concentration of 0.103 ppm in 1990.

Iberville Parish

Four ozone monitors operated during 1988-1997. Three sites were the most operating at one time; the Highway 75 site reported the largest ozone value of 0.157 ppm in 1990. Figure 21 shows the largest first and second high ozone values from 1988-1997. Figure 22 displays the total number of ozone exceedances from 1988-1997.

Pointe Coupe Parish

One ozone monitoring site operated in the Parish during the period, 1988-1997. This site was located at Ted Davis residence in the city of New Roads. The highest ozone concentration measured by the monitor at the site was 0.152 ppm in 1990.

St. James Parish

An ozone monitoring site was established at the St. James Courthouse in 1988 and continues to operate. The maximum ozone concentration measured by the ozone monitor at this site was 0.129 ppm in 1995.

St. Mary Parish

One ozone monitoring site operated in the Parish during the period, 1988-1997. This site was established at 1300 Lakewood Drive in the city of Morgan City. The highest ozone concentration measured by the monitor at this site was 0.119 ppm in 1990.


New Mexico

During 1997, seventeen ozone monitors operated. Of these, no site recorded an exceedance of the ozone NAAQS. The maximum value of the year, 0.110 ppm, recorded at the 5935A Valle Vista site in Dona Ana County. Table 4 summarizes the New Mexico ozone data.

Table 4. Four Highest One-Hour Ozone Concentration (ppm) and Number of Ozone NAAQS Exceedances Measured at Each New Mexico Monitoring Site Operated in 1997.

Site ID City/County Address 1st 2nd 3rd 4th Exceedances
350010019 Bernalillo 2421 Mesilla Ave 0.099 0.091 0.087 0.085 0
350010023 Bernalillo 4700A San Mateo 0.094 0.085 0.083 0.083 0
350011003 Bernalillo 4100 Isleta Rd 0.082 0.080 0.079 0.078 0
350011012 Bernalillo 1.4 Miles WSW 0.097 0.085 0.084 0.080 0
350011013 Bernalillo 9819A Second St 0.094 0.089 0.088 0.085 0
350130008 Dona Ana St. Lukes Episcopal 0.091 0.090 0.089 0.088 0
350131012 Dona Ana Holiday Inn 0.080 0.077 0.072 0.071 0
350431001 Sandoval Hwy Department 0.078 0.077 0.077 0.074 0
350611001 Valencia Maintenance Yd 0.067 0.067 0.067 0.066 0
350130017 Dona Ana Sunland Park 0.105 0.097 0.094 0.091 0
350431003 Sandoval 4330 Meadowlark 0.098 0.088 0.088 0.085 0
350130020 Dona Ana 680 McCombs 0.092 0.090 0.090 0.089 0
350130021 Dona Ana 5935A Valle Vista 0.110 0.099 0.094 0.093 0
350130022 Dona Ana 104-2 Santa Tere 0.101 0.097 0.094 0.093 0
350451005 San Juan USBR Shiprock 0.075 0.073 0.071 0.071 0
350011014 Bernalillo 10155 Coors Rd 0.092 0.082 0.079 0.077 0
350130019 Dona Ana Las Cruces Well 0.079 0.074 0.073 0.072 0

Albuquerque MSA

A total of six ozone monitoring sites characterized ozone concentrations during the period, 1988-1997. The maximum concentration monitored over these ten years was 0.111 ppm in 1996 at 2421 Mesilia Avenue in city of Albuquerque. Figure 23 displays the largest first and second high ozone values from 1988-1997. Figure 24 depicts that there has been no exceedances during the 10-year period.

Las Cruces MSA

Only one site monitored ozone during 1988-1997. The largest ozone value measured was 0.110 ppm in 1989 at the Holiday Inn site in the city of Las Cruces. Figure 25 shows the largest first and second high values from 1988-1997. Figure 26 depicts that there has been no exceedances during the 10-year period.

La Union MSA

Only one monitor operated during 1988-1997. The highest ozone concentration reported was 0.125 ppm in 1993 at the St. Lukes Episcopal Church site in Dona Ana County. Figure 27 depicts the largest first and second high concentrations from 1988-1997. Figure 28 shows the total number of ozone exceedances from 1988-1997.

Sunland Park MSA

An ozone monitoring site was established in 1992 at the City Hall. The largest ozone concentration measured by this monitor was 0.140 ppm in 1993. Figure 29 displays the largest first and second high values from 1988-1997. Figure 30 depicts the total number of ozone exceedances from 1988-1997.

