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Daily Maximum Eight-Hour Ozone Averages for May 2024

The table below lists the peak daily maximum eight-hour ozone concentrations measured in May 2024 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 SitePOCMay 2024POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 245474745523557474253NANANV5361NV5258565137294638454655392Ft. Worth Northwest C13/AH302
Keller C172505350465736NV4844535130475965455666605440315044474858452Keller C17
Frisco C31/C6801566054456236NV5043515032485770475869636444355149435258491Frisco C31/C680
Denton Airport South C56/A163/X1571525552405736634941515030455570445972665943325242444961481Denton Airport South C56/A163/X157
Arlington Municipal Airport C611454645445530543837524529476058395955554837294441414649391Arlington Municipal Airport C61
Dallas North No.2 C63/C6791525252436232634339484828516156396360565337284647415153391Dallas North No.2 C63/C679
Rockwall Heath C6914342NV355329473736434127NVNV523854NANANANV273843354148NA1Rockwall Heath C69
Grapevine Fairway C70/A301/X1821464847385430574741504626455461395463565138294638404655431Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711575454445636464342505134427164446359576039334251414850NA1Kaufman C71/A304/X071
Granbury C73/C681143555050554054NV446151415063635259615657NV315141495050431Granbury C73/C681
Eagle Mountain Lake C75 1NANANANANANV574841525030475863435460585336294934444860441Eagle Mountain Lake C75
Parker County C7614447473950305045NV525434475358475252474930224530384347421Parker County C76
Cleburne Airport C77/C6821485246504935504140594641456264455456555137334838464447431Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3585554NVNVNV6343435553335465NVNVNANANANV39294648435054473Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021545352485834584443545132526865NVNANANANV41334748444750431Dallas Executive Airport C402
Greenville C1006/A1981565150395426463546NV522834NV564957474245242731412533NV421Greenville C1006/A198
Pilot Point C10321556352425639625143534934466076465669656946375547414859491Pilot Point C1032
Italy C1044/A3231524947375231444039494540296358405158545038364139414242351Italy C1044/A323
Corsicana Airport C10511615858375536464443494945297464485761575743383442434844321Corsicana Airport C1051
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644252475236403138464150542924576735NVNANANANVNV2034343848272Longview C19/A127/C644
Tyler Airport Relocated C821585259414529444348515935296567475858525842392843394655231Tyler Airport Relocated C82
Karnack C85/AFHP3031523644NVNVNV363743494832275463334754555134312129323544151Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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El Paso-Juarez
Ascarate Park SE C37/A332/A172/X159145515151474242424457555350505051515348434157605855494391Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 157646363575454545758706563626360636861555166716463565251Chamizal C41/AH126
Socorro Hueco C49/F3121536161615548495053596358605960566063565244616362565145111Socorro Hueco C49/F312
Skyline Park C721626465625751565358646362NVNANANANANANANANANANANV605355191Skyline Park C72
Ivanhoe C414/F5141485353534943434448495652525553485255494739535554484442131Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG2211525658565147484850646157NV58NV555560545046596258554849381Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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Waco
Waco Mazanec C1037151564540573347NV414747472765695262645752413837NV534952351Waco Mazanec C1037
Temple Georgia C104513548404251324649434645NV175662445159504841NVNANANANV42291Temple Georgia C1045
Killeen Skylark Field C10471394939465138515145474935245671NV5258535849443751564748341Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2362641302827252738426129375279533460604433242123283149162Beaumont-Downtown C2/A112/C2002
West Orange C9/A141229243626242423213239573132487652326158392920191923264372West Orange C9/A141
Port Arthur West C28/A128/A2281402642292625232433404732345373523354463432211824252636151Port Arthur West C28/A128/A228
Hamshire C64/C6541302547312826232431475128355672463447523729191718242738101Hamshire C64/C654
