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Peak Daily One-Hour Ozone Averages for September 2020

The table below lists the peak daily one-hour ozone concentrations measured in September 2020 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 SitePOCSeptember 2020POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2344547545649443621214235394648496055592Ft. Worth Northwest C13/AH302
Keller C172344246535250433127223534383942405447502Keller C17
Frisco C31/C6801364355573856514139223329443840485048451Frisco C31/C680
Midlothian OFW C52/A1371343844333438452934184848404656545851511Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571334357684456483819243330374039414748471Denton Airport South C56/A163/X157
Arlington Municipal Airport C611364344434739433233204545375055525857571Arlington Municipal Airport C61
Dallas North No.2 C63/C6791334041584552483934213837423841495645451Dallas North No.2 C63/C679
Rockwall Heath C691353645484043463735183140363637403749461Rockwall Heath C69
Grapevine Fairway C70/A301/X1821355153675154493929203533384241384947471Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711353444353140473328153435293536393243431Kaufman C71/A304/X071
Granbury C73/C6811344045404036403120192932394742455557661Granbury C73/C681
Eagle Mountain Lake C75 1354452625450433615203533344242475351531Eagle Mountain Lake C75
Parker County C761313946544638402920182423364341435250541Parker County C76
Cleburne Airport C77/C6821354046313934422827183738425555546763611Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3353542524644453530204347434252535951523Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021373948484842493835205449414761567356551Dallas Executive Airport C402
Greenville C1006/A1981323645453341433334152729373536383548421Greenville C1006/A198
Pilot Point C10321364756513765554223253332444245424947261Pilot Point C1032
Italy C1044/A3231383642323139473234164953474857645551481Italy C1044/A323
Corsicana Airport C10511353341363040453733174339293939403649NA1Corsicana Airport C1051
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
Longview C19/A127/C6442343439672860404335324245363146424447412Longview C19/A127/C644
Tyler Airport Relocated C821343137263637493631222631393137383450431Tyler Airport Relocated C82
Karnack C85/AFHP3031302841332151545239282430272933313043391Karnack C85/AFHP303
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G1252556475615155464726304350584764705767642El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591486572554738434224283941564556595357571Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1506065504543434622284043543757585254571Chamizal C41/AH126
Socorro Hueco C49/F3121527277555040485026294144574653645860591Socorro Hueco C49/F312
Skyline Park C721546168555248474827294048544756605559601Skyline Park C72
Ivanhoe C414/F5141536472585541534825294145564659635356561Ivanhoe C414/F514
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
Waco Mazanec C10371403745303542493438154353484553574747471Waco Mazanec C1037
Temple Georgia C10451433339344042463033153144454546444452531Temple Georgia C1045
Killeen Skylark Field C10471413841353838483127132437434837414849491Killeen Skylark Field C1047
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2201822264053594334624438252832432951422Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412NANANA224050534329574029222726292751412West Orange C9/A141
Port Arthur West C28/A128/A2281191919235163474436465342293030353352421Port Arthur West C28/A128/A228
Hamshire C64/C6541181718275357423430474844313133353854441Hamshire C64/C654
SETRPC Port Arthur C6281 N201819244665494130454650343332363757451SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541NANANANANANANANANANANANANA1936463253361SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N252327363439664935664333263232363154441SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431201820274760513930484642303131373251421SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1191819234654603830514038262829342950401Nederland High School C1035
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
Audubon C38132372423314846271693242394538474053471Audubon C38
Dripping Springs School C6141 N373831283747483122123546394541483958571Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N404132323745503325132844424539464256551CAPCOG Lake Georgetown C690
Lockhart C16041 N333935253241372923134444383839493958541Lockhart C1604
St. Edwards University C16051 N303029232739352316113946353942503848481St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N323535253242382727163544383738394253561CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N333735293145422926153745384141434160541CAPCOG Elgin C1613
CAPCOG East Austin C16191 N323431263046372821104348383942523850491CAPCOG East Austin C1619
CAPCOG San Marcos Staples Road C16751 N353928273242433221135060444552634257571CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N474138354644463632143349454542494253531CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
Houston East C1/G3162232035245160513535424838262428402544402Houston East C1/G316