Santa Fe MSA

An ozone monitoring site was established in 1989 at the North Side. The largest ozone concentration measured by this monitor was 0.090 ppm, which was measured in 1994. Figure 31 displays the largest first and second high ozone concentrations from 1988-1997. Figure 32 shows the total number of ozone exceedances from 1988-1997.

Sandoval County

Three ozone monitors operated during 1988-1997. Two were the maximum sites during 1993-1997 period. The largest ozone value measured was 0.12 ppm in 1994. This value was reported at the Highway Department location. Figure 33 shows the largest first and second high ozone concentrations from 1988-1997. Figure 34 displays thar there has been no exceedances during the 10-year period.

Valencia County

One site operated during 1988-1997. This monitor located at the Maintenance Yard reported the highest ozone value of 0.09 ppm in 1989. Figure 35 depicts the largest first and second high ozone values from 1988-1997. Figure 36 shows that there has been no exceedances during the 10-year period.


Oklahoma

11 ozone monitoring stations operated in 1997. Only one of these 11 sites exceeded the ozone NAAQS. The maximum yearly concentration, 0.137 ppm, was measured at 900 South Osage in the city of Skiatook, Tulsa County. Table 5 summarizes the Oklahoma ozone data.

Table 5. Four Highest One-Hour Ozone Concentrations (PPM) and Number of Ozone NAAQS Exceedances Measured at Each Oklahoma Monitoring Site Operated in 1997.

Site ID City/County Address 1st 2nd 3rd 4th Exceedances
400870073 McClain Goldsby Tree Farm 0.098 0.092 0.087 0.084 0
400270049 Cleveland Moore Water Tower 0.102 0.095 0.092 0.090 0
401090033 Oklahoma NE 10th & Stone. 0.104 0.103 0.098 0.097 0
401091037 Oklahoma OK Chris. College 0.106 0.100 0.100 0.099 0
401430137 Tulsa 900 South Osage 0.137 0.114 0.101 0.094 1
401430127 Tulsa 1326 Mohawk Blvd 0.100 0.100 0.097 0.095 0
400770440 Latimer Buffalo Mountain 0.100 0.096 0.094 0.091 0
401110152 Okmulgee 8 Miles S. of Gl 0.119 0.094 0.088 0.087 0
401110153 Okmulgee 3/4 Mile NNW 0.093 0.087 0.086 0.086 0
401430174 Tulsa 502 East 144th 0.117 0.105 0.097 0.095 0
400310647 Comanche USPHS Ind. Hosp. 0.025 0.022 0.020 0.020 0

Oklahoma City MSA

Four ozone monitors operated during the period, 1988-1997. The maximum 1-hour ozone concentration measured during the period was 0.136 ppm in 1990 at the Goldsby Tree Farm site in McClain County. Figure 37 depicts the largest first and second high ozone values from 1988-1997. Figure 38 displays the total number of ozone exceedances from 1988-1997.

Tulsa MSA

Three ozone sites operated during the period, 1988-1997. The maximum 1-hour value, 0.149 ppm, was measured in 1995 at the 502 East 144th Street site in the city of Glenpool, Tulsa County. Figure 39 displays the largest first and second high ozone concentrations from 1988-1997. Figure 40 depicts the total number of ozone exceedances from 1988-1997.

Latimer County

One monitor operated during 1997 at the Buffalo Mountain site and reported the 0.100 ppm 1-hour maximum ozone concentration.

Okmulgee County

Two monitors were established in 1997 to measure ozone concentrations in the county. The highest ozone value reported by the monitor located at 8 Miles site was 0.119 ppm.


Texas

Forty-five ozone monitors operated in 1997. 25 of them reported exceedances of the ozone NAAQS. The highest 1-hour ozone value, 0.234 ppm, was measured at the Harris Elementary School in Harris County. The most exceedances in 1997, 15, occurred at the 9726 Monroe Drive site in Harris County. Table 6 summarizes the Texas ozone data.

Table 6. Four Highest One-Hour Ozone Concentrations (PPM) and Number of Ozone NAAQS Exceedances Measured at each Texas Monitoring Site Operated in 1997.

