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Daily Maximum Eight-Hour Ozone Averages for September 2015

The table below lists the peak daily maximum eight-hour ozone concentrations measured in September 2015 in each community where the TCEQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

Use the selection boxes below to customize this report. You may select a different month, a different year, a different report format, and whether or not to include time on the report. Click on the Generate Report button once you have made your selections.

Month:Year:Report Format: Include time:
Include time
Highlight with AQI colors
AreaMonitoring SitePOCSeptember 2015
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 232
Keller C17243
Frisco C31/C680147
Midlothian OFW C52/A137135
Denton Airport South C56/A163/X157153
Arlington Municipal Airport C61134
Dallas North No.2 C63/C679143
Rockwall Heath C69142
Grapevine Fairway C70/A301/X182145
Kaufman C71/A304/X071140
Granbury C73/C681135
Eagle Mountain Lake C75 142
Parker County C76143
Cleburne Airport C77/C682138
Dallas Hinton St. C401/C60/AH161 340
Dallas Executive Airport C402136
Greenville C1006/A198141
Pilot Point C1032151
Italy C1044/A323134
Corsicana Airport C1051140
AreaMonitoring SitePOCSeptember 2015
Longview C19/A127/C644238
Tyler Airport Relocated C82139
Karnack C85/AFHP303135
AreaMonitoring SitePOCSeptember 2015
El Paso-Juarez
El Paso UTEP C12/A125/X151249
Ascarate Park SE C37/A332/A172/X159147
Chamizal C41/AH126 151
Socorro Hueco C49/F312159
Skyline Park C72158
BRAVO Big Bend C67/C316/C656/C6913 N45
Ivanhoe C414154
AreaMonitoring SitePOCSeptember 2015
Waco Mazanec C1037139
Temple Georgia C1045137
Killeen Skylark Field C1047132
AreaMonitoring SitePOCSeptember 2015
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 219
West Orange C9/A141225
Port Arthur West C28/A128/A228128
Hamshire C64/C654120
SETRPC Port Arthur C6281 N29
SETRPC 40 Sabine Pass C640/C1654123
SETRPC Mauriceville 42 C642/C311/C6651 N24
SETRPC 43 Jefferson Co Airport C643123
Nederland High School C1035 123
AreaMonitoring SitePOCSeptember 2015
Austin Northwest C3/A322237
Audubon C38138
Fayette County C6012 N36
Dripping Springs School C6141 N37
CAPCOG McKinney Roughs C6841 N33
CAPCOG Lake Georgetown C6901 N36
Gorzycki Middle School C16031 N34
Lockhart C16041 N31
CAPCOG San Marcos Staples Road C16751 N38
CAPCOG Hutto College Street C66021 N33
AreaMonitoring SitePOCSeptember 2015
Houston East C1/G316223
Houston Aldine C8/AF108/X150 228
Channelview C15/AH115 321
Northwest Harris Co. C26/A110/X154232
Hou.DeerPrk2 C35/235/1001/AFH139FP239125
Seabrook Friendship Park C45131
Houston Bayland Park C53/A146 130
Conroe Relocated C78/A321140
Manvel Croix Park C84134
Clinton C403/C304/AH113 325
Houston North Wayside C405118
Houston Monroe C406123
Lang C408228
Houston Croquet C409231
Houston Westhollow C410132
Houston Texas Avenue C411124
Park Place C416127
Sheldon C5511 N17
Baytown Wetlands Center C5521 N22
West Houston C5541 N28
La Porte Sylvan Beach C5561 N30
Mercer Arboretum C5571 N21
Tom Bass C5581 N25
Katy Park C5591 N24
Atascocita C5601 N21
Meyer Park C5611 N24
Bunker Hill Village C5621 N27
Huffman Wolf Road C5631 N2
HRM-3 Haden Road C603/A114 1 N23
Danciger C618 1 N26
Mustang Bayou C619 1 N35
Texas City 34th St. C620 1 N37
UH Moody Tower C6951 N31
U of H-Sugarland C6961 N33
UH Coastal Center C6971 N31
UH WG Jones Forest C6981 N34
UH West Liberty C6991 N26
Lynchburg Ferry C1015/A165 123
Baytown Garth C1017125
Galveston 99th St. C1034/A320/X183142
AreaMonitoring SitePOCSeptember 2015
San Antonio
San Antonio Northwest C23241
Camp Bullis C58142
Calaveras Lake C59137
Elm Creek Elementary C5011 N34
Fair Oaks Ranch C5021 N39
New Braunfels Airport C5041 N37
City of Garden Ridge C5051 N34
Seguin Outdoor Learning Center C5061 N38
Heritage Middle School C6221 N37
CPS Pecan Valley C6781 N33
AreaMonitoring SitePOCSeptember 2015
Corpus Christi-Victoria
Corpus Christi West C4240
Corpus Christi Tuloso C21138
Victoria C87143
Inez C6091 N38
Coleto C6241 N29
Holly Road C6601 N35
Ingleside C6851 N37
Odem C6861 N36
Taft C6871 N34
Cuero C16021 N24
AreaMonitoring SitePOCSeptember 2015
Lower Rio Grande Valley
Mission C43/AP143128
Brownsville C80/AGP180118
Harlingen Teege C1023130
AreaMonitoring SitePOCSeptember 2015
Laredo Vidaurri C44/AFGP144/P244132
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

Interpreting the AQI

Air Quality Index

Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA's AirNow web site.

Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.

The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.

AQI Breakpoint Definitions
AQI Range 1hr Ozone
in ppm
8hr Ozone
in ppm
0 - 50 Not Defined 0 - 0.059
51 - 100 Not Defined 0.06 - 0.075
101 - 150 0.125 - 0.164 0.076 - 0.095
151 - 200 0.165 - 0.204 0.096 - 0.115
201 - 300 0.205 - 0.404 0.116 - 0.374
301 - 400 0.405 - 0.504 Not Defined
401 - 500 0.505 - 0.604 Not Defined
500+ Not Defined Not Defined

PLEASE NOTE:  This data has not been verified by the TCEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from TCEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.

Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data beginning 1/1/2013, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.