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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 2018
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2312731264343363321332931343332
Keller C17233303429464842342338NA33373633
Frisco C31/C6801333136394248NANANANANANANANANA
Midlothian OFW C52/A1371333131364848413426403133353935
Denton Airport South C56/A163/X1571322936364643343316262932363335
Arlington Municipal Airport C611323034294648413324383332374036
Dallas North No.2 C63/C6791332932354548413121323234363734
Rockwall Heath C691363438494350403322303337393737
Grapevine Fairway C70/A301/X1821333236324548423317313232363736
Kaufman C71/A304/X0711353233414652403623303235363839
Granbury C73/C6811342938394848393938403137374035
Eagle Mountain Lake C75 1353137324949413725383436373937
Parker County C761333036354546373739393236354041
Cleburne Airport C77/C6821343138394948393941413236364133
Dallas Hinton St. C401/C60/AH161 3343031334447413320303233353836
Dallas Executive Airport C4021323130304046403221323131313735
Greenville C1006/A1981323036404555383422292935333735
Pilot Point C10321323137384347383323303233353334
Italy C1044/A3231NANANA394949393427383133364038
Corsicana Airport C10511363232414952413724353433364044
AreaMonitoring SitePOCJanuary 2018
Longview C19/A127/C6442363334394646443425273434352844
Tyler Airport Relocated C821373332425047423724273037353944
Karnack C85/AFHP3031353434394246332726243734352942
AreaMonitoring SitePOCJanuary 2018
El Paso-Juarez
El Paso UTEP C12/A125/X1512262940223836413635424039404347
Ascarate Park SE C37/A332/A172/X1591NANA412032NANA3529394232404137
Chamizal C41/AH126 1263140203840413729434339394544
Socorro Hueco C49/F3121243142193336373328384036404445
Skyline Park C721303646283642434138464339484446
BRAVO Big Bend C67/C316/C656/C6913 N282641364041414442454641404446
Ivanhoe C4141243542263638393834464239444436
AreaMonitoring SitePOCJanuary 2018
Waco Mazanec C10371323132394645343433392934344138
Temple Georgia C10451313140364448394142413139354343
Killeen Skylark Field C10471313342404848404140443540384642
AreaMonitoring SitePOCJanuary 2018
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2373238393944363427263832353746
West Orange C9/A1412363347403848373225353730353243
Port Arthur West C28/A128/A2281362935383946353727323832343441
Hamshire C64/C6541363238403947403829314132363145
SETRPC 40 Sabine Pass C640/C16541353236364247383527314133363245
SETRPC 43 Jefferson Co Airport C6431373337394148394228313833353444
Nederland High School C1035 1353035344146393828354032363745
AreaMonitoring SitePOCJanuary 2018
Austin Northwest C3/A3222303036334242403938443638354542
Audubon C381313139334342393738443638394543
St. Edwards University C16051 N27273233383737373824NANANANANA
AreaMonitoring SitePOCJanuary 2018
Houston East C1/G3162343328363243373323273028323441
Houston Aldine C8/AF108/X150 2373334383553383823253331343740
Channelview C15/AH115 3363333393141333623232730363335
Northwest Harris Co. C26/A110/X1542363338413653403919243434354246
Hou.DeerPrk2 C35/235/1001/AFH139FP2391353130353947363728283329333340
Seabrook Friendship Park C451333228393742333329293526313535
Houston Bayland Park C53/A146 1343329293443363321213027293041
Conroe Relocated C78/A3211373536444555404026293733354446
Manvel Croix Park C841373336354251454127324434353545
Clinton C403/C304/AH113 3373429353545333422252128323438
Houston North Wayside C4051343228332744313219222026283136
Houston Monroe C4061333130303241333424253229293038
Lang C4082353232352847303423263230323541
Houston Croquet C4092343133323543393624253730323041
Houston Westhollow C4101353233353748403524263931353243
Park Place C4161322927303444343323262927273241
Baytown Wetlands Center C5521 N312928403538292822222424312935
Tom Bass C5581 N132425103237172519202821152238
Katy Park C5591 N292627332940312512182224252433
Atascocita C5601 N353231363751353523241827343943
Meyer Park C5611 N242425282440262714161922252931
HRM-3 Haden Road C603/A114 1 N363331383142343620222429362537
Wallisville Road C617 1 N393637444250433728333534403645
Danciger C618 1 N323035384446NANANANANANANANANA
Texas City 34th St. C620 1 N393735484651444333363931383744
UH Moody Tower C6951 N363231333447373725263531313144
UH WG Jones Forest C6981 N363536403656374026213533353844
UH West Liberty C6991 N363334394350413426273332362543
Lynchburg Ferry C1015/A165 1323128363642333323251928293336
Lake Jackson C1016 1353435414648454131404236334143
Baytown Garth C10171383435414350443628323832383644
Galveston 99th St. C1034/A320/X1831363131444447393832413829333539
Oyster Creek C1607 1 N333332414646424033374233344143
AreaMonitoring SitePOCJanuary 2018
San Antonio
San Antonio Northwest C232282842404644373838473740384843
Camp Bullis C58 1293144384642384037483842404843
Calaveras Lake C591302937485245404146503941355044
Heritage Middle School C6221 NNANANANANANANA2644493839334641
AreaMonitoring SitePOCJanuary 2018
Corpus Christi-Victoria