Skip to main content

Peak Daily One-Hour Ozone Averages for January 2023

The table below lists the peak daily one-hour ozone concentrations measured in January 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 SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2393241363947344246474642394345414047383533403127344047352120252Ft. Worth Northwest C13/AH302
Keller C172383138333944324243434239344043373243363432393729323744341619232Keller C17
Frisco C31/C6801422833353138NANANANA4242394344393346374232404231344149372222261Frisco C31/C680
Denton Airport South C56/A163/X1571402637353837303846504739404345403446373734404129354148391923271Denton Airport South C56/A163/X157
Arlington Municipal Airport C611372838303641323845464140364142393944363530383228303745341619231Arlington Municipal Airport C61
Dallas North No.2 C63/C6791402838313937293941444037343737353539313624363628273443332119221Dallas North No.2 C63/C679
Rockwall Heath C691332634303739313740403837363837343540323927373726293440292020221Rockwall Heath C69
Grapevine Fairway C70/A301/X1821372736323740314043464336323738332841333425373729313643331722241Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711371842354353414547484241404646413946363928413930343544292320231Kaufman C71/A304/X071
Granbury C73/C6811373342364144354644444640394345404045373645393929333846372320261Granbury C73/C681
Eagle Mountain Lake C75 1393340354048334547494641394345413446383541413830354047391922271Eagle Mountain Lake C75
Parker County C761383541374442374548464138384444423846363646393430343945382423281Parker County C76
Cleburne Airport C77/C6821403242383946354447454441404245404146383734403931334045342321261Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3332031233333273739403837213838353439313224363531283441311919233Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021403341343944364048454443374444404247393931434132323947362623271Dallas Executive Airport C402
Greenville C1006/A1981391839394450394243494640394342384045353931393925384248342120241Greenville C1006/A198
Pilot Point C10321472736414242394245514740394044403044364031394130353946382024281Pilot Point C1032
Italy C1044/A3231362839343643334546473639354341374144343628414027324043291518211Italy C1044/A323
Corsicana Airport C105114123413542523942454833393843NANA3644373224394230343943282319221Corsicana Airport C1051
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
Tyler-Longview-Marshall
Longview C19/A127/C6442302140384452394238383439413943384438383328373825354143363213172Longview C19/A127/C644
Tyler Airport Relocated C821352941404654434444443941444449474448423833414227404147403518221Tyler Airport Relocated C82
Karnack C85/AFHP3031332538394553344643433739413843424835363931353826354145343212211Karnack C85/AFHP303
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X15912638353630383831302737373937332827NA13938373733363932343534291Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1284240403444403637354343453941363644304445424642444444454338291Chamizal C41/AH126
Socorro Hueco C49/F3121324240423447414140354043464738343241374140424439414540414242311Socorro Hueco C49/F312
Skyline Park C721344644454350434140374544454342384344394846424441424343454443431Skyline Park C72
Ivanhoe C414/F5141274239393644383534323938413935333539303940393836383736373736271Ivanhoe C414/F514
Ojo De Agua C1021/FG121/FG22113643394234423539333037393037373734403641414044384141404237NANA1Ojo De Agua C1021/FG121/FG221
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
Waco
Waco Mazanec C103714029434442473445475038423947444344463935344041303539NANA1518211Waco Mazanec C1037
Temple Georgia C10451433243444452334654493642424747424946383336434232394142292319221Temple Georgia C1045
Killeen Skylark Field C10471493445464555354751464544614850435348593440434332404247392419221Killeen Skylark Field C1047
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2312328424953413440402738383840403334382924363532334028NANANA82Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412322425455054413341372737393841403536382830373835343843423422102West Orange C9/A141
Port Arthur West C28/A128/A2281NA2127475051NANANANANANANANANANA2722NA2336NANANANA384137362091Port Arthur West C28/A128/A228
Hamshire C64/C654135243348555542394044284040434542343640314039393737414543392391Hamshire C64/C654
SETRPC Port Arthur C6281 N3229305045554737444131404341444432394331444139373744454439NANA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654133252545515142383836283841424341323641303738373736414543372381SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N3425284749674737464433424341434437374129304140363841474641NANA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643123192544454640313638253438343736273036263335302831383737341991SETRPC 43 Jefferson Co Airport C643
Nederland 17th Street C1035124222846495243364242303841384241333540273437353534414241382291Nederland 17th Street C1035
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
Austin
Austin North Hills Drive C3/A3222453546494456355056583845455350455550413437455134404540383118202Austin North Hills Drive C3/A322
Audubon C38137NANANANANANANA40393135374040344541352933354227313734312012151Audubon C38
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
Houston-Galveston-Brazoria
Houston East C1/G31622825314151524337404134363544474237323123263738323135334335682Houston East C1/G316
Houston Aldine C8/AF108/X150 22520334145473936363429353537403335303624293434243134293428792Houston Aldine C8/AF108/X150
