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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 2024POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 24438475557435043384945545444355742422Ft. Worth Northwest C13/AH302
Keller C1724740496066465347424947585649386047452Keller C17
Frisco C31/C68014541506176505347484349585852406849471Frisco C31/C680
Denton Airport South C56/A163/X15714437485576485054464948595748395952441Denton Airport South C56/A163/X157
Dallas North No.2 C63/C67914342526968495744454449575748415846511Dallas North No.2 C63/C679
Rockwall Heath C6914040526763486041474348525342384542441Rockwall Heath C69
Grapevine Fairway C70/A301/X18214338476263455046414847555444386242441Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07114642576169526045474654595846443842391Kaufman C71/A304/X071
Granbury C73/C68114744505665465448425145676249406239431Granbury C73/C681
Eagle Mountain Lake C75 14542505862475348435250595944386248441Eagle Mountain Lake C75
Parker County C7613940485557445446455147605539336333421Parker County C76
Cleburne Airport C77/C68214439505363465343405044635748385439411Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 34643537167495946504951626051465647543Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40214540546568495945485052646150445547471Dallas Executive Airport C402
Greenville C1006/A19814145575968526737484956545753353538401Greenville C1006/A198
Pilot Point C103214744526683515355504852616053396458451Pilot Point C1032
Italy C1044/A3231423953586145NA39394551585443383740441Italy C1044/A323
Corsicana Airport C105114641586168525843474556565750453645421Corsicana Airport C1051
AreaMonitoring SitePOCApril 2024POCMonitoring Site
Longview C19/A127/C64424734515763536250495052566152394040392Longview C19/A127/C644
Tyler Airport Relocated C8215637566168586144484254567350414042401Tyler Airport Relocated C82
Karnack C85/AFHP30314442518862485041473947586247363838351Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2024POCMonitoring Site
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X15914243444453595648554950433645635457501Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 15151535166716956626163484759706770641Chamizal C41/AH126
Socorro Hueco C49/F31214646565057636251595959555044606461621Socorro Hueco C49/F312
Skyline Park C7215050565560676556595665575359716472691Skyline Park C72
Ivanhoe C414/F51413940474150525644494849454047545660531Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG22114043444051565544474558503947625962571Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCApril 2024POCMonitoring Site
Waco Mazanec C103714440556366465743465052595847393637481Waco Mazanec C1037
Temple Georgia C104514339506461455438394645615449363633471Temple Georgia C1045
Killeen Skylark Field C104714943536464465842384946695954434437571Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2024POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 23647567763514447465050675548423836322Beaumont-Downtown C2/A112/C2002
West Orange C9/A14123644506363524548465246635647443832292West Orange C9/A141
Port Arthur West C28/A128/A22813442516556484245444948565447413633311Port Arthur West C28/A128/A228
Hamshire C64/C65413750568060534349485452655850453737321Hamshire C64/C654
SETRPC Port Arthur C6281 N4253617266615154576158566055NANANANA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C165413949577058565253514554596357474236341SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N3952586582564847475853616050NANANANA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C64313346537158474045434348635446393431301SETRPC 43 Jefferson Co Airport C643
Nederland 17th Street C103513648557262504247455051665853443835351Nederland 17th Street C1035
AreaMonitoring SitePOCApril 2024POCMonitoring Site
Austin North Hills Drive C3/A32224442527358456237424751675749403634492Austin North Hills Drive C3/A322
Audubon C3814237496355425436284446625248393635491Audubon C38
Dripping Springs School C6141 N4445627365436337485160706152434036521Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N4139456354435435344440625247373332491CAPCOG Lake Georgetown C690
Lockhart C16041 N3849557056406033385063665446383434411Lockhart C1604
CAPCOG Bastrop CAMS16121 N3743506852425133374047674743343229391CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N4941456254535046474440615145444443491CAPCOG Elgin C1613
CAPCOG East Austin C16191 N3938476753395332394448625245373331441CAPCOG East Austin C1619
CAPCOG Round Rock Brushy Creek W C16201 N3233NA7053NANA5528404056NANA47NA65NA1CAPCOG Round Rock Brushy Creek W C1620
CAPCOG Taylor Murphy Park C16291 N4140487255435434424745645246383632441CAPCOG Taylor Murphy Park C1629
CAPCOG Lake Kyle Park C16301 N4642496770415635454648575144413631351CAPCOG Lake Kyle Park C1630
CAPCOG San Marcos Staples Road C16751 N3941456551415635394451585246393431461CAPCOG San Marcos Staples Road C1675
AreaMonitoring SitePOCApril 2024POCMonitoring Site
Houston East C1/G31624353556963525141484551695652413941392Houston East C1/G316
Houston Aldine C8/AF108/X150 243555667675053404448551005853393843402Houston Aldine C8/AF108/X150
