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Daily Maximum Eight-Hour Ozone Averages for September 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in September 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 SitePOCSeptember 2019POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 26763656466615536384022324450554533NA2Ft. Worth Northwest C13/AH302
Keller C1726465696475695838424437NV6468686648NA2Keller C17
Frisco C31/C68015249564985887142474639466958575044NA1Frisco C31/C680
Midlothian OFW C52/A13715047484655545536424336394953534537NA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X15715152695165705938414235425662595245NA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C6115752475262595435414233395153574736NA1Arlington Municipal Airport C61
Dallas North No.2 C63/C67915655565379836539454635446562605146NA1Dallas North No.2 C63/C679
Rockwall Heath C6914750454772715936434533396253524541NA1Rockwall Heath C69
Grapevine Fairway C70/A301/X18215553665375755936424335406665635647NA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07114950445058585836454734385358545038NA1Kaufman C71/A304/X071
Granbury C73/C68115656524854535137403535444857615443NA1Granbury C73/C681
Eagle Mountain Lake C75 16569757064655839414436465672737150NA1Eagle Mountain Lake C75
Parker County C76160666270585454384138344448626865NVNA1Parker County C76
Cleburne Airport C77/C68215552525156565838434438505760625143NA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 35752494769655533404031375458595039NA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40216256535667676140474940435762635442NA1Dallas Executive Airport C402
Greenville C1006/A1981484341426062613540452938NV54524442NA1Greenville C1006/A198
Pilot Point C103215149734866767245474541475157565143NA1Pilot Point C1032
Italy C1044/A32315250444953575837464437435557574538NA1Italy C1044/A323
Corsicana Airport C105115250415053565940455133435956564135NA1Corsicana Airport C1051
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Longview C19/A127/C64425447515663686047445132416159584339NA2Longview C19/A127/C644
Tyler Airport Relocated C821544853575459584441503539576160NVNANA1Tyler Airport Relocated C82
Karnack C85/AFHP30315143505254646653485338454948484538NA1Karnack C85/AFHP303
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G12525057545352595353494233474139405446NA2El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591NANANV5245494449NV3927443636324743NA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1485249504952515452453448353537NV48NA1Chamizal C41/AH126
Socorro Hueco C49/F31214649505248454158524736483938354551NA1Socorro Hueco C49/F312
Skyline Park C72147495352545055555847354542403957NVNA1Skyline Park C72
Ivanhoe C414/F51414548505348474456574837454040364851NA1Ivanhoe C414/F514
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Waco Mazanec C103715550454856645937454139466257604638NA1Waco Mazanec C1037
Temple Georgia C104515249464552595437403737455458614837NA1Temple Georgia C1045
Killeen Skylark Field C104715250474550595541413729435358604834NA1Killeen Skylark Field C1047
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 24026365660645442533829365159403726NA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A14123625475749556451443727375158473729NA2West Orange C9/A141
Port Arthur West C28/A128/A2281422836NV61615240473826335550513529NA1Port Arthur West C28/A128/A228
Hamshire C64/C65414130NV50NVNANANANV33NV2349NANANV34NA1Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C165415036323964595342474028315046423332NA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N3727334744526455473732414659413730NA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C64314832515466735946544332386058574133NA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 13926504754615140483724335254463626NA1Nederland High School C1035
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Austin Northwest C3/A32225551454956695436363833365553514836NA2Austin Northwest C3/A322
Audubon C3814650444559745438373733405355524537NA1Audubon C38
Dripping Springs School C6141 N5352495146625238363634395558545139NA1Dripping Springs School C614
CAPCOG Lake Georgetown C6901 NNANANANANV322820212119235760585139NA1CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N5346454645604737343732365353505036NA1Gorzycki Middle School C1603
Lockhart C16041 N4647424432464035353832324853474833NA1Lockhart C1604
St. Edwards University C16051 N4843424244554333313229314948464532NA1St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N4843404450533933363830295351464430NA1CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N5043424751574534373628345052494633NA1CAPCOG Elgin C1613
CAPCOG San Marcos Staples Road C16751 N5249464832534638354035355156505240NA1CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 NNVNANANANV605035373531375053514736NA1CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Houston East C1/G31624232334666705136474427364949412628NA2Houston East C1/G316