Site ID City/County Address 1st 2nd 3rd 4th Exceedances
481670014 Galveston 8715 Cessna St 0.183 0.170 0.146 0.135 5
484530014 Travis 3700 North Hills 0.092 0.089 0.088 0.087 0
482450009 Jefferson Georgia @ Cunn. 0.154 0.133 0.130 0.124 3
480850005 Collin 6590 Hillcrest Rd 0.134 0.133 0.130 0.128 5
481410044 El Paso 800 S. San Marci 0.121 0.114 0.113 0.108 0
480391003 Brazoria 426 Commerce St 0.152 0.137 0.134 0.124 3
480430101 Brewster Big Bend National 0.065 0.064 0.062 0.061 0
483550025 Nueces Corp Chris St. Sch. 0.097 0.094 0.090 0.089 0
483550026 Nueces 9860 LA Branch 0.091 0.089 0.086 0.080 0
481130045 Dallas 12532 Nuestra Dr 0.114 0.110 0.104 0.100 0
481390015 Ellis 4252 Waterworks 0.118 0.111 0.105 0.105 0
481130069 Dallas 1415 Hinton St 0.132 0.117 0.112 0.110 1
482011039 Harris 5414 ½ Durant 0.214 0.147 0.146 0.141 13
481210054 Denton Quarter Mile Rd 0.129 0.128 0.118 0.118 2
481410027 El Paso 500 North Campell 0.134 0.112 0.106 0.100 1
481410028 El Paso 6950 Alameda Ave 0.123 0.115 0.110 0.110 0
481410037 El Paso Rim Rd 0.128 0.109 0.105 0.093 1
484392003 Tarrant FAA Site, Alta Vista 0.113 0.113 0.109 0.104 0
482010024 Harris Hambrick Jr. Sch. 0.230 0.210 0.169 0.159 12
482010029 Harris 16822 Kitzman 0.168 0.163 0.144 0.126 4
482010046 Harris 7330 N. Wayside 0.189 0.158 0.157 0.151 5
482010047 Harris 4401 Lang Rd 0.158 0.139 0.134 0.131 6
482010051 Harris 13826 Croq. Rd NE 0.172 0.165 0.155 0.155 14
482010059 Harris 7935 1/2 Adrein 0.191 0.176 0.173 0.172 10
482010062 Harris 9726 Monroe Dr 0.197 0.195 0.164 0.158 15
482011035 Harris 9525 Clinton Dr 0.168 0.161 0.147 0.140 8
482011037 Harris 1307 Crawford 0.194 0.174 0.152 0.151 10
481830001 Gregg Gregg Cty Airport 0.139 0.124 0.122 0.117 1
482450011 Jefferson 800 El Vista Rd 0.124 0.123 0.122 0.115 0
480290032 Bexar Eckhert Rd 0.123 0.103 0.101 0.100 0
480290036 Bexar Dellview Park 0.114 0.100 0.099 0.096 0
481671002 Galveston 2701 13th Ave. N. 0.179 0.175 0.126 0.123 3
483611001 Orange Police Station 0.169 0.156 0.109 0.108 2
484690003 Victoria 106 Mockingbird 0.092 0.092 0.088 0.087 0
480610006 Cameron 344 Porter Dr 0.088 0.080 0.076 0.072 0
481210033 Denton 5000 Airport Dr 0.147 0.138 0.135 0.130 5
484391002 Tarrant 3317 Ross Ave 0.139 0.133 0.110 0.108 2
484230004 Smith Tyler Rounds Fie 0.107 0.101 0.098 0.098 0
484790016 Webb W. End Washing 0.092 0.090 0.086 0.075 0
482011034 Harris Harris Elem Sch 0.234 0.198 0.169 0.159 13
482150042 Hidalgo 1902 West Schuni 0.078 0.071 0.070 0.069 0
482150043 Hidalgo 2300 North Glass 0.086 0.078 0.074 0.073 0
484530020 Travis 12200 Lime Creek 0.120 0.112 0.105 0.105 0
482010066 Harris 3333 Hwy 6 South 0.171 0.157 0.155 0.140 8
481130087 Dallas 3277 West Redbird 0.145 0.134 0.125 0.123 3

Austin MSA

Three ozone monitors operated during 1988-1997. The highest ozone concentration, 0.120 ppm was measured in 1988, 1989, 1991 and 1994 at 3700 North Hills and on Parmer Lane sites in the city of Austin. Figure 41 depicts the largest first and second high ozone values from 1988-1997. Figure 42 displays that there has been no exceedances during the 10-year period.

Beaumont-Port Arthur MSA

Four ozone monitors operated at some point during the period, 1988-1997. The most ozone sites operated at any time were four during 1989-1993. The maximum 1-hour concentration, 0.200 ppm, was reported at the Georgia and Cunningham site in the city of Beaumont in 1991. Figure 43 shows the largest first and second high ozone concentrations from 1988-1997. Figure 44 displays the total number of ozone exceedances from 1988-1997.

