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Daily Maximum Eight-Hour Ozone Averages for December 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in December 2018 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 SitePOCDecember 2018
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 23431251821199102831342418NA
Keller C17235332621242211122833362421NA
Frisco C31/C680137322523262214143230362723NA
Midlothian OFW C52/A137136312520272412133133403024NA
Denton Airport South C56/A163/X157136302318232210133034352421NA
Arlington Municipal Airport C61132302515262410133026382922NA
Dallas North No.2 C63/C679137312521252113133225382922NA
Rockwall Heath C69136312621262015143228402924NA
Grapevine Fairway C70/A301/X182137322621222213123132372620NA
Kaufman C71/A304/X071138322724302816163229423027NA
Granbury C73/C681138333022282212142534402323NA
Eagle Mountain Lake C75 1373429NANV2713132938412621NA
Parker County C76138353024322714152942402823NA
Cleburne Airport C77/C682141352819312613132941413021NA
Dallas Hinton St. C401/C60/AH161 335322621231914143017362819NA
Dallas Executive Airport C402137302619252314143126403223NA
Greenville C1006/A198137312324252117163033393028NA
Pilot Point C1032136312523232313153434372522NA
Italy C1044/A323140322720302516143137423125NA
Corsicana Airport C1051140322923312615162931403428NA
AreaMonitoring SitePOCDecember 2018
Longview C19/A127/C644240322923272417172430383631NA
Tyler Airport Relocated C8214133NV26322816172936423634NA
Karnack C85/AFHP303138292622271917182129353331NA
AreaMonitoring SitePOCDecember 2018
El Paso-Juarez
El Paso UTEP C12/A125/X151/G125239383132NVNANV142831233635NA
Ascarate Park SE C37/A332/A172/X159135403637321711112231143839NA
Chamizal C41/AH126 142433832291611122832214141NA
Socorro Hueco C49/F312137373439402315193230164139NA
Skyline Park C72144434140433119143235234342NA
BRAVO Big Bend C67/C316/C656/C6913 N42404441393124183134313740NA
Ivanhoe C414/F5141404239393519NV153033173636NA
AreaMonitoring SitePOCDecember 2018
Waco Mazanec C1037138302620272216142434393124NA
Temple Georgia C1045140322923272313192235423230NA
Killeen Skylark Field C1047143332524302712222538443532NA
AreaMonitoring SitePOCDecember 2018
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 238393028302725192032NV2830NA
West Orange C9/A141242383127303036312030383633NA
Port Arthur West C28/A128/A228142423228312828202030363132NA
Hamshire C64/C654143383228323335212033394039NA
SETRPC Port Arthur C6281 N42433329283336211932382933NA
SETRPC 40 Sabine Pass C640/C1654141473128313434222232403735NA
SETRPC Mauriceville 42 C642/C311/C6651 N40363127293134282131363333NA
SETRPC 43 Jefferson Co Airport C643146443331333438262232403736NA
Nederland High School C1035 141383027303131201930363231NA
AreaMonitoring SitePOCDecember 2018
Austin Northwest C3/A32223833302325249212433382833NA
Audubon C38143353324282810212533433436NA
St. Edwards University C16051 N3633312322185111010618NA
AreaMonitoring SitePOCDecember 2018
Houston East C1/G316232342222241920131724283632NA
Houston Aldine C8/AF108/X150 242363327271718131831303736NA
Channelview C15/AH115 33939312825201914193129NVNANA
Northwest Harris Co. C26/A110/X154241373730281114141936383940NA
Hou.DeerPrk2 C35/235/1001/AFH139FP23913940NV29273128131827374035NA
Seabrook Friendship Park C4513935NV23322728131726363934NA
Houston Bayland Park C53/A146 136382723251923101729343231NA
Conroe Relocated C78/A321141383631332724161936353237NA
Manvel Croix Park C84139403025293131131931393838NA
Clinton C403/C304/AH113 3333732282322211115253035NVNA
Houston North Wayside C4051273328242316151014222330NVNA
Houston Monroe C406132272117212022111322283229NA
Lang C408236352520221919121628333531NA
Houston Croquet C409237372923282428111730383635NA
Houston Westhollow C410137393226262120111630383635NA
Park Place C416134332721252225111424343530NA
Baytown Wetlands Center C5521 N28322723212120101627322620NA
Crosby Library C5531 N34332723242223121729312727NA
Katy Park C5591 N2927262218151271121302827NA
Atascocita C5601 N29282521211916101321262723NA
Meyer Park C5611 N24222117168881119202122NA
Huffman Wolf Road C5631 N201817141510147917181816NA
HRM-3 Haden Road C603/A114 1 N40413027272020141828293230NA
Wallisville Road C617 1 N41463732313435192339414035NA
Danciger C618 1 N41403428344034142135434139NA
Texas City 34th St. C620 1 N4242NVNVNANANANANANANV4136NA
UH Moody Tower C6951 N42413327272429NVNV333939NVNA
UH WG Jones Forest C6981 N43373630312117151839333439NA
UH West Liberty C6991 N40353228292228141935383634NA
Lynchburg Ferry C1015/A165 133282623262622131526332229NA
Lake Jackson C1016 140463333344035142035414136NA
Baytown Garth C1017139403529303132162034393634NA
Galveston 99th St. C1034/A320/X183139413128383932142330454338NA
Oyster Creek C1607 1 N42493631404336152135474236NA
AreaMonitoring SitePOCDecember 2018
San Antonio
San Antonio Northwest C23241373426252212273337352635NA
Camp Bullis C58 141373525242112283337352636NA
Calaveras Lake C59141413532292711223228403036NA
Heritage Middle School C6221 N41393227252310233232403035NA
AreaMonitoring SitePOCDecember 2018
Corpus Christi-Victoria
Corpus Christi West C4240503833414031193132383535NA
Corpus Christi Tuloso C21136413329323626162932343233NA
Victoria C871NANANANANANVNV192334363334NA
Violet C6641 N37463730333927193436393636NA
Ingleside C6851 N40463934424135213234413838NA
AreaMonitoring SitePOCDecember 2018
Lower Rio Grande Valley
Mission C43/AP143133384037293117102631342933NA
Harlingen Teege C1023140404336373725123137393638NA
AreaMonitoring SitePOCDecember 2018
Laredo Vidaurri C44/AFGP144/P24413538283626278172528322634NA
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.