Houston Aldine C8/AF108/X150 24536295193856349584936495357443835NA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 34331304865626245484327344749422930NA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X15424435304586734440534546584853383830NA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23915038464961624433484227355154423131NA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45145323943517443354742NANANV51433635NA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 15743506873724737535038496965573930NA1Houston Bayland Park C53/A146
Conroe Relocated C78/A32114336274163676158634738394349383730NA1Conroe Relocated C78/A321
Manvel Croix Park C8415944444858543631474128365761463533NA1Manvel Croix Park C84
Clinton C403/C304/AH113 3433337495963433340382736515143NV30NA3Clinton C403/C304/AH113
Houston North Wayside C40513931264674735139474429374448392927NA1Houston North Wayside C405
Houston Monroe C40615440454758614133444030385559453435NA1Houston Monroe C406
Lang C40824937315079754837474335425055413228NA2Lang C408
Houston Croquet C40925238505160573932464130396058483528NA2Houston Croquet C409
Houston Westhollow C41015342NV6270653935464536436361503929NA1Houston Westhollow C410
Park Place C4161513947NV64684636474432406058513535NA1Park Place C416
Baytown Wetlands Center C5521 N4332444752645340504223305051423234NA1Baytown Wetlands Center C552
Crosby Library C5531 N393127506264745351452737NVNANANANANA1Crosby Library C553
West Houston C5541 N4939375376694036474239465557433828NA1West Houston C554
La Porte Sylvan Beach C5561 N3627333846634133443823284343353032NA1La Porte Sylvan Beach C556
Mercer Arboretum C5571 N3629223672675244503928363842312822NA1Mercer Arboretum C557
Tom Bass C5581 N5742485060594034474232416061473431NA1Tom Bass C558
Katy Park C5591 N5142445774653834484639395958444232NA1Katy Park C559
Atascocita C5601 N36NVNANANANANANANANANV283132262624NA1Atascocita C560
Meyer Park C5611 N4436284590805142514338524752393727NA1Meyer Park C561
Bunker Hill Village C5621 N4636375368653932423730355353423120NA1Bunker Hill Village C562
Huffman Wolf Road C5631 N4334304564647756544832404750403634NA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N4634375163695539494630395254453230NA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N4132335257596847514428354951433639NA1Wallisville Road C617
Danciger C618 1 N6148384554513029474330425361494235NA1Danciger C618
Texas City 34th St. C620 1 N6041404860724341524631415959534340NA1Texas City 34th St. C620
UH Moody Tower C6951 NNVNV456071744939474734426159523734NA1UH Moody Tower C695
UH WG Jones Forest C6981 N4637294378725756625441NV4751413932NA1UH WG Jones Forest C698
UH West Liberty C6991 N3829274056567249484128344445363127NA1UH West Liberty C699
Lynchburg Ferry C1015/A165 14032364859605741504225344849413132NA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 15540294048452328423925315257413634NA1Lake Jackson C1016
Baytown Garth C101714334355460627048524629375253443640NA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X18316445355158654246524833406158534240NA1Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N6245324847462940474229335663513836NA1Oyster Creek C1607
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
San Antonio
San Antonio Northwest C2325252535140625136344027425460545644NA2San Antonio Northwest C23
Camp Bullis C58 15452495040615838384526465359535243NA1Camp Bullis C58
Calaveras Lake C5914750NV5039484033333931385058494948NA1Calaveras Lake C59
Elm Creek Elementary C5011 N4852484438394130293524354655474951NA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N4747454334565334354026424653484638NA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N4747454230515433343825384752484738NA1Bulverde Elementary C503
New Braunfels Airport C5041 N4443404226454031333630314551464536NA1New Braunfels Airport C504
City of Garden Ridge C5051 N4748454528484230313428354854484940NA1City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N4244405129463932343529314652444532NA1Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N4347424635473528303527344552444646NA1Heritage Middle School C622
CPS Pecan Valley C6781 N4247414533474028283320324349434644NA1CPS Pecan Valley C678
Government Canyon C16101 N4948474538594832313626425459545642NA1Government Canyon C1610
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C425339322432282427263126234157394443NA2Corpus Christi West C4
Corpus Christi Tuloso C2115541342531302728273025NV4055404544NA1Corpus Christi Tuloso C21
Victoria C8715347444131403128NV392826456248NV35NA1Victoria C87
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP14313831252128313227232230232736393546NA1Mission C43/AP143
Harlingen Teege C102314429252629273134272534233036413338NA1Harlingen Teege C1023
AreaMonitoring SitePOCSeptember 2019POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P24413340392325313434332934323243444056NA1Laredo 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.