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Peak Daily One-Hour Ozone Averages for September 2023

The table below lists the peak daily one-hour ozone concentrations measured in September 2023 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 2023POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 28793655450786461767165516638496462717466544239475182832Ft. Worth Northwest C13/AH302
Keller C1729186635049786760777567506437535961757563534438464965912Keller C17
Frisco C31/C68017568675456898678666169485141516363898469615944614858801Frisco C31/C680
Arlington Municipal Airport C6117678664446NANANANANANA5665354468707147NANANANANANANANA1Arlington Municipal Airport C61
Dallas North No.2 C63/C67918173714750948678696164505138566965828467515239545554771Dallas North No.2 C63/C679
Rockwall Heath C691535859433872767764575543443342NANANA7460494940424458661Rockwall Heath C69
Grapevine Fairway C70/A301/X18218882635250877166726871482540525961777560514738524867891Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07117074785651496485766260665844546966718566515046455858681Kaufman C71/A304/X071
Granbury C73/C68118382716754666464936771626138536367717268494340495582701Granbury C73/C681
Eagle Mountain Lake C75 19385675650736355NA4474516644586061737771584540625569921Eagle Mountain Lake C75
Parker County C7618587656247656259827768455535555358676460484035625267761Parker County C76
Cleburne Airport C77/C68218080686052555556826766676340526875688075494941416881731Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 37979654543817368736759545634556665748065464538475659803Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40218185724644676769786762686733557772778468464638507269841Dallas Executive Airport C402
Greenville C1006/A19816062644840668384666161514942516259727856464741374055641Greenville C1006/A198
Pilot Point C103217159726160677471636075494542565961887769666449655055791Pilot Point C1032
Italy C1044/A32317374714442475558736363835234447275667766514138447554631Italy C1044/A323
Corsicana Airport C10511677271494641535868655870473518NANANANANA355143456057611Corsicana Airport C1051
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C644266101794344476469596160783128547362697059606145379153702Longview C19/A127/C644
Tyler Airport Relocated C8216474674444455976676177753733546262657065555645415357771Tyler Airport Relocated C82
Karnack C85/AFHP30315169594246486062534851533130475558667264723752374350531Karnack C85/AFHP303
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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El Paso-Juarez
Ascarate Park SE C37/A332/A172/X15915373684451586646685463504241596463744142723436385948631Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 15376664947555746675256464041576665764455813740426653701Chamizal C41/AH126
Socorro Hueco C49/F31215463745060576255594662494946646361734454524148455845521Socorro Hueco C49/F312
Skyline Park C7216168745251677648595976523841576569614652754040396057791Skyline Park C72
Ivanhoe C414/F51414956624450536642554661433941545657684052643536375241541Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG22116078715248676853645869543942656971624347503738406155NA1Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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Waco
Waco Mazanec C103718082704039475963787073835139435572718067524040434852581Waco Mazanec C1037
Temple Georgia C104518181674842485362676669724448445064749171544237504961691Temple Georgia C1045
Killeen Skylark Field C104718279715453535772646673714249444558718577525244484761641Killeen Skylark Field C1047
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 26887513825416170575962785436564957735854405144464664702Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412NANANANANANANA17545971725439446056NANANA334253505155682West Orange C9/A141
Port Arthur West C28/A128/A22816869472624354355696568694737404856685453394442423965681Port Arthur West C28/A128/A228
Hamshire C64/C65417582462921395489595968697739384358766254324038464752681Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C165416853402826303645776267674842405368615653394346434454731SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C64316880533124354662626372734437445157715449354442434267661SETRPC 43 Jefferson Co Airport C643
Nederland 17th Street C1035172865640254854686864717250414856587627474251474955NANA1Nederland 17th Street C1035
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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Austin
Austin North Hills Drive C3/A32228385634541486061536383616660474661808068493833415560752Austin North Hills Drive C3/A322
Audubon C3818382623937425660465779545453383048767761473430263346621Audubon C38
Dripping Springs School C6141 N9087674741455972607175556051494156837666493934445263761Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N8180654846536068596382695863464155828978564742495065691CAPCOG Lake Georgetown C690
Lockhart C16041 N7265613935385155526262706446515163767561453032325158481Lockhart C1604
St. Edwards University C16051 N7270584239415557586573666551494865847665463633376063701St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N7569603936405154516067756256464366747363453333364462601CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N7369624039435353546264635352464262697061443432334358581CAPCOG Elgin C1613
CAPCOG East Austin C16191 N7777624038415357546275605853434459777363433330325356651CAPCOG East Austin C1619
CAPCOG Round Rock Brushy Creek W C16201 N8178604440465661516172635765424557778343483935435057691CAPCOG Round Rock Brushy Creek W C1620
CAPCOG Taylor Murphy Park C16291 N7272614138415255566264645862394062677264453632334655601CAPCOG Taylor Murphy Park C1629
CAPCOG Lake Kyle Park C16301 N7570614341425356646766627750534765787465473534355964671CAPCOG Lake Kyle Park C1630
CAPCOG San Marcos Staples Road C16751 N7369624540405258656568597648575268767566503434356164681CAPCOG San Marcos Staples Road C1675
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G316281907535NANANANANANA1021128348495459808068533841415476702Houston East C1/G316
Houston Aldine C8/AF108/X150 27280613837698272685784897146585055648271604446465457672Houston Aldine C8/AF108/X150
Channelview C15/AH115 371818433267585846254861057951515058646661393838425570653Channelview C15/AH115
