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Peak Daily One-Hour Ozone Averages for April 2020

The table below lists the peak daily one-hour ozone concentrations measured in April 2020 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 2020
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2444436
Keller C172454837
Frisco C31/C6801504738
Midlothian OFW C52/A1371585744
Denton Airport South C56/A163/X1571474538
Arlington Municipal Airport C611454735
Dallas North No.2 C63/C6791494335
Rockwall Heath C691424134
Grapevine Fairway C70/A301/X1821474838
Kaufman C71/A304/X07114343NA
Granbury C73/C6811483834
Eagle Mountain Lake C75 1494439
Parker County C761524536
Cleburne Airport C77/C6821493929
Dallas Hinton St. C401/C60/AH161 3454237
Dallas Executive Airport C4021534939
Greenville C1006/A1981434130
Pilot Point C10321524537
Italy C1044/A3231464637
Corsicana Airport C10511514341
AreaMonitoring SitePOCApril 2020
Longview C19/A127/C6442464838
Tyler Airport Relocated C821454435
Karnack C85/AFHP3031545546
AreaMonitoring SitePOCApril 2020
El Paso-Juarez
El Paso UTEP C12/A125/X151/G1252514954
Ascarate Park SE C37/A332/A172/X1591565352
Chamizal C41/AH126 1585455
Socorro Hueco C49/F3121505151
Skyline Park C721555357
Ivanhoe C414/F5141535152
AreaMonitoring SitePOCApril 2020
Waco Mazanec C10371534133
Temple Georgia C10451543929
Killeen Skylark Field C10471564031
AreaMonitoring SitePOCApril 2020
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2555749
West Orange C9/A1412565653
Port Arthur West C28/A128/A2281524940
Hamshire C64/C6541565449
SETRPC 40 Sabine Pass C640/C16541525753
SETRPC Mauriceville 42 C642/C311/C6651 N626057
SETRPC 43 Jefferson Co Airport C6431555751
Nederland High School C1035 1515448
AreaMonitoring SitePOCApril 2020
Audubon C381553621
Dripping Springs School C6141 N573526
CAPCOG Lake Georgetown C6901 N5438NA
Lockhart C16041 N573929
St. Edwards University C16051 N513224
CAPCOG Bastrop CAMS16121 N544135
CAPCOG Elgin C16131 N503632
CAPCOG East Austin C16191 N563626
CAPCOG San Marcos Staples Road C16751 N633928
CAPCOG Hutto College Street C66021 N533833
AreaMonitoring SitePOCApril 2020
Houston East C1/G3162544845
Houston Aldine C8/AF108/X150 2645057
Channelview C15/AH115 3474645
Northwest Harris Co. C26/A110/X1542675159
Hou.DeerPrk2 C35/235/1001/AFH139FP2391575149
Seabrook Friendship Park C451494847
Houston Bayland Park C53/A146 1635053
Conroe Relocated C78/A3211585250
Manvel Croix Park C841534747
Clinton C403/C304/AH113 3564746
Houston North Wayside C4051504444
Houston Monroe C406154NA41
Lang C4082594850
Houston Croquet C4092524448
Houston Westhollow C4101604853
Park Place C4161564746
Sheldon C5511 N534745
Baytown Wetlands Center C5521 N545148
Crosby Library C5531 N504443
West Houston C5541 N564243
La Porte Sylvan Beach C5561 N545350
Mercer Arboretum C5571 N584853
Tom Bass C5581 N564851
Katy Park C5591 N594850
Atascocita C5601 N534847
Meyer Park C5611 N665259
Bunker Hill Village C5621 N584547
Huffman Wolf Road C5631 N595048
HRM-3 Haden Road C603/A114 1 N524643
Wallisville Road C617 1 N565351
Texas City 34th St. C620 1 N605754
UH Moody Tower C6951 N605050
UH WG Jones Forest C6981 N585352
UH West Liberty C6991 N644543
Lynchburg Ferry C1015/A165 1524746
Lake Jackson C1016 1545147
Baytown Garth C10171525049
Galveston 99th St. C1034/A320/X1831545351
Oyster Creek C1607 1 N514948
AreaMonitoring SitePOCApril 2020
San Antonio
San Antonio Northwest C232574027
Camp Bullis C58 1623716
Calaveras Lake C591593930
Elm Creek Elementary C5011 N513623
Fair Oaks Ranch C5021 N603824
Bulverde Elementary C5031 N633525
New Braunfels Airport C5041 N543324
City of Garden Ridge C5051 N643628
Seguin Outdoor Learning Center C5061 N613929
Heritage Middle School C6221 N282313
CPS Pecan Valley C6781 N513220
Government Canyon C16101 N503419
AreaMonitoring SitePOCApril 2020
Corpus Christi-Victoria
Corpus Christi West C42464536
Corpus Christi Tuloso C211484736
Victoria C871504836
AreaMonitoring SitePOCApril 2020
Lower Rio Grande Valley
Mission C43/AP1431563827
Harlingen Teege C10231453727
AreaMonitoring SitePOCApril 2020
Laredo Vidaurri C44/AFGP144/P2441603937
NA - Data not available.
 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 - 0.054
51 - 100 Not Defined 0.055 - 0.070
101 - 150 0.125 - 0.164 0.071 - 0.085
151 - 200 0.165 - 0.204 0.086 - 0.105
201 - 300 0.205 - 0.404 0.106 - 0.200
301 - 400 0.405 - 0.504 Not Defined
401 - 500 Not Defined Not Defined
500+ Not Defined Not Defined
  • The AQI for ozone is based on either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight.

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, 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.