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Peak Daily One-Hour Ozone Averages for January 2018

The table below lists the peak daily one-hour ozone concentrations measured in January 2018 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 2018POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 231273126434336332133293134333230253028342Ft. Worth Northwest C13/AH302
Keller C17233303429464842342338NA3337363333293332382Keller C17
Frisco C31/C6801333136394248NANANANANANANANANANANANANANA1Frisco C31/C680
Midlothian OFW C52/A137133313136484841342640313335393534303232381Midlothian OFW C52/A137
Denton Airport South C56/A163/X157132293636464334331626293236333531322825311Denton Airport South C56/A163/X157
Arlington Municipal Airport C61132303429464841332438333237403634283331391Arlington Municipal Airport C61
Dallas North No.2 C63/C679133293235454841312132323436373433252929361Dallas North No.2 C63/C679
Rockwall Heath C69136343849435040332230333739373735383131331Rockwall Heath C69
Grapevine Fairway C70/A301/X182133323632454842331731323236373633283030371Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071135323341465240362330323536383935353434311Kaufman C71/A304/X071
Granbury C73/C681134293839484839393840313737403536363034411Granbury C73/C681
Eagle Mountain Lake C75 135313732494941372538343637393737383634391Eagle Mountain Lake C75
Parker County C76133303635454637373939323635404136343335401Parker County C76
Cleburne Airport C77/C682134313839494839394141323636413336343333421Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 334303133444741332030323335383633242929353Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402132313030404640322132313131373534273028341Dallas Executive Airport C402
Greenville C1006/A198132303640455538342229293533373533333431321Greenville C1006/A198
Pilot Point C1032132313738434738332330323335333433352930371Pilot Point C1032
Italy C1044/A3231NANANA39494939342738313336403835333431351Italy C1044/A323
Corsicana Airport C1051136323241495241372435343336404434343634341Corsicana Airport C1051
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Longview C19/A127/C644236333439464644342527343435284436354039352Longview C19/A127/C644
Tyler Airport Relocated C82137333242504742372427303735394436364038351Tyler Airport Relocated C82
Karnack C85/AFHP303135343439424633272624373435294233333535341Karnack C85/AFHP303
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151226294022383641363542403940434735333839412El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X1591NANA412032NANA352939423240413736343235NA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 126314020384041372943433939454437383942431Chamizal C41/AH126
Socorro Hueco C49/F312124314219333637332838403640444535343437421Socorro Hueco C49/F312
Skyline Park C72130364628364243413846433948444640393745451Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N28264136404141444245464140444638373339453BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414124354226363839383446423944443638333138431Ivanhoe C414
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Waco Mazanec C1037132313239464534343339293434413831323130341Waco Mazanec C1037
Temple Georgia C1045131314036444839414241313935434335333130371Temple Georgia C1045
Killeen Skylark Field C1047131334240484840414044354038464237353232421Killeen Skylark Field C1047
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 237323839394436342726383235374637NANANANA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A141236334740384837322535373035324332353434422West Orange C9/A141
Port Arthur West C28/A128/A228136293538394635372732383234344134343432401Port Arthur West C28/A128/A228
Hamshire C64/C654136323840394740382931413236314532373336421Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C1654135323636424738352731413336324531353332431SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C643137333739414839422831383335344435363436381SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 135303534414639382835403236374535353336371Nederland High School C1035
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Austin Northwest C3/A322230303633424240393844363835454235312924312Austin Northwest C3/A322
Audubon C38131313933434239373844363839454337322827371Audubon C38
St. Edwards University C16051 N27273233383737373824NANANANANANANANANANA1St. Edwards University C1605
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Houston East C1/G316234332836324337332327302832344133322324362Houston East C1/G316
Houston Aldine C8/AF108/X150 237333438355338382325333134374035332829362Houston Aldine C8/AF108/X150
Channelview C15/AH115 336333339314133362323273036333533342625193Channelview C15/AH115
Northwest Harris Co. C26/A110/X154236333841365340391924343435424635362735382Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239135313035394736372828332933334030312732371Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45133322839374233332929352631353531293030331Seabrook Friendship Park C45
Houston Bayland Park C53/A146 134332929344336332121302729304130312120331Houston Bayland Park C53/A146
Conroe Relocated C78/A321137353644455540402629373335444636363542421Conroe Relocated C78/A321
Manvel Croix Park C84137333635425145412732443435354534343230381Manvel Croix Park C84
Clinton C403/C304/AH113 337342935354533342225212832343831322222293Clinton C403/C304/AH113
Houston North Wayside C405134322833274431321922202628313630311924NA1Houston North Wayside C405
Houston Monroe C406133313030324133342425322929303831322324301Houston Monroe C406
Lang C408235323235284730342326323032354131332018332Lang C408
Houston Croquet C409234313332354339362425373032304129312425352Houston Croquet C409
Houston Westhollow C410135323335374840352426393135324333332123351Houston Westhollow C410
Park Place C416132292730344434332326292727324133292325331Park Place C416
Baytown Wetlands Center C5521 N312928403538292822222424312935272926NANA1Baytown Wetlands Center C552
Tom Bass C5581 N13242510323717251920282115223828292521311Tom Bass C558
Katy Park C5591 N29262733294031251218222425243324291122251Katy Park C559
Atascocita C5601 N35323136375135352324182734394331323336271Atascocita C560
Meyer Park C5611 N24242528244026271416192225293124262024241Meyer Park C561
HRM-3 Haden Road C603/A114 1 N36333138314234362022242936253735312123261HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N39363744425043372833353440364535373134391Wallisville Road C617
Danciger C618 1 N323035384446NANANANANANANANANANANANANANA1Danciger C618
Texas City 34th St. C620 1 N39373548465144433336393138374434353236401Texas City 34th St. C620
UH Moody Tower C6951 N36323133344737372526353131314432332225351UH Moody Tower C695
UH WG Jones Forest C6981 N36353640365637402621353335384436363241381UH WG Jones Forest C698
UH West Liberty C6991 N36333439435041342627333236244332343236361UH West Liberty C699
Lynchburg Ferry C1015/A165 132312836364233332325192829333631312828201Lynchburg Ferry C1015/A165
Lake Jackson C1016 135343541464845413140423633414334353137401Lake Jackson C1016
Baytown Garth C1017138343541435044362832383238364433353134381Baytown Garth C1017
Galveston 99th St. C1034/A320/X183136313144444739383241382933353935323233411Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N33333241464642403337423334414332403138371Oyster Creek C1607
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
San Antonio
San Antonio Northwest C23228284240464437383847374038484337332831292San Antonio Northwest C23
Camp Bullis C58 129314438464238403748384240484338352830291Camp Bullis C58
Calaveras Lake C59130293748524540414650394135504438343529281Calaveras Lake C59
Heritage Middle School C6221 N29293646474538424449383933464135322926261Heritage Middle School C622
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C4229313746454744454947454141434230303124352Corpus Christi West C4
Corpus Christi Tuloso C21126273440423940424143423735404129282920341Corpus Christi Tuloso C21
Victoria C87126282937414540384239393632393829302727341Victoria C87
Holly Road C6601 N17191632313434353635363032363523151715221Holly Road C660
Violet C6641 N31343542444749525645382725322923222813161Violet C664
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP143123233245443936385143403938413732312623341Mission C43/AP143
Brownsville C80/AGP18012123294042NANANANANANANANANANANANANANANA1Brownsville C80/AGP180
Harlingen Teege C1023124273447474340414547424143454138312522371Harlingen Teege C1023
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P2441NANA2133373326353440283131363227292523271Laredo 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.