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Peak Daily One-Hour Ozone Averages for April 2015

The table below lists the peak daily one-hour ozone concentrations measured in April 2015 in each community where the TCEQ measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

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 using AQI colors
AreaMonitoring SitePOCApril 2015
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 237
Keller C17237
Frisco C31/C680137
Midlothian OFW C52/A137135
Denton Airport South C56/A163/X157139
Arlington Municipal Airport C61133
Dallas North No.2 C63/C679132
Rockwall Heath C69138
Grapevine Fairway C70/A301/X182136
Kaufman C71/A304/X071137
Granbury C73/C681146
Eagle Mountain Lake C75 135
Parker County C76144
Cleburne Airport C77/C682139
Dallas Hinton St. C401/C60/AH161 333
Dallas Executive Airport C402129
Greenville C1006/A198139
Pilot Point C1032139
Italy C1044/A323135
Corsicana Airport C1051135
AreaMonitoring SitePOCApril 2015
Longview C19/A127/C644244
Tyler Airport Relocated C82139
Karnack C85/AFHP303144
AreaMonitoring SitePOCApril 2015
El Paso-Juarez
El Paso UTEP C12/A125/X151249
Ascarate Park SE C37/A332/A172/X159145
Chamizal C41/AH126 150
Socorro Hueco C49/F312152
Skyline Park C72150
BRAVO Big Bend C67/C316/C656/C6913 N52
Ivanhoe C414150
AreaMonitoring SitePOCApril 2015
Waco Mazanec C1037134
Temple Georgia C1045143
Killeen Skylark Field C1047147
AreaMonitoring SitePOCApril 2015
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 241
West Orange C9/A141234
Port Arthur West C28/A128/A228140
Hamshire C64/C654139
SETRPC Port Arthur C6281 N38
SETRPC 40 Sabine Pass C640/C1654132
SETRPC Mauriceville 42 C642/C311/C6651 N37
SETRPC 43 Jefferson Co Airport C643137
Nederland High School C1035 139
AreaMonitoring SitePOCApril 2015
Austin Northwest C3/A322243
Audubon C38148
Fayette County C6012 N35
Dripping Springs School C6141 N48
CAPCOG McKinney Roughs C6841 N41
CAPCOG Lake Georgetown C6901 N47
Gorzycki Middle School C16031 N53
Lockhart C16041 N42
CAPCOG San Marcos Staples Road C16751 N42
AreaMonitoring SitePOCApril 2015
Houston East C1/G316237
Houston Aldine C8/AF108/X150 236
Channelview C15/AH115 333
Northwest Harris Co. C26/A110/X154234
Hou.DeerPrk2 C35/235/1001/AFH139FP239136
Seabrook Friendship Park C45139
Houston Bayland Park C53/A146 132
Conroe Relocated C78/A321141
Manvel Croix Park C84137
Clinton C403/C304/AH113 331
Houston North Wayside C405128
Lang C408231
Houston Croquet C409234
Houston Westhollow C410134
Houston Texas Avenue C411131
Park Place C416134
Sheldon C5511 N30
Baytown Wetlands Center C5521 N25
Crosby Library C5531 N33
West Houston C5541 N30
La Porte Sylvan Beach C5561 N39
Mercer Arboretum C5571 N31
Tom Bass C5581 N31
Katy Park C5591 N28
Atascocita C5601 N31
Bunker Hill Village C5621 N30
Huffman Wolf Road C5631 N37
HRM-3 Haden Road C603/A114 1 N35
Wallisville Road C617 1 N41
Danciger C618 1 N39
Mustang Bayou C619 1 N42
Texas City 34th St. C620 1 N42
UH Moody Tower C6951 N37
U of H-Sugarland C6961 N32
UH Coastal Center C6971 N33
UH WG Jones Forest C6981 N39
UH West Liberty C6991 N42
Lynchburg Ferry C1015/A165 137
Lake Jackson C1016 138
Baytown Garth C1017141
Galveston 99th St. C1034/A320/X183144
AreaMonitoring SitePOCApril 2015
San Antonio
San Antonio Northwest C23243
Camp Bullis C58148
Calaveras Lake C59138
Elm Creek Elementary C5011 N40
Fair Oaks Ranch C5021 N46
Bulverde Elementary C5031 N44
New Braunfels Airport C5041 N41
City of Garden Ridge C5051 N47
Seguin Outdoor Learning Center C5061 N39
Heritage Middle School C6221 N38
CPS Pecan Valley C6781 N37
AreaMonitoring SitePOCApril 2015
Corpus Christi-Victoria
Corpus Christi West C4240
Corpus Christi Tuloso C21136
Victoria C87139
Aransas Pass C6591 N40
Holly Road C6601 N35
Violet C6641 N33
Ingleside C6851 N37
Odem C6861 N35
Taft C6871 N36
AreaMonitoring SitePOCApril 2015
Lower Rio Grande Valley
Mission C43/AP143132
Brownsville C80/AGP180135
Harlingen Teege C1023132
AreaMonitoring SitePOCApril 2015
Laredo Vidaurri C44/AFGP144/P244134
 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.