Channelview C15/AH115 34052546863504437464655675751393536343Channelview C15/AH115
Northwest Harris Co. C26/A110/X15424147505959454337404349825450403740422Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23913857546859514339464558635948403839341Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4513563586656483838454658635544393435321Seabrook Friendship Park C45
Houston Bayland Park C53/A146 14454566561504941474656695849424038371Houston Bayland Park C53/A146
Conroe Relocated C78/A32115354627285695941515072847967535248651Conroe Relocated C78/A321
Manvel Croix Park C8413556576656504035434757595348403633321Manvel Croix Park C84
Clinton C403/C304/AH113 33650476148454835374350615249363132293Clinton C403/C304/AH113
Houston North Wayside C405/C103313948486258495537404149805250373539381Houston North Wayside C405/C1033
Houston Monroe C4061375349605245373640425154484536NA28281Houston Monroe C406
Lang C40823949536159464835414752675848393836412Lang C408
Houston Croquet C40923947506054474338434249615446393634322Houston Croquet C409
Houston Westhollow C410/C300314049546357474540434551625748403736361Houston Westhollow C410/C3003
Park Place C41614255556558504840454555635551413836361Park Place C416
Houston Harvard Street C41714149526359484839454150635449403835361Houston Harvard Street C417
Sheldon C5511 N3753556863474429404554715547353234301Sheldon C551
Baytown Wetlands Center C5521 N3354536558503838403652595445393432321Baytown Wetlands Center C552
Crosby Library C5531 N4053557270525338454854676052433737391Crosby Library C553
West Houston C5541 N4252566661494739434654786052413838381West Houston C554
La Porte Sylvan Beach C5561 N3153536354503637424253605543393137321La Porte Sylvan Beach C556
Mercer Arboretum C5571 N44485365705050384345511026053404048471Mercer Arboretum C557
Tom Bass C5581 N4056566656494037444656635649403532361Tom Bass C558
Katy Park C5591 N3949536457454235414650765546403835411Katy Park C559
Atascocita C5601 N394853656752503641NANA696455434246451Atascocita C560
Meyer Park C5611 N4349546466495037414550826150414140451Meyer Park C561
Bunker Hill Village C5621 N3747516058464633404049635444373531361Bunker Hill Village C562
Huffman Wolf Road C5631 N4150556975515338464752666053413735401Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N4058587266525039454858786653NANANANA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N4460607771585447525261686453NANANANA1Wallisville Road C617
Texas City 34th St. C620 1 N4273627863614751565370726657NANANANA1Texas City 34th St. C620
UH Moody Tower C6951 N4254556558494840454655635650403735361UH Moody Tower C695
UH WG Jones Forest C6981 N5049576672554934454753946354464551571UH WG Jones Forest C698
Lynchburg Ferry C1015/A165 14451546266534041474452786153443940371Lynchburg Ferry C1015/A165
Lake Jackson C1016 141535571545141NA304756605550413736331Lake Jackson C1016
Baytown Garth C101714153536965535042484755625749423735381Baytown Garth C1017
Galveston 99th St. C1034/A320/X18314573607654594850545169706356474438371Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N4260566955554344484859655653NANANANA1Oyster Creek C1607
Liberty Sam Houston Library C16261 N3947537683484938454549625551403333321Liberty Sam Houston Library C1626
AreaMonitoring SitePOCApril 2024POCMonitoring Site
San Antonio
San Antonio Northwest C2324547485956455535544952635950444039592San Antonio Northwest C23
Camp Bullis C58 14743496058465434575050656153454038621Camp Bullis C58
Calaveras Lake C5914354576154445737505256635849413335501Calaveras Lake C59
Elm Creek Elementary C5011 N4250516151455835515157625748393837441Elm Creek Elementary C501
Fair Oaks Ranch C5021 N4542475654455035564846625851444241621Fair Oaks Ranch C502
Bulverde Elementary C5031 N3738425149394529424341555146373331501Bulverde Elementary C503
New Braunfels Airport C5041 N4349537057465836465053645851393432461New Braunfels Airport C504
AACOG City of Garden Ridge C505 1 N4149526656445639484551625850423232541AACOG City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N3639435547374629373045504539343331421Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N445761NANANANANA505559686150443638511Heritage Middle School C622
CPS Pecan Valley C6781 N3036404641334326343941484435292426401CPS Pecan Valley C678
Government Canyon C16101 N3948515952415830465052605544373435491Government Canyon C1610
AreaMonitoring SitePOCApril 2024POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C424257565753524136355765605850423835372Corpus Christi West C4
Corpus Christi Tuloso C2114059565550504236345753595747413634341Corpus Christi Tuloso C21
Victoria C8714256626658474538365457665648413731321Victoria C87
AreaMonitoring SitePOCApril 2024POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP14313846494745383729324953504739373232311Mission C43/AP143
Harlingen Teege C102314655535556503932355853585747413838361Harlingen Teege C1023
AreaMonitoring SitePOCApril 2024POCMonitoring Site
Laredo College C441 N4355595560555241445570605948424239581Laredo College C44
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.