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Daily Maximum Eight-Hour Ozone Averages for October 2020

The table below lists the peak daily maximum eight-hour ozone concentrations measured in October 2020 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 SitePOCOctober 2020POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2423860404359636046475237515141393738102Ft. Worth Northwest C13/AH302
Keller C17240376037466262613852534255514039353682Keller C17
Frisco C31/C680141406139457162582553604355584139374091Frisco C31/C680
Midlothian OFW C52/A137141385741405449442935494547513637343771Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571404064384967677134465842505742413841101Denton Airport South C56/A163/X157
Arlington Municipal Airport C61143405841435856523538534551553339363971Arlington Municipal Airport C61
Dallas North No.2 C63/C679138385838426458542744574252563838363881Dallas North No.2 C63/C679
Rockwall Heath C69138374734365249422144444045473435323471Rockwall Heath C69
Grapevine Fairway C70/A301/X182139375937NV6259573349514250534038353781Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071136324333324644362026413942493335343581Kaufman C71/A304/X071
Granbury C73/C6811464058424351565239364746494343413533131Granbury C73/C681
Eagle Mountain Lake C75 1423963404959676640515346565145433937111Eagle Mountain Lake C75
Parker County C761424057394652585738414746544645433635121Parker County C76
Cleburne Airport C77/C682146405744415454483433474548473737333681Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 340365339375751462942514244513739333753Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402145426043416154503346554853564042383971Dallas Executive Airport C402
Greenville C1006/A198138344436355253411931464244563535313781Greenville C1006/A198
Pilot Point C10321403865374471635725386144586243393941111Pilot Point C1032
Italy C1044/A323143385942395652422835505149513638NVNANA1Italy C1044/A323
Corsicana Airport C10511NV395442395850NV27324643495235384140111Corsicana Airport C1051
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Longview C19/A127/C6442383738383754522721313840555132363236222Longview C19/A127/C644
Tyler Airport Relocated C821403939384354573120293843545234373540201Tyler Airport Relocated C82
Karnack C85/AFHP3031333237253236442221303933385131352836231Karnack C85/AFHP303
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G1252505047574552575445413944454042494339232El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X15914843424840484749353635414334NVNANV37141Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1404041474144454342403732413735374038161Chamizal C41/AH126
Socorro Hueco C49/F3121494347504949535846424043484143NV5141211Socorro Hueco C49/F312
Skyline Park C721495145524955595249443843524441494940191Skyline Park C72
Ivanhoe C414/F514148464548515653574743394251NV43464841161Ivanhoe C414/F514
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Waco Mazanec C10371484262494461543829375354525341413940131Waco Mazanec C1037
Temple Georgia C10451574355514860574231465352536144413742151Temple Georgia C1045
Killeen Skylark Field C10471574457504560594728475048544846393341151Killeen Skylark Field C1047
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2544050525241NV172127343647NV38313938352Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412493846494742341524253037416339313735302West Orange C9/A141
Port Arthur West C28/A128/A22815541475256444019NVNANANANV5037313937361Port Arthur West C28/A128/A228
Hamshire C64/C6541504048555445431827303044525137303535341Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C16541NANANANANV462815NVNANANANANANANANANANA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N5440575446423319NVNV4237437245354239361SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C64315844475460404018NVNV3242525239323937361SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1533846485139351625273037445137293736351Nederland High School C1035
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Audubon C381614954465661594425434849604843393140211Audubon C38
Dripping Springs School C6141 N6156NV475661644722535048634844473142191Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N6447NV505868574328515150555346413744141CAPCOG Lake Georgetown C690
Lockhart C16041 N6447NV535358583230444252554041403740181Lockhart C1604
St. Edwards University C16051 N544546435553523227434046533938363135171St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N6348NV525559583229454649554838414142211CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N5948NV495359563228444750524239NV3939171CAPCOG Elgin C1613
CAPCOG East Austin C16191 N5949NV486260573529494549584342393640191CAPCOG East Austin C1619
CAPCOG San Marcos Staples Road C16751 N5847NV495959623625524448563940393440191CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N5742NV454657523427484648494440NV3738181CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Houston East C1/G3162543554617243401421433339546031203837302Houston East C1/G316
Houston Aldine C8/AF108/X150 2574562605653401724403838516137273741302Houston Aldine C8/AF108/X150
