Skip to main content

Daily Maximum Eight-Hour Ozone Averages for May 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in May 2019 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 2019POCMonitoring Site
123456789101112131415161718192021
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 24344404450443540252630405360555737355630NA2Ft. Worth Northwest C13/AH302
Keller C1724542434149473844282829435762606039405130NA2Keller C17
Frisco C31/C68014852484458574247352927466975717045465640NA1Frisco C31/C680
Midlothian OFW C52/A13714346405144423641312731505559585238346130NA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X15714546463955504243282929466169646341435132NA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C611NVNV394445413640272630475158575236336028NA1Arlington Municipal Airport C61
Dallas North No.2 C63/C679144484446535240433027295163NV676243405739NA1Dallas North No.2 C63/C679
Rockwall Heath C6914542384145473041282822435257575232334825NA1Rockwall Heath C69
Grapevine Fairway C70/A301/X18214443424251463843303028425866516038385229NA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07114745294446513646392622515357615543445033NA1Kaufman C71/A304/X071
Granbury C73/C6811NANANV4845433943283131385452535338336733NA1Granbury C73/C681
Eagle Mountain Lake C75 148484744565141NANANV32455862596041445733NA1Eagle Mountain Lake C75
Parker County C7615048474449474148283231375557545439435834NA1Parker County C76
Cleburne Airport C77/C6821NV51455247464247312831435658605842397334NA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 347454048NVNANANANVNV28505662595537325832NA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402147464151484739NV342828566065635241346332NA1Dallas Executive Airport C402
Greenville C1006/A19814445334246523644342619405354635437455023NA1Greenville C1006/A198
Pilot Point C10321454851435958444731322844698072734723039NA1Pilot Point C1032
Italy C1044/A32314246354839392740312727505455544832305223NA1Italy C1044/A323
Corsicana Airport C105114647304350523644372621485160615945384543NA1Corsicana Airport C1051
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
Tyler-Longview-Marshall
Longview C19/A127/C644240412236474837NV441621386952575741323825NA2Longview C19/A127/C644
Tyler Airport Relocated C8214943284149503643362223405858626143NV3722NA1Tyler Airport Relocated C82
Karnack C85/AFHP303137392729444846NV34NVNANANANV675749363727NA1Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
El Paso-Juarez
El Paso UTEP C12/A125/X151/G12525050535555514346603645465465645348605853NA2El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591464650525244414357NVNANANV64614945585952NA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1NANANANANANANANANANANANANANANANANV646256NA1Chamizal C41/AH126
Socorro Hueco C49/F31215155565858524748573750466366605550606157NA1Socorro Hueco C49/F312
Skyline Park C7215456565958544850613749495864665657656262NA1Skyline Park C72
Ivanhoe C414/F51415355576058544749573650475964615755646359NA1Ivanhoe C414/F514
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
Waco
Waco Mazanec C103713846374739383741382625415553544636304127NA1Waco Mazanec C1037
Temple Georgia C104513746434444353743363224405352524835274427NA1Temple Georgia C1045
Killeen Skylark Field C104714050484648NANANANV32NVNANV52565238304430NA1Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 23736304457513132294520304755575239312822NA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A14123641294261473335464830294454535538323123NA2West Orange C9/A141
Port Arthur West C28/A128/A2281343629434447323356NANV304653505642322920NA1Port Arthur West C28/A128/A228
Hamshire C64/C6541NV36294147493129305224305558565536302820NA1Hamshire C64/C654
SETRPC Port Arthur C6281 N3537304645473436465128335053525747322921NA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541343831494347333532NANV344752505545293019NA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N374330NV48513335484825314863595538332923NA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431374031495350343534NV27344957555846NANANVNA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1333528414845303230NANANV4552505036282819NA1Nederland High School C1035
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
Austin
Austin Northwest C3/A32222740394453314238333320384953554535244628NA2Austin Northwest C3/A322
Audubon C3812435304049313533273118365153554735224727NA1Audubon C38
Dripping Springs School C6141 N2837454556374441293122385357494533274528NA1Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N3442394152364141313321385251595238264631NA1CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N2537434351314139303119364853454332244126NA1Gorzycki Middle School C1603
Lockhart C16041 N2941464954314636353122404850444334264227NA1Lockhart C1604
St. Edwards University C16051 N2232354046273630302816344346403628213623NA1St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N2638413949324136292415345248494029213823NA1CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N3039424147323934312919374846503930234026NA1CAPCOG Elgin C1613
CAPCOG San Marcos Staples Road C16751 N3141434758354638383424424951454332274328NA1CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N3242394345324041333221374645494131244124NA1CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
