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Daily Maximum Eight-Hour Ozone Averages for December 2023

The table below lists the peak daily maximum eight-hour ozone concentrations measured in December 2023 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 SitePOCDecember 2023
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 22524
Keller C1722322
Frisco C31/C68012319
Denton Airport South C56/A163/X15712519
Arlington Municipal Airport C6112223
Dallas North No.2 C63/C67912215
Rockwall Heath C6912217
Grapevine Fairway C70/A301/X18212315
Kaufman C71/A304/X07112525
Granbury C73/C68113038
Eagle Mountain Lake C75 12626
Parker County C7612935
Cleburne Airport C77/C68212834
Dallas Hinton St. C401/C60/AH161 32013
Dallas Executive Airport C40212323
Greenville C1006/A19812626
Pilot Point C103212318
Italy C1044/A32312529
Corsicana Airport C105112525
AreaMonitoring SitePOCDecember 2023
Longview C19/A127/C64422926
Tyler Airport Relocated C8212822
Karnack C85/AFHP30312823
AreaMonitoring SitePOCDecember 2023
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X15913236
Chamizal C41/AH126 13839
Socorro Hueco C49/F31213840
Skyline Park C7214444
Ivanhoe C414/F51413840
AreaMonitoring SitePOCDecember 2023
Waco Mazanec C103712626
Temple Georgia C104512929
Killeen Skylark Field C10471NV31
AreaMonitoring SitePOCDecember 2023
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 22319
West Orange C9/A14122016
Port Arthur West C28/A128/A22812318
Hamshire C64/C65412216
SETRPC 40 Sabine Pass C640/C165412517
SETRPC 43 Jefferson Co Airport C64312018
Nederland 17th Street C103512418
AreaMonitoring SitePOCDecember 2023
Austin North Hills Drive C3/A32223031
Audubon C3813130
AreaMonitoring SitePOCDecember 2023
Houston East C1/G31621312
Houston Aldine C8/AF108/X150 21411
Channelview C15/AH115 31716
Northwest Harris Co. C26/A110/X15421716
Hou.DeerPrk2 C35/235/1001/AFH139FP23911312
Seabrook Friendship Park C4511011
Houston Bayland Park C53/A146 11814
Conroe Relocated C78/A32112319
Manvel Croix Park C8411513
Clinton C403/C304/AH113 31513
Houston North Wayside C405/C103311311
Houston Monroe C4061139
Lang C40821613
Houston Croquet C40921712
Houston Westhollow C410/C300311814
Park Place C41611310
Houston Harvard Street C41711611
Sheldon C5511 N1714
Baytown Wetlands Center C5521 N1214
Crosby Library C5531 N18NA
West Houston C5541 NNV15
La Porte Sylvan Beach C5561 N119
Mercer Arboretum C5571 N1614
Tom Bass C5581 N1712
Katy Park C5591 N1716
Atascocita C5601 N1615
Meyer Park C5611 N1413
Bunker Hill Village C5621 N1210
Huffman Wolf Road C5631 N1914
UH Moody Tower C6951 N2012
UH WG Jones Forest C6981 NNA18
Lynchburg Ferry C1015/A165 1713
Lake Jackson C1016 12115
Baytown Garth C101712117
Galveston 99th St. C1034/A320/X18312210
Liberty Sam Houston Library C16261 N1916
AreaMonitoring SitePOCDecember 2023
San Antonio
San Antonio Northwest C2323331
Camp Bullis C58 13431
Calaveras Lake C5912525
Heritage Middle School C6221 NNVNA
AreaMonitoring SitePOCDecember 2023
Corpus Christi-Victoria
Corpus Christi West C422031
Corpus Christi Tuloso C2111934
Victoria C8711819
AreaMonitoring SitePOCDecember 2023
Lower Rio Grande Valley
Mission C43/AP14311229
Harlingen Teege C102311830
AreaMonitoring SitePOCDecember 2023
Laredo College C441 N2237
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.