Brownsville-Harlingen MSA

In 1993, an ozone monitoring site was established at 344 Porter Drive in the city of Brownsville. The highest 1-hour ozone concentration measured at this site was 0.097 ppm in 1994.

Corpus Christi MSA

Two ozone monitoring sites operated during the period,1988-1997. The highest 1-hour ozone value was 0.137 ppm in 1993 at the 9860 La Branch site in the city of Corpus Christi. Figure 45 depicts the largest first and second high ozone values from 1988-1997. Figure 46 displays the total number of ozone exceedances from 1988-1997.

Dallas-Fort Worth-Arlington CMSA

A network of fifteen ozone monitors has been established to characterize the extent of ozone in the CMSA. Not all of them were operating at the same time. The maximum 1-hour ozone measurement, 0.170 ppm, has been measured at the FAA site in Tarrant County in 1991. Figure 47 displays the largest first and second high ozone concentrations from 1988-1997. Figure 48 shows the total number of ozone exceedances from 1988-1997.

El Paso MSA

Four ozone monitoring sites operated during 1988-1997. The maximum 1-hour ozone value measured during the 10-year period was 0.260 ppm at 500 North Campbell in the city of El Paso in 1989. Figure 49 displays the largest first and second high ozone concentrations from 1988-1997. Figure 50 displays the total number of ozone exceedances from 1988-1997.

Houston-Galveston-Brazoria CMSA

A total of twenty-one ozone monitoring sites operated during the period, 1988-1997. Not all of them were monitoring ozone concentrations at the same time. 15 were the maximum monitors operated during 1988, 1990, 1996 and 1997. The highest 1-hour ozone value, 0.270 ppm, was reported at Hambrick Junior High site in Harris County. Figure 51 depicts the largest first and second high ozone values from 1988-1997. Figure 52 displays the total number of ozone exceedances from 1988-1997.

Longview-Marshall MSA

One ozone monitoring site operated during the period, 1988-1997. The highest 1-hour concentration, 0.145 ppm, was measured in 1995 at the Gregg County Airport in Gregg County. Figure 53 shows the largest first and second high ozone values from 1988-1997. Figure 54 displays the total number of ozone exceedances from 1988-1997.

Odessa MSA

No monitor operated in this MSA during 1988-1997.

San Antonio MSA

Two ozone monitors were operating during 1988-1997. The maximum 1-hour ozone concentration, 0.150 ppm was measured in 1988 at Eckhert Road site in the city of San Antonio. Figure 55 depicts the maximum first and second high concentrations from 1988-1997. Figure 56 displays the total number of ozone exceedances from 1988-1997.

Tyler MSA

An ozone monitor was established at Tyler Pounds site in the city of Tyler in 1994. This site continues to operate and measured 0.118 ppm highest 1-hour concentration in 1995.

Brewster County

An ozone monitoring site was located by the National Park Service at Big Bend National Park in 1991. This monitor continues to operate; the highest ozone 1-hour ozone concentration measured at this site was 0.088 ppm which was recorded in 1995.

Culberson County

An ozone monitor was located by the National Park Service at the Guadalupe Mountain in 1987. This site operated until 1992 and measured the largest ozone value, 0.155 ppm in 1987.

Hidalgo County

Two sites were established in 1996 and continue to operate. They were located at 1902 West Schuni and 2300 North Glass. The highest concentration reported was 0.086 ppm at 2300 North Glass site in the city of Mission in 1997.

Webb County

Only one site established at West End of Washington in 1996 and continues to operate. This monitor reported a maximum ozone value of 0.092 ppm.


APPENDIX A - CHARTS

MSA = Metropolitan Statistical Area
CMSA = Consolidated Metropolitan Statistical Area

Number of AR, LA, NM, OK, TX, R6 Ozone Monitors
Number of AR, LA, NM, OK, TX, R6 Ozone Exceedance Days
Number of AR, LA, NM, OK, TX, R6 Violation Days
Little Rock MSA
Memphis MSA
Baton Rouge MSA
Houma-Thibodaux MSA
LaFayette MSA
Lake Charles MSA
Monroe MSA
New Orleans MSA
Shreveport MSA
Iberville Parish
Albuquerque MSA
Las Cruces MSA
La Union MSA
Sunland Park MSA
Santa Fe
Sandoval County
Valencia County
Oklahoma City MSA
Tulsa MSA
Austin MSA
Beaumont-Port Arthur MSA
Corpus Christi MSA
Arlington-Dallas-Fort Worth CMSA
El Paso MSA
Brazoria-Galveston-Houston CMSA
Longview-Marshall MSA
San Antonio MSA