Houston-Galveston-Brazoria
Houston East C1/G3162313122505355NVNANV3815305858515136253021NA2Houston East C1/G316
Houston Aldine C8/AF108/X150 2333822NV66623831474621365164645941253825NA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 32832224845463829484820305057494935252818NA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X15423135284360584435423617364560766135253625NA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23913233275449534635505321315855505138272620NA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4513132274743494334494822305152484839272019NA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 13438NVNANANANV41514922458069605837293422NA1Houston Bayland Park C53/A146
Conroe Relocated C78/A321142412645556243NV404025374757576148294338NA1Conroe Relocated C78/A321
Manvel Croix Park C841313326594747NV31NANANANANANV565031273021NA1Manvel Croix Park C84
Clinton C403/C304/AH113 32330205148473727404416305654454729212616NA3Clinton C403/C304/AH113
Houston North Wayside C40512932204855533528NV39183146545350352330NVNA1Houston North Wayside C405
Houston Monroe C4061252821484344NVNANV4313295149485132272719NA1Houston Monroe C406
Lang C40823133224955534430443319375165595534253622NA2Lang C408
Houston Croquet C40923133265349494733464517416657535133262819NA2Houston Croquet C409
Houston Westhollow C41013335295153515034564617407769595433253422NA1Houston Westhollow C410
Park Place C41613133245652534732475014356657495233262919NA1Park Place C416
Baytown Wetlands Center C5521 N2426183632392419303911244143404029201311NA1Baytown Wetlands Center C552
Crosby Library C5531 N2525193138382725353512243849454329222515NA1Crosby Library C553
La Porte Sylvan Beach C5561 NNA18203430352924292912183435363831191312NA1La Porte Sylvan Beach C556
Tom Bass C5581 N3234285950524736485320406356525434282921NA1Tom Bass C558
Katy Park C5591 NNV34304652514834493713396774625233243323NA1Katy Park C559
Atascocita C5601 N2526173243422922363513223745414132192817NA1Atascocita C560
Meyer Park C5611 N3234214063593830443818344458665736243524NA1Meyer Park C561
Huffman Wolf Road C5631 N2120142229292118NVNV11182535292922182315NA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N29332351524537NV475017316058535237242920NA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N3334274345484034515322335159495137292520NA1Wallisville Road C617
Danciger C618 1 NNANANV524842453551511541NVNV544329242519NA1Danciger C618
Texas City 34th St. C620 1 N3635336550NV4939595836355461575748342521NA1Texas City 34th St. C620
UH Moody Tower C6951 N3436276056574934NVNVNVNA7266535536283222NA1UH Moody Tower C695
UH WG Jones Forest C6981 N3839244561674233414223384860626549294336NA1UH WG Jones Forest C698
UH West Liberty C6991 NNANANVNANANA3430444417304259494833273219NA1UH West Liberty C699
Lynchburg Ferry C1015/A165 12933253641474133485118265254484836272418NA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 13230255246475037535423455455564835302019NA1Lake Jackson C1016
Baytown Garth C10171NV44365457645345NVNANANANANANV4937302721NA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X18313332397046NV4739565946324858565547342620NA1Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N33292954455149NV283014253353NV4737291816NA1Oyster Creek C1607
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
San Antonio
San Antonio Northwest C2322434344654343638352225364854504429254628NA2San Antonio Northwest C23
Camp Bullis C58 12438374859364038382425375153544935284834NA1Camp Bullis C58
Calaveras Lake C59129374053553336353630294144464445323044NVNA1Calaveras Lake C59
Elm Creek Elementary C5011 N2530365353353240302328414152413828223929NA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N2236374456363935322123334951524934254833NA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N2335324252323333302120314547464430254329NA1Bulverde Elementary C503
New Braunfels Airport C5041 N2434374652273730312721343742403928243825NA1New Braunfels Airport C504
City of Garden Ridge C5051 N2334364553283032352723354451434229254026NA1City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N2736394654273930292619364245424230254027NA1Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N2434344952293232302525363843394128234127NA1Heritage Middle School C622
CPS Pecan Valley C6781 NNV2927444722273027212234NVNANANANANANANANA1CPS Pecan Valley C678
Government Canyon C16101 N2436364455373534392325365155564532214631NA1Government Canyon C1610
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
Corpus Christi-Victoria
Corpus Christi West C423031455755524528485026464649433632323229NA2Corpus Christi West C4
Corpus Christi Tuloso C21128294148504740263732253940NVNANANANANANANA1Corpus Christi Tuloso C21
Victoria C8713132445753444032362619395046464228233123NA1Victoria C87
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
Lower Rio Grande Valley
Mission C43/AP14313029234237353634354027343633353722353232NA1Mission C43/AP143
Harlingen Teege C102313736295342383834335828414340403528393434NA1Harlingen Teege C1023
AreaMonitoring SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021
Laredo
Laredo Vidaurri C44/AFGP144/P24413022183137383230301624342725262418323026NA1Laredo Vidaurri C44/AFGP144/P244
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.