Channelview C15/AH115 32120324151453837343829364240413837263126303835283441374033893Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542292341445249393943383340414741393834382735414127384130363312152Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23912725404248514038394330404142454036323828354037344139374238571Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4512120304554493236363825383841403426273528323836293236383832541Seabrook Friendship Park C45
Houston Bayland Park C53/A146 12723414546514043424131414149454138334125324041353842394031791Houston Bayland Park C53/A146
Conroe Relocated C78/A3211312641435356424049423643435847414334412829434127364339373413151Conroe Relocated C78/A321
Manvel Croix Park C8412523424649523843424631414247454035333728334138353941404132681Manvel Croix Park C84
Clinton C403/C304/AH113 323213355494435403422213536NANA34272541262940372433NANA3631583Clinton C403/C304/AH113
Houston North Wayside C405/C103312419303443433535331325323337382929243522243132232930273226681Houston North Wayside C405/C1033
Houston Monroe C40612121284047434027345229373537393632272925323734323336333629461Houston Monroe C406
Lang C40822621344249483837373930393643433935313325283834243538303630892Lang C408
Houston Croquet C4092262236424447373741392938374643393529342632363833NA38383931682Houston Croquet C409
Houston Westhollow C410/C300311915333739413135363622343440373330292416NANA32263134313324351Houston Westhollow C410/C3003
Park Place C41612523364353503939403830383841433934293624323836323439364033571Park Place C416
Houston Harvard Street C4171292538424753424038392839NANA3938343037222739373034403539347101Houston Harvard Street C417
Sheldon C5511 N2316394247433537323529394234NA3432323825253835313340343730891Sheldon C551
Baytown Wetlands Center C5521 N2014363952453437363325373941393241253929323935293240383925781Baytown Wetlands Center C552
Crosby Library C5531 N2816374446483934383732404243423640333827263937263438373929881Crosby Library C553
West Houston C5541 N252239434947364043413041404742383633382727403826374034352810121West Houston C554
La Porte Sylvan Beach C5561 N1717344148423323353524363839363537243327323533283038373728571La Porte Sylvan Beach C556
Mercer Arboretum C5571 N26183842515239394139313940504339373140263139382734383238308111Mercer Arboretum C557
Tom Bass C5581 N2422384353483540404129394145433933293528313939313738403930481Tom Bass C558
Katy Park C5591 NNANANANANANANANANA362940414743363434392829403626373935372811141Katy Park C559
Atascocita C5601 N2418333744443634343327353640393332283324293435252935343726681Atascocita C560
Meyer Park C5611 N25203842494937373938304039424337363036263138392635392834289111Meyer Park C561
Bunker Hill Village C5621 N2220353943443538383727363745393132273524253531NA3236343328791Bunker Hill Village C562
Huffman Wolf Road C5631 N3118364348504237403932404044443938353925283736243438373630891Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N27243942604642413937NANANANANANANANANANANANANANANANANANANANANA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N24204145625242413941NANANANANANANANANANANANANANANANANANANANANA1Wallisville Road C617
Texas City 34th St. C620 1 N36263752545744464442NANANANANANANANANANANANANANANANANANANANANA1Texas City 34th St. C620
UH Moody Tower C6951 N2520264346503740393830414041433935303823284037293640373932581UH Moody Tower C695
UH WG Jones Forest C6981 N312543453057424148433544446047414237402831424226374334373312151UH WG Jones Forest C698
Lynchburg Ferry C1015/A165 11520263542473229333929373839393835313527343435312537374036681Lynchburg Ferry C1015/A165
Lake Jackson C1016 130284349585444514238314344504945363543343642424242424746411281Lake Jackson C1016
Baytown Garth C10171302541466557474343443344444748405138443234434140394346453912101Baytown Garth C1017
Galveston 99th St. C1034/A320/X183136262449414945423837314142464744313642343841424137424646432181Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N4129425058554451443836474752514738354232333841404347494743NANA1Oyster Creek C1607
Liberty Sam Houston Library C16261 NNA21404668524336434635403941453942333824273738273438404038651Liberty Sam Houston Library C1626
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
San Antonio
San Antonio Northwest C232493541434446304352553540404844455441423039424240404339303516162San Antonio Northwest C23
Camp Bullis C58 1503642444747304455533740424845425644423336444242414338283017171Camp Bullis C58
Calaveras Lake C59144354544434729474949373741464348454439353145NA39414540313414161Calaveras Lake C59
Heritage Middle School C6221 N393241414045274447473437394339434442373032424136394539303512151Heritage Middle School C622
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
Corpus Christi-Victoria
Corpus Christi West C42272341466047334535433241424944403439423627444341453939352819112Corpus Christi West C4
Corpus Christi Tuloso C211322746515547324532393542445044433842433427484241454139362613121Corpus Christi Tuloso C21
Victoria C871252241424944334035363438394842403540362331404131404037342710131Victoria C87
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
Lower Rio Grande Valley
Harlingen Teege C1023136323851554332413933324751534749416047443546464046434038312581Harlingen Teege C1023
AreaMonitoring SitePOCJanuary 2023POCMonitoring Site
12345678910111213141516171819202122232425262728293031
Laredo
Laredo College C441 N423748505440355450504343454946535045473544504344424343364718111Laredo 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.