APPENDIX B

Table 7. U. S. EPA Region 6 Ozone Design Value Chart

3-year Period Baton Roug Longview Sunland Park El Paso Dallas
1987-1989 0.164 0.120 - 0.170 0.140
1988-1990 0.168 0.120 - 0.140 0.140
1989-1991 0.168 0.110 - 0.140 0.140
1990-1992 0.149 0.120 - 0.140 0.147
1991-1993 0.128 0.114 - 0.136 0.140
1992-1994 0.135 0.114 0.131 0.136 0.138
1993-1995 0.139 0.142 0.136 0.134 0.139
1994-1996 0.134 0.130 0.135 0.134 0.139
1995-1997 0.131 0.139 0.131 0.126 0.139

3-year Period Houston Beaumont San Antonio Corpus Christi Austin
1987-1989 0.220 0.160 0.120 0.110 0.110
1988-1990 0.220 0.150 0.110 0.110 0.110
1989-1991 0.220 0.150 0.110 0.110 0.110
1990-1992 0.210 0.132 0.100 0.106 0.110
1991-1993 0.180 0.130 0.108 0.110 0.100
1992-1994 0.173 0.124 0.108 0.108 0.099
1993-1995 0.184 0.139 0.119 0.122 0.105
1994-1996 0.188 0.139 0.120 0.115 0.105
1995-1997 0.189 0.139 0.121 0.115 0.104



APPENDIX C

Metropolitan Statistical Area (MSA) Definition

1. LITTLE ROCK-NORTH LITTLE ROCK includes Faulkner, Lonoke, Pulaski and Salina Counties.

2. MEMPHIS includes Crittenden, AR, Shelby and Tipton, TN and DeSoto, MS Counties.

3. BATON ROUGE includes Ascension, East Baton Rouge, Livingston and West Baton Rouge Parishes.

4. HOUMA-THIBODAUX includes LaFourche and Terrebonne Parishes.

5. LAFAYETTE includes Lafayette and St. Martin Parishes.

6. LAKE CHARLES includes Calcasieu Parish.

7. MONROE includes Ouachita Parish.

8. NEW ORLEANS includes Jefferson, Orleans, St. Bernard, St. Charles, St. John the Baptist and St. Tammany Parishes.

9. SHREVEPORT includes Bossier and Caddo Parishes.

10. ALBUQUERQUE includes Bernalillo County.

11. LAS CRUCES includes Dona Ana County (Metropolitan area).

12. La Union includes Dona Ana County.

13. Sunland Park includes Dona Ana County (Southwestern county only).

14. SANTA FE includes Los Alamos and Santa Fe Counties.

15. OKLAHOMA CITY includes Canadian, Cleveland, Logan, McClain, Oklahoma and Pottawatomie Counties.

16. TULSA includes Creek, Osage, Rogers, Tulsa and Wagoner Counties.

17. AUSTIN includes Hays, Travis and Williamson Counties.

18. BEAUMONT-PORT ARTHUR includes Hardin, Jefferson and Orange.

19. BROWNSVILLE-HARLINGEN includes Cameron County.

20. CORPUS CHRISTI includes Nueces and San Patricio Counties.

21. DALLAS-FORT WORTH-ARLINGTON includes Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall and Tarrant Counties.

22. EL PASO includes El Paso County.

23. HOUSTON-GALVESTON-BRAZORIA includes Brazoria, Fort Bend, Galveston, Harris, Liberty, Montgomery and Waller Counties.

24. LONGVIEW-MARSHALL includes Gregg and Harrison Counties

25. ODESSA includes Ector County.

26. SAN ANTONIO includes Bexar, Comal and Guadalupe Counties.

27. TYLER includes Smith County.

Non-metropolitan Statistical Area

1. Clark, Mississippi, Montgomery and Newton Counties in Arkansas.

2. Beauregard, Grant, Iberville, Pointe Coup, St. James and St. Mary Parishes in Louisiana.

3. Sandoval and Valencia Counties in New Mexico.

4. Brewster, Chambers, Culberson, Tyler and Wise Counties in Texas.


Other related Ozone Links:

Oklahoma Department of Environmental Quality
EPA 1998 Ozone Mapping Project
Texas Commission on Environmental Quality

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