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Daily Maximum Eight-Hour Ozone Averages for January 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in January 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 SitePOCJanuary 2018POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 22924261936393226162726283028272821192Ft. Worth Northwest C13/AH302
Keller C17231282925404436291731NANV3332303226122Keller C17
Frisco C31/C68013129293533NVNANANANANANANANANANANANA1Frisco C31/C680
Midlothian OFW C52/A13713129263242453429223431313134313126231Midlothian OFW C52/A137
Denton Airport South C56/A163/X15712928303137392928142227303229273028151Denton Airport South C56/A163/X157
Arlington Municipal Airport C6112927NV2240433529203130303133303224211Arlington Municipal Airport C61
Dallas North No.2 C63/C67913027253136443627192631293232303221171Dallas North No.2 C63/C679
Rockwall Heath C691343230NV3846372819NV32333633333433191Rockwall Heath C69
Grapevine Fairway C70/A301/X18213129312836413528152729313232323226191Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07113230263740483832222631323334333330251Kaufman C71/A304/X071
Granbury C73/C68113227303341433534333730353335313533141Granbury C73/C681
Eagle Mountain Lake C75 13229332645443532203332343535323532231Eagle Mountain Lake C75
Parker County C7613128333242433334343631343337343431271Parker County C76
Cleburne Airport C77/C682131293135444534333235313433363035NVNA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 33228232935423528172530293133323219173Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40213028242634423427192629292832303223241Dallas Executive Airport C402
Greenville C1006/A19813029303638483730202628323031313230221Greenville C1006/A198
Pilot Point C103212930313432413529202829313129303230171Pilot Point C1032
Italy C1044/A3231NANANANV42453230203229303134333229251Italy C1044/A323
Corsicana Airport C105113331273844483732192929303336373332261Corsicana Airport C1051
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Longview C19/A127/C64423530313542443529212527313225393531252Longview C19/A127/C644
Tyler Airport Relocated C8213532303845463735202629343335383433301Tyler Airport Relocated C82
Karnack C85/AFHP30313432303637413025242126303225363231211Karnack C85/AFHP303
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X15122224291028283629204037303332363228152El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X1591NANV3016NVNANANV173637253235313430181Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 12224261326223627154138313232333130201Chamizal C41/AH126
Socorro Hueco C49/F31212025321122233223213634273336353332141Socorro Hueco C49/F312
Skyline Park C721262937233136373529NV40314138373936281Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N272437333840414239NV43393841433734293BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C41412130331929293531234339313738333531201Ivanhoe C414
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Waco Mazanec C103713030263440423231253529313036332929191Waco Mazanec C1037
Temple Georgia C104512930333239423637353731363137353430201Temple Georgia C1045
Killeen Skylark Field C104713031363442413738363930363440323533191Killeen Skylark Field C1047
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2353034343436312423233130313138NVNANA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A14123430353433423324202932283128393132312West Orange C9/A141
Port Arthur West C28/A128/A22813426322835423329232534303129383032271Port Arthur West C28/A128/A228
Hamshire C64/C65413428343537423629272936313228423135251Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C165413327323438443427212936303129412931281SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C64313530333136433630252836313231403133271SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 13328312937423528252936293230403132261Nederland High School C1035
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Austin Northwest C3/A32222826312735373536303729343137383429182Austin Northwest C3/A322
Audubon C3812928343038363534323930353340373531201Audubon C38
St. Edwards University C16051 N262525273232333430NVNANANANANANANANA1St. Edwards University C1605
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Houston East C1/G31623226252828362828222023242728333129172Houston East C1/G316
Houston Aldine C8/AF108/X150 23430313227422934211827302931333231212Houston Aldine C8/AF108/X150
Channelview C15/AH115 33429303324362531201625293227283232213Channelview C15/AH115
Northwest Harris Co. C26/A110/X15423431333527443534191829323134383333222Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23913227283035413032251926272930362929241Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4513229273233382728272423242733322527261Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1312826252737292818162325252738282971Houston Bayland Park C53/A146
Conroe Relocated C78/A32113633334039503536232728323237423434271Conroe Relocated C78/A321
Manvel Croix Park C8413528322936453836263033323031423232261Manvel Croix Park C84
Clinton C403/C304/AH113 33431273130402929211923252728342931163Clinton C403/C304/AH113
Houston North Wayside C40513128252723362427171522242425292828151Houston North Wayside C405
Houston Monroe C40613026262528372828221825272426342728181Houston Monroe C406
Lang C40823227282722372629191826282726323030132Lang C408
Houston Croquet C40923127292630393332221928282727382828152Houston Croquet C409
Houston Westhollow C41013329303032433532221928283029403130141Houston Westhollow C410
Park Place C41613025222530403028211923242329362627161Park Place C416
Baytown Wetlands Center C5521 N2926253031362326181817222725332626191Baytown Wetlands Center C552
Tom Bass C5581 N102216825NVNV20161519181019352825191Tom Bass C558
Katy Park C5591 N262323242335271510111721222029222581Katy Park C559
Atascocita C5601 N3329283232442830201922262830382830251Atascocita C560
Meyer Park C5611 N2322232519322024131220212224252424171Meyer Park C561
HRM-3 Haden Road C603/A114 1 N332829332837253118162427281831NV29161HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N3734354136443534262827333632423434251Wallisville Road C617
Danciger C618 1 N3027313339NVNANANANANANANANANANANANA1Danciger C618
Texas City 34th St. C620 1 N3833334043483937313227303335413233281Texas City 34th St. C620
UH Moody Tower C6951 N332928293041313222NV2629272838303071UH Moody Tower C695
UH WG Jones Forest C6981 N353235373249313722NV29323235403334151UH WG Jones Forest C698
UH West Liberty C6991 N343033353843343125NV263032NV3930NVNA1UH West Liberty C699
Lynchburg Ferry C1015/A165 13029263131362429201523262629322928221Lynchburg Ferry C1015/A165
Lake Jackson C1016 1333232364045413829383233303841NV31241Lake Jackson C1016
Baytown Garth C101713532323837453633262927313432423233261Baytown Garth C1017
Galveston 99th St. C1034/A320/X18313428293341443732273635272836373030251Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N3130293740453736303636313037413034231Oyster Creek C1607
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
San Antonio
San Antonio Northwest C2322726323538373436324230363442373530232San Antonio Northwest C23
Camp Bullis C58 12829383433343538304331383740353631251Camp Bullis C58
Calaveras Lake C59128NV31NV43403639384432383143403630291Calaveras Lake C59
Heritage Middle School C6221 N2727314043403436394230362942383428251Heritage Middle School C622
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C422729324239424140454440373739402928262Corpus Christi West C4
Corpus Christi Tuloso C2112426303235363737374138343237382727261Corpus Christi Tuloso C21
Victoria C8712627253134403735373530343036362628231Victoria C87
Holly Road C6601 N1517NVNV25283228323231242732321814131Holly Road C660
Violet C6641 N2932303738423841454134252227262221231Violet C664
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP14312122264038363433384037373438352829241Mission C43/AP143
Brownsville C80/AGP180120212532NVNANANANANANANANANANANANANA1Brownsville C80/AGP180
Harlingen Teege C102312324294445423937414339383942392829221Harlingen Teege C1023
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P2441NANANV2332292429283525212732292425191Laredo 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.