Houston Aldine C8/AF108/X150 2241829182431352122302826151629311436252Houston Aldine C8/AF108/X150
Channelview C15/AH115 3221935194345574233394136252431362845423Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542262341293845433840403939263036383653492Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391231928214882504338425644373040463854461Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451191719194144444233334937282941593046391Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1222237338069423327516753333645484161531Houston Bayland Park C53/A146
Conroe Relocated C78/A3211373540242944585748363442262733383553491Conroe Relocated C78/A321
Manvel Croix Park C841211825264853383427647252444151584363491Manvel Croix Park C84
Clinton C403/C304/AH113 3211630266060443631485341293035453251443Clinton C403/C304/AH113
Houston North Wayside C4051191830274041493634454540222735362747411Houston North Wayside C405
Houston Monroe C4061201621234382373225415138322638423424NA1Houston Monroe C406
Lang C4082242440364760463832465843323141433556492Lang C408
Houston Croquet C4092221825327573423429556550363646513656502Houston Croquet C409
Houston Westhollow C4101201436376353413128425246323244433556501Houston Westhollow C410
Park Place C4161211827398087483932556045343341483450451Park Place C416
Sheldon C5511 NNANANANANANANANANANANANANA2232352648411Sheldon C551
Baytown Wetlands Center C5521 N161623183945473933344036242730403050431Baytown Wetlands Center C552
Crosby Library C5531 NNANANANA2034664270715931202328322748401Crosby Library C553
West Houston C5541 N211841375546423331384743323240423455501West Houston C554
La Porte Sylvan Beach C5561 N131216133539414031283837212230532644371La Porte Sylvan Beach C556
Mercer Arboretum C5571 N232435253036514540403133222428332945411Mercer Arboretum C557
Tom Bass C5581 N201622224583393327526145343342493454451Tom Bass C558
Katy Park C5591 N221743375444363230313641283040393555511Katy Park C559
Atascocita C5601 N202131152334514632283131212127322443371Atascocita C560
Meyer Park C5611 N272139353242453836324436252732363049451Meyer Park C561
Bunker Hill Village C5621 N191637245053352522414840283140433454461Bunker Hill Village C562
Huffman Wolf Road C5631 N323137292733684536354238242737363253441Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N201631275358483932424134242228362644381HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N222238214150564034464437272833383154471Wallisville Road C617
Texas City 34th St. C620 1 N221923255052525339376945383242724760511Texas City 34th St. C620
UH Moody Tower C6951 N232131387378463932586048333543473354401UH Moody Tower C695
UH WG Jones Forest C6981 N34294229334453555339404025283640NANANA1UH WG Jones Forest C698
UH West Liberty C6991 N252633252529613929353834222531322847311UH West Liberty C699
Lynchburg Ferry C1015/A165 1201826174244493634362928241923302946411Lynchburg Ferry C1015/A165
Lake Jackson C1016 1181417213341333224316458364854504765551Lake Jackson C1016
Baytown Garth C10171252541254356594136504640293135403454471Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831191819224257535039386956362934544659471Galveston 99th St. C1034/A320/X183
UH Smith Point C16061 NNA1522204054544538394937312934423654391UH Smith Point C1606
Oyster Creek C1607 1 N191925284351474837428153474861575564521Oyster Creek C1607
UH Launch Trailer C16111 N232028346673433731565746293140442950361UH Launch Trailer C1611
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
San Antonio
San Antonio Northwest C232414639364153373323164355364242484152562San Antonio Northwest C23
Camp Bullis C58 1485743404163453922184344384647444757621Camp Bullis C58
Calaveras Lake C591373432293847333322174748435050524862651Calaveras Lake C59
Elm Creek Elementary C5011 N344141263946252826215860444139584247561Elm Creek Elementary C501
Fair Oaks Ranch C5021 N394135282750363117112734303838343845481Fair Oaks Ranch C502
Bulverde Elementary C5031 N434436252942403318122635303738353849501Bulverde Elementary C503
New Braunfels Airport C5041 N323726242838372716124050384445554054551New Braunfels Airport C504
City of Garden Ridge C5051 N324228233242383017112646374336404150531City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N323932222837352719114340333643493552491Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N323728253442333020154247414843504456621Heritage Middle School C622
CPS Pecan Valley C6781 N324225263140342619114150443937473946531CPS Pecan Valley C678
Government Canyon C16101 N323934223346302722113041283840363642481Government Canyon C1610
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C42282920202832312519244755443436524449482Corpus Christi West C4
Corpus Christi Tuloso C211292821232938332619194747413738494050581Corpus Christi Tuloso C21
Victoria C871282735333543243024294247313335353354611Victoria C87
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP1431282512233128272221202845443434404338521Mission C43/AP143
Harlingen Teege C1023129NANA202931292724223656433634444241571Harlingen Teege C1023
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P24415063282639262715NA182160464041495140581Laredo Vidaurri C44/AFGP144/P244
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.