Channelview C15/AH115 3583646575644391822423342515330243535283Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542524276485356502225313435505331283738232Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391604452736253522124473241575933274139361Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451573547524842482118422633394926223431301Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1664755668164512127383337695130273837301Houston Bayland Park C53/A146
Conroe Relocated C78/A3211594155564652462226344140447340333946291Conroe Relocated C78/A321
Manvel Croix Park C841684853805964602425372934645127243836271Manvel Croix Park C84
Clinton C403/C304/AH113 3584150647151NANV23402932674827263535253Clinton C403/C304/AH113
Houston North Wayside C4051503655545646361520333132455031233434251Houston North Wayside C405
Houston Monroe C4061543647685949NV18NV392735624726213533271Houston Monroe C406
Lang C4082614562676957481824393636585838233738282Lang C408
Houston Croquet C4092614152626658542123353135825030243736282Houston Croquet C409
Houston Westhollow C4101554251607058531921342733634625223332251Houston Westhollow C410
Park Place C4161614251707253512122NANANV775532223937291Park Place C416
Sheldon C5511 N523745535144381522393137435232243233221Sheldon C551
Baytown Wetlands Center C5521 N51374257444438NVNANANV36414823233031281Baytown Wetlands Center C552
Crosby Library C5531 N513447534339351320373336396233233133291Crosby Library C553
West Houston C5541 N584660616458511923333035584727253334211West Houston C554
La Porte Sylvan Beach C5561 N593848524943452121482435395028223331251La Porte Sylvan Beach C556
Mercer Arboretum C5571 N493956494347381620293530415735223236261Mercer Arboretum C557
Tom Bass C5581 N614253776056571921352733624928233836301Tom Bass C558
Katy Park C5591 N524553556262582624333034554627283534201Katy Park C559
Atascocita C5601 N4836454941433114183032NVNANANANANA35241Atascocita C560
Meyer Park C5611 N524277575454462124333434505635253637231Meyer Park C561
Bunker Hill Village C5621 N564352606856471622342833574627213030211Bunker Hill Village C562
Huffman Wolf Road C5631 N543948564244371826344136397040303540341Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N533849616242391822422838NV5435283226201HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N5941486160474221264933465462NV303738351Wallisville Road C617
Texas City 34th St. C620 1 N744455605457602729443030455638374640431Texas City 34th St. C620
UH Moody Tower C6951 N6444526579574821244533NANV5532243938301UH Moody Tower C695
UH WG Jones Forest C6981 N584257575058482326403940NV6839313943261UH WG Jones Forest C698
UH West Liberty C6991 N5035445339403415223538NV366537263136311UH West Liberty C699
Lynchburg Ferry C1015/A165 1483545544940361720393137444926253232281Lynchburg Ferry C1015/A165
Lake Jackson C1016 1594750565064542626322422454525274035261Lake Jackson C1016
Baytown Garth C10171564049606047422328503749566635303941391Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831NV50525650633822NV392419415238324643411Galveston 99th St. C1034/A320/X183
UH Smith Point C16061 N6442505449585224275926NANA5736314137371UH Smith Point C1606
Oyster Creek C1607 1 N705658705871543332453228515940385044401Oyster Creek C1607
UH Launch Trailer C16111 N6041496278514418NVNANANANANV31213837271UH Launch Trailer C1611
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
San Antonio
San Antonio Northwest C232666151575964715525554742703642442942212San Antonio Northwest C23
Camp Bullis C58 1727060557077746229665748754448503147211Camp Bullis C58
Calaveras Lake C591595149525758664429524153543443403238171Calaveras Lake C59
Elm Creek Elementary C5011 N525244514850695026463942523038382435171Elm Creek Elementary C501
Fair Oaks Ranch C5021 N535750405661544922554738533639402738201Fair Oaks Ranch C502
Bulverde Elementary C5031 N555450406062564822584939583939402640191Bulverde Elementary C503
New Braunfels Airport C5041 N534543454451533222453842463336342835131New Braunfels Airport C504
City of Garden Ridge C5051 N615447496259624623574447573840392639181City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N595045485653562824454044493636353337161Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N554743485248614124483746483239362534141Heritage Middle School C622
CPS Pecan Valley C6781 N534541475251603921433539503034351931121CPS Pecan Valley C678
Government Canyon C16101 N595947475357635722514340633339412636181Government Canyon C1610
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C42605244536264533833342623314021283934232Corpus Christi West C4
Corpus Christi Tuloso C211605344556262523833372829353821294234231Corpus Christi Tuloso C21
Victoria C871575550505357533931433234474327283735201Victoria C87
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP14314956424655535134284330NV2430NV233930161Mission C43/AP143
Harlingen Teege C10231505644535457473229413128182523253834221Harlingen Teege C1023
AreaMonitoring SitePOCOctober 2020POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P2441476247424749584942544237323044343437201Laredo 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.