SETRPC Port Arthur C6281 N42NVNANV333229NV33NVNV38396382583862NVNANANANANANANANANA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654142355132302825272745544440626856375249433625NVNANANANANA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N272838282728272836NVNV26NV4771NV3153NVNANANANANANANANANA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431332641282423222432424827345274473352503428201822252640161SETRPC 43 Jefferson Co Airport C643
Nederland 17th Street C10351362643292827252737445431365583543561594034242127282950171Nederland 17th Street C1035
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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Austin
Austin North Hills Drive C3/A3222303832374636474950524628266063445064535142383947554953282Austin North Hills Drive C3/A322
Audubon C381233326293833404449484321235461344255495041373645524249231Audubon C38
Dripping Springs School C6141 N293128394441445160655527297276455068565746424753595355311Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N33413436NVNANANANANANANANANANANANANANANANANANANANANANANA1CAPCOG Lake Georgetown C690
Lockhart C16041 N283328343834454850564927256554345146454135333643464237191Lockhart C1604
CAPCOG Bastrop CAMS16121 N253528323925NV40464437242462624351565350464643535652NV311CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N5149484856556271705347362744464942444344514347576564NV531CAPCOG Elgin C1613
CAPCOG East Austin C16191 N253227333933434246464123NV5657375058474537343647504547251CAPCOG East Austin C1619
CAPCOG Round Rock Brushy Creek W C16201 NNANANANANANANV8762373720NV49NVNV445643NVNV3027NV454041211CAPCOG Round Rock Brushy Creek W C1620
CAPCOG Taylor Murphy Park C16291 N324239405130454540453927185559385153484639363551505046261CAPCOG Taylor Murphy Park C1629
CAPCOG Lake Kyle Park C16301 NNANV273642395058495346332755573845544546393639NVNANANANA1CAPCOG Lake Kyle Park C1630
CAPCOG San Marcos Staples Road C16751 N292623313730383643494426235858364956494634323544424037151CAPCOG San Marcos Staples Road C1675
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G3162333443352628303241375023325898NVNANANV5237312929394279172Houston East C1/G316
Houston Aldine C8/AF108/X150 23242433829NV3738494454NV395998NV3391NVNV3934343447NVNV172Houston Aldine C8/AF108/X150
Channelview C15/AH115 3293743312623273032395126376082NVNV74534331232627353764143Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542324140403131433961424327335396393061726742NV3537454458172Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391363547322627303339445028386581473259554335292727353958211Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4513432442823232627313749243165704329NANANV30222125293042191Seabrook Friendship Park C45
Houston Bayland Park C53/A146 132NVNV362831363949525024406175443256635238332830384156221Houston Bayland Park C53/A146
Conroe Relocated C78/A3211425047374141595361443931415892523578667258485353645848191Conroe Relocated C78/A321
Manvel Croix Park C8412735463326272934395650293961654430NANANV31282225323941131Manvel Croix Park C84
Clinton C403/C304/AH113 3253342332423263035445125315881NVNANANV4730242324354178193Clinton C403/C304/AH113
Houston North Wayside C405/C10331293742352627313542375226345394NVNANANANV35292828404271121Houston North Wayside C405/C1033
Houston Monroe C406126NVNV32NVNV26283639442630556840264850383034344445NVNANA1Houston Monroe C406
Lang C4082273336332325333549414926315483NVNANANANV34302831404272172Lang C408
Houston Croquet C4092283443322527323541474719345367392848584634292729364054182Houston Croquet C409
Houston Westhollow C410/C30031323844352931NV415459563047NANV41305357493530NVNANANANANA1Houston Westhollow C410/C3003
Park Place C416131NV4736272933364445482135638043286757493630272737NVNANA1Park Place C416
Houston Harvard Street C4171323343362729343748435125375785NVNANA625439333131414478251Houston Harvard Street C417
Sheldon C5511 N24333727221920273135472232557634247346392719232332345681Sheldon C551
Baytown Wetlands Center C5521 N303143262123242629384824295866412950433228221923293447151Baytown Wetlands Center C552
Crosby Library C5531 N283943NANA27303136NV52NANA5582NVNANANANV32272824363857101Crosby Library C553
