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Peak Daily One-Hour Ozone Averages for May 2022

The table below lists the peak daily one-hour ozone concentrations measured in May 2022 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 SitePOCMay 2022
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2604636394071455149565358626453
Keller C172574341373770434744545958606049
Frisco C31/C6801605241403588454645495061646958
Denton Airport South C56/A163/X1571674839393890575249485261677857
Arlington Municipal Airport C611584342354260434745506260615353
Dallas North No.2 C63/C6791584341373772444443484660586552
Rockwall Heath C691544344333365373847373645495345
Grapevine Fairway C70/A301/X1821644541363974474947464853636853
Kaufman C71/A304/X0711603342403862424154414352585557
Granbury C73/C6811603434404462495251454557645553
Eagle Mountain Lake C75 1634737403777475049575160627052
Parker County C761623841394568485050474656625852
Cleburne Airport C77/C6821613827404261525149565055686054
Dallas Hinton St. C401/C60/AH161 3504038313458363937403846545450
Dallas Executive Airport C4021574144364163474645554863635556
Greenville C1006/A1981584541303858404049343744526248
Pilot Point C10321645043413571525353485565717561
Italy C1044/A3231543225374256444242525655545455
Corsicana Airport C10511563526443867464454615464566159
AreaMonitoring SitePOCMay 2022
Longview C19/A127/C6442623747283754474234384452474044
Tyler Airport Relocated C821645348425058425048414549576154
Karnack C85/AFHP3031563748323246503839385357564853
AreaMonitoring SitePOCMay 2022
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X1591534843525349525351484648545867
Chamizal C41/AH126 1595448535755585750454659576072
Socorro Hueco C49/F3121595652516059605952514653627974
Skyline Park C721636255616165675855465255556277
Ivanhoe C414/F5141534946505350505047504245556065
Ojo De Agua C1021/FG121/FG221161545153585459584847555248NANA
AreaMonitoring SitePOCMay 2022
Waco Mazanec C103714831283637NA474141555050535146
Temple Georgia C10451413342373952534341404650585249
Killeen Skylark Field C10471453343394259574649414356685556
AreaMonitoring SitePOCMay 2022
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2233224243776202628394571454045
West Orange C9/A1412313127244279332826475070564953
Port Arthur West C28/A128/A2281273627254246253127455061444343
Hamshire C64/C6541263427253949252226334855474548
SETRPC Port Arthur C6281 N3240322850502530NANANANANANANA
SETRPC 40 Sabine Pass C640/C16541334232284942273127465362474546
SETRPC Mauriceville 42 C642/C311/C6651 N3741312748743135NANANANANANANA
SETRPC 43 Jefferson Co Airport C6431273627244360222727454864454344
Nederland 17th Street C10351NANANANANANANANANANANA58474647
AreaMonitoring SitePOCMay 2022
Austin North Hills Drive C3/A3222523438363066574543404448566452
Audubon C381512937353161544138354148565752
Dripping Springs School C6141 N423440373775634848374455606357
CAPCOG Lake Georgetown C6901 N573448414067655149415160706961
Lockhart C16041 N353438333060544543384454525856
CAPCOG Bastrop CAMS16121 N363540333657594745404558546157
CAPCOG Elgin C16131 N363039343454544744414458515855
CAPCOG East Austin C16191 N493741393368604745404757526355
CAPCOG Round Rock Brushy Creek W C16201 N393242353557554344364251586053
CAPCOG San Marcos Staples Road C16751 N393841373979644946364451525757
AreaMonitoring SitePOCMay 2022
Houston East C1/G3162363828263280403232365470554951
Houston Aldine C8/AF108/X150 2NA3427273775433237465580595453
Channelview C15/AH115 3283629253486393226294355514952
Northwest Harris Co. C26/A110/X15424142383138116483944628377535852
Hou.DeerPrk2 C35/235/1001/AFH139FP2391283527253552343130335060464445
Seabrook Friendship Park C451233025202636232524294148373841
Houston Bayland Park C53/A146 1313929263661403131355155454953
Conroe Relocated C78/A3211454951434693635062546288747057
Manvel Croix Park C841253425253240322827294450434243
Clinton C403/C304/AH113 3333527243862383628384260444546
Houston North Wayside C405/C10331353426233495372829365068524846
Houston Monroe C4061263324223643332925314755433739
Lang C40823337292530110413031385962485154
Houston Croquet C4092283826263449383130324549424548
Houston Westhollow C410/C30031283427233570382728364249464441
Park Place C4161303627243649363229335462494243
Houston Harvard Street C4171353929263478403432416173485053
Baytown Wetlands Center C5521 N253229213749242624303750423942
Crosby Library C5531 N273728263671372829294155595057
West Houston C5541 N3640322635121403533455664555250
La Porte Sylvan Beach C5561 N243229223042232423313750373742
Mercer Arboretum C5571 N474138323577523747526394656162
Tom Bass C5581 N243326233343322925284348424141
Katy Park C5591 N3135262840102362937384550414243
Atascocita C5601 N343531283171443334374360585247
Meyer Park C5611 N423529253088473135556889555545
Bunker Hill Village C5621 N263525222880392527324748424545
Huffman Wolf Road C5631 N314133293957493233324359685760
HRM-3 Haden Road C603/A114 1 N3235272534593827NANANANANANANA
Wallisville Road C617 1 N3039322644613232NANANANANANANA
Texas City 34th St. C620 1 N3441322844433237NANANANANANANA
UH Moody Tower C6951 N293326233351333127355263464244
UH WG Jones Forest C6981 N484848424197624762626298736955
Lynchburg Ferry C1015/A165 1243731273862323229324657514849
Lake Jackson C1016 1323526263134323427374748394246
Baytown Garth C10171354435304869383834384961585362
Galveston 99th St. C1034/A320/X1831344032253540313327444854454546
UH Smith Point C16061 N313931254850283127394657464453
Oyster Creek C1607 1 N3540312832383636NANANANANANANA
UH Launch Trailer C16111 N323728243456373430365665514649
Liberty Sam Houston Library C16261 N334230223931NA2224284552514867
AreaMonitoring SitePOCMay 2022
San Antonio
San Antonio Northwest C232373543393956564647384549506153
Camp Bullis C58 1373143403964604853394957576859
Calaveras Lake C591312733303552493941293745414844
Fair Oaks Ranch C5021 N333037363555554346364451535853
Bulverde Elementary C5031 N292634313054534143303648556154
New Braunfels Airport C5041 N282631292956504139283440414442
City of Garden Ridge C5051 N302732303257484138283643485345
Seguin Outdoor Learning Center C5061 N252227252445443534263337384040
Heritage Middle School C6221 N323035333653494142303947434645
CPS Pecan Valley C6781 N221724232435322628212632303730
Government Canyon C16101 N302335302845453434293540404744
AreaMonitoring SitePOCMay 2022
Corpus Christi-Victoria
Corpus Christi West C42292724252533312430223739384240
Corpus Christi Tuloso C211NANA22242433322531233839384139
Victoria C871262724241935382731273742404542
AreaMonitoring SitePOCMay 2022
Lower Rio Grande Valley
Mission C43/AP1431322831304039443538303738434541
Harlingen Teege C10231272528292935353434263238414540
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.