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Peak Daily One-Hour Ozone Averages for April 2024

The table below lists the peak daily one-hour ozone concentrations measured in April 2024 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 2024
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 24438475557435043384945545444
Keller C1724740496066465347424947585649
Frisco C31/C68014541506176505347484349585852
Denton Airport South C56/A163/X15714437485576485054464948595748
Dallas North No.2 C63/C67914342526968495744454449575748
Rockwall Heath C6914040526763486041474348525342
Grapevine Fairway C70/A301/X18214338476263455046414847555444
Kaufman C71/A304/X07114642576169526045474654595846
Granbury C73/C68114744505665465448425145676249
Eagle Mountain Lake C75 14542505862475348435250595944
Parker County C7613940485557445446455147605539
Cleburne Airport C77/C68214439505363465343405044635748
Dallas Hinton St. C401/C60/AH161 34643537167495946504951626051
Dallas Executive Airport C40214540546568495945485052646150
Greenville C1006/A19814145575968526737484956545753
Pilot Point C103214744526683515355504852616053
Italy C1044/A3231423953586145NA39394551585443
Corsicana Airport C105114641586168525843474556565750
AreaMonitoring SitePOCApril 2024
Longview C19/A127/C64424734515763536250495052566152
Tyler Airport Relocated C8215637566168586144484254567350
Karnack C85/AFHP30314442518862485041473947586247
AreaMonitoring SitePOCApril 2024
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X15914243444453595648554950433645
Chamizal C41/AH126 15151535166716956626163484759
Socorro Hueco C49/F31214646565057636251595959555044
Skyline Park C7215050565560676556595665575359
Ivanhoe C414/F51413940474150525644494849454047
Ojo De Agua C1021/FG121/FG22114043444051565544474558503947
AreaMonitoring SitePOCApril 2024
Waco Mazanec C103714440556366465743465052595847
Temple Georgia C104514339506461455438394645615449
Killeen Skylark Field C104714943536464465842384946695954
AreaMonitoring SitePOCApril 2024
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 23647567763514447465050675548
West Orange C9/A14123644506363524548465246635647
Port Arthur West C28/A128/A22813442516556484245444948565447
Hamshire C64/C65413750568060534349485452655850
SETRPC Port Arthur C6281 N42536172666151NANANANANANANA
SETRPC 40 Sabine Pass C640/C165413949577058565253514554596357
SETRPC Mauriceville 42 C642/C311/C6651 N39525865825648NANANANANANANA
SETRPC 43 Jefferson Co Airport C64313346537158474045434348635446
Nederland 17th Street C103513648557262504247455051665853
AreaMonitoring SitePOCApril 2024
Austin North Hills Drive C3/A32224442527358456237424751675749
Audubon C3814237496355425436284446625248
Dripping Springs School C6141 N4445627365436337485160706152
CAPCOG Lake Georgetown C6901 N4139456354435435344440625247
Lockhart C16041 N3849557056406033385063665446
CAPCOG Bastrop CAMS16121 N3743506852425133374047674743
CAPCOG Elgin C16131 N4941456254535046474440615145
CAPCOG East Austin C16191 N3938476753395332394448625245
CAPCOG Round Rock Brushy Creek W C16201 N3233NA7053NANA5528404056NANA
CAPCOG Taylor Murphy Park C16291 N4140487255435434424745645246
CAPCOG Lake Kyle Park C16301 N4642496770415635454648575144
CAPCOG San Marcos Staples Road C16751 N3941456551415635394451585246
AreaMonitoring SitePOCApril 2024
Houston East C1/G31624353556963525141484551695652
Houston Aldine C8/AF108/X150 243555667675053404448551005853
Channelview C15/AH115 34052546863504437464655675751
Northwest Harris Co. C26/A110/X15424147505959454337404349825450
Hou.DeerPrk2 C35/235/1001/AFH139FP23913857546859514339464558635948
Seabrook Friendship Park C4513563586656483838454658635544
Houston Bayland Park C53/A146 14454566561504941474656695849
Conroe Relocated C78/A32115354627285695941515072847967
Manvel Croix Park C8413556576656504035434757595348
Houston North Wayside C405/C103313948486258495537404149805250
Houston Monroe C40613753496052453736404251544845
Lang C40823949536159464835414752675848
Houston Croquet C40923947506054474338434249615446
Houston Westhollow C410/C300314049546357474540434551625748
Park Place C41614255556558504840454555635551
Houston Harvard Street C41714149526359484839454150635449
Sheldon C5511 N3753556863474429404554715547
Baytown Wetlands Center C5521 N3354536558503838403652595445
Crosby Library C5531 N4053557270525338454854676052
West Houston C5541 N4252566661494739434654786052
La Porte Sylvan Beach C5561 N3153536354503637424253605543
Mercer Arboretum C5571 N44485365705050384345511026053
Tom Bass C5581 N4056566656494037444656635649
Katy Park C5591 N3949536457454235414650765546
Atascocita C5601 N394853656752503641NANA696455
Meyer Park C5611 N4349546466495037414550826150
Bunker Hill Village C5621 N3747516058464633404049635444
Huffman Wolf Road C5631 N4150556975515338464752666053
HRM-3 Haden Road C603/A114 1 N40585872665250NANANANANANANA
Wallisville Road C617 1 N44606077715854NANANANANANANA
Texas City 34th St. C620 1 N42736278636147NANANANANANANA
UH Moody Tower C6951 N4254556558494840454655635650
UH WG Jones Forest C6981 N5049576672554934454753946354
Lynchburg Ferry C1015/A165 14451546266534041474452786153
Lake Jackson C1016 141535571545141NA304756605550
Baytown Garth C101714153536965535042484755625749
Galveston 99th St. C1034/A320/X18314573607654594850545169706356
Oyster Creek C1607 1 N42605669555543NANANANANANANA
Liberty Sam Houston Library C16261 N3947537683484938454549625551
AreaMonitoring SitePOCApril 2024
San Antonio
San Antonio Northwest C2324547485956455535544952635950
Camp Bullis C58 14743496058465434575050656153
Calaveras Lake C5914354576154445737505256635849
Elm Creek Elementary C5011 N4250516151455835515157625748
Fair Oaks Ranch C5021 N4542475654455035564846625851
Bulverde Elementary C5031 N3738425149394529424341555146
New Braunfels Airport C5041 N4349537057465836465053645851
AACOG City of Garden Ridge C505 1 N4149526656445639484551625850
Seguin Outdoor Learning Center C5061 N3639435547374629373045504539
Heritage Middle School C6221 N445761NANANANANA505559686150
CPS Pecan Valley C6781 N3036404641334326343941484435
Government Canyon C16101 N3948515952415830465052605544
AreaMonitoring SitePOCApril 2024
Corpus Christi-Victoria
Corpus Christi West C424257565753524136355765605850
Corpus Christi Tuloso C2114059565550504236345753595747
Victoria C8714256626658474538365457665648
AreaMonitoring SitePOCApril 2024
Lower Rio Grande Valley
Mission C43/AP14313846494745383729324953504739
Harlingen Teege C102314655535556503932355853585747
AreaMonitoring SitePOCApril 2024
Laredo College C441 N4355595560555241445570605948
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.