West Houston C5541 N314042362730393654515528405778NVNANANANANANANV32424353191West Houston C554
La Porte Sylvan Beach C5561 NNANANV302422282832374925356374482949463733232126323446251La Porte Sylvan Beach C556
Mercer Arboretum C5571 N304242372728413949NVNANANA53954125100746440323233484556111Mercer Arboretum C557
Tom Bass C5581 N30364834262728333352502735596944274959453327NV23313546171Tom Bass C558
Katy Park C5591 N303940332727354050505227385065NVNANANANANANVNV27343645171Katy Park C559
Atascocita C5601 N324043352830383847425725375486432594535841333434464662151Atascocita C560
Meyer Park C5611 N29NVNANANANV4139584348282951103NVNANANANANV343336444362141Meyer Park C561
Bunker Hill Village C5621 N29344233NVNANV354748512331NV7539NVNANANANANV2829394255211Bunker Hill Village C562
Huffman Wolf Road C5631 N30414129272838394138422440508341287551453629333042444981Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N303746352625273135445226356391NVNANANANANANANANANANANANA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N323846322729323439405027456071453565NVNANANANANANANANANA1Wallisville Road C617
Texas City 34th St. C620 1 N453659403331323843546446517990634162NVNANANANANANANANANA1Texas City 34th St. C620
UH Moody Tower C6951 N2934433526283235434348193860774230615748353027NVNANANV201UH Moody Tower C695
Lynchburg Ferry C1015/A165 1364049332727293234375327365686NVNANANVNV34262727363667181Lynchburg Ferry C1015/A165
Lake Jackson C1016 1323045332828293639555339385564403052543733292431353842211Lake Jackson C1016
Baytown Garth C10171333847322728323340395226466071473566494034282727364067161Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831433356383130303537575847507475634563594539262236343538301Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N363252363030303638585643435864563250NVNANANANANANANANANA1Oyster Creek C1607
Liberty Sam Houston Library C16261 N31NANV2929243034383640193649704125464842302225NVNANANANA1Liberty Sam Houston Library C1626
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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San Antonio
San Antonio Northwest C232302130334041544670565140337359446760595444434850545556292San Antonio Northwest C23
Camp Bullis C58 1282025303840494769555036296962456362625947444950575656241Camp Bullis C58
Calaveras Lake C591322830353938484657585238407555455658545143404553544952271Calaveras Lake C59
Elm Creek Elementary C5011 N2921293134384542626153363873564264595650403947495012273NA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N282325333841494568555035316965465960656247434944565554261Fair Oaks Ranch C502
Bulverde Elementary C5031 N251721263236414252514631265957425359534839354042484446201Bulverde Elementary C503
New Braunfels Airport C5041 N26181727322936344048422523595736505449473735NV43433850301New Braunfels Airport C504
AACOG City of Garden Ridge C505 1 N281620303635444759584932276859405869554239354151524847151AACOG City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N292420303232394048474227196055365250484639363851524847211Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N332731343939494357615338448658465961575344424954585053281Heritage Middle School C622
CPS Pecan Valley C6781 N171419242227343239463829175637314239353426262934333329111CPS Pecan Valley C678
Government Canyon C16101 N272329313940514179625936367664476965575342344038434348151Government Canyon C1610
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C42342931343231354250534536445951383443463532333741424244422Corpus Christi West C4
Corpus Christi Tuloso C211312831343129354149484138426050393545443731333539404145381Corpus Christi Tuloso C21
Victoria C87134253633292733424555513545NV59454049484440353434394248221Victoria C87
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP1431303134303132375449413531425439NANV47494038354045NVNANANA1Mission C43/AP143
Harlingen Teege C10231353032363536404552443439405542394238383939384039434550241Harlingen Teege C1023
AreaMonitoring SitePOCMay 2024POCMonitoring Site
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Laredo
Laredo College C441 N404843374143396264504838486257535279594447535564595043271Laredo College C44
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.