Northwest Harris Co. C26/A110/X154276805944446870617860867468NA3539617311276774744455157582Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391968264312953586891631128974434593648166624332314048107811Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4517169532321424548705876715637385960666554312929354367731Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1979059362861697094741159088525873731088963444338395282901Houston Bayland Park C53/A146
Conroe Relocated C78/A32116776755155716862636175766537374662647683577267575946571Conroe Relocated C78/A321
Manvel Croix Park C841105855028233745598983108726537386272917249323129314575921Manvel Croix Park C84
Clinton C403/C304/AH113 3808561324958687770561101118738516262837257423035374382733Clinton C403/C304/AH113
Houston North Wayside C405/C10331697559302660737135NA78936932534855618261493239394657621Houston North Wayside C405/C1033
Houston Monroe C406183774624193844537861100696632368060826455352929304484811Houston Monroe C406
Lang C408283856134347372668665959677505654618010561534140445166752Lang C408
Houston Croquet C4092868549322346566088631097770414063631047454353631324476852Houston Croquet C409
Houston Westhollow C410/C3003185835535276062598964102737141465158948251384133364267801Houston Westhollow C410/C3003
Park Place C416189905633265264718361111888445458065967861453636365094851Park Place C416
Houston Harvard Street C417183845934276675697463981028145576365799361513839365277781Houston Harvard Street C417
Sheldon C5511 N6973803124758279585378947543463652636761413737425654571Sheldon C551
Baytown Wetlands Center C5521 N8071682320495574755580988738376057655652322832374565671Baytown Wetlands Center C552
Crosby Library C5531 N69707628298575665551761097436383652626261353945487561601Crosby Library C553
West Houston C5541 N879257393263675992631029072465246649511062484840404869741West Houston C554
La Porte Sylvan Beach C5561 N7668562325394048695978816636416653646255322830334469761La Porte Sylvan Beach C556
Mercer Arboretum C5571 N7585684042838272645887987234614658658080655553505653621Mercer Arboretum C557
Tom Bass C5581 N948749272040526290711127276383770681047156302933314688931Tom Bass C558
Katy Park C5591 N8084533528555152916286666753394159958654403935324462631Katy Park C559
Atascocita C5601 N698476433683787461557582684252NANA587070464947516351561Atascocita C560
Meyer Park C5611 N7781623842757364755987896937504659729980755046465357641Meyer Park C561
Bunker Hill Village C5621 N8481553228NANANANANANANANANANANANANANANANANANANANANANA1Bunker Hill Village C562
Huffman Wolf Road C5631 N7072703232856771575468776737443957566560405049508245541Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N83888032227385876860103118864747516277776447353543NANANA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N7780852828908792645888120904546446170646136393949NANANA1Wallisville Road C617
Texas City 34th St. C620 1 N87905832273945558277957561504360NANANANANANANANANANANA1Texas City 34th St. C620
UH Moody Tower C6951 N86865733275466687460101928245527064878059473438355384791UH Moody Tower C695
UH WG Jones Forest C6981 N7884714555737562696383777242525364698284686565575853611UH WG Jones Forest C698
Lynchburg Ferry C1015/A165 17582NANA246189927354911128147396052766460353537395191731Lynchburg Ferry C1015/A165
Lake Jackson C1016 17169442924343540707464545134353583726853393227384754501Lake Jackson C1016
Baytown Garth C101717576812828888490655633NA83NA314358676259353939476671711Baytown Garth C1017
Galveston 99th St. C1034/A320/X18318681603534374756798178726351446394737764403344475490871Galveston 99th St. C1034/A320/X183
UH Smith Point C16061 N8174582826424750726775825943405665756155344039415077781UH Smith Point C1606
Oyster Creek C1607 1 N766852353037404577766767504341438472665640343747NANANA1Oyster Creek C1607
UH Launch Trailer C16111 N89905935285769727662104957146547267443560493639375682811UH Launch Trailer C1611
Liberty Sam Houston Library C16261 N6967542725618272525363737610444155566952383739515645521Liberty Sam Houston Library C1626
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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San Antonio
San Antonio Northwest C2328779694638476459517779557747624959806761583834355256712San Antonio Northwest C23
Camp Bullis C58 18881724843556969576881578146595060847369634438405160711Camp Bullis C58
Calaveras Lake C5917873604634395254506972707152505972707063443529356161671Calaveras Lake C59
Elm Creek Elementary C5011 N8279574431364853497470647044575271686459473333335962691Elm Creek Elementary C501
Fair Oaks Ranch C5021 N7161603936546468515877525743504656806966624437384556601Fair Oaks Ranch C502
Bulverde Elementary C5031 N8676675345556373606176566452545059877775575145495167661Bulverde Elementary C503
New Braunfels Airport C5041 N6359543733344449525444445231413749545848372432345862641New Braunfels Airport C504
AACOG City of Garden Ridge C505 1 N8077645131395462606674567750525262777370473836536377861AACOG City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N67615542363445514860585967404915NA687462483234345559661Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N8379634937425657557476706951526176787466463831346766731Heritage Middle School C622
CPS Pecan Valley C6781 N6965564128344953456965596544474762716255423228305956601CPS Pecan Valley C678
Government Canyon C16101 N716552332531454037535941583541384558514644269NA5161701Government Canyon C1610
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C426556392317273427325465563624384262655747372018234056472Corpus Christi West C4
Corpus Christi Tuloso C2116667442316325137365671623922333762676249382119214159641Corpus Christi Tuloso C21
Victoria C8716746472918324547386059575029303356635948332222284054521Victoria C87
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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Lower Rio Grande Valley
Harlingen Teege C102316258513125332647354762433924253234565559372428254448461Harlingen Teege C1023
AreaMonitoring SitePOCSeptember 2023POCMonitoring Site
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Laredo
Laredo College C441 N7259554934323843485058544844386252655854383733403747591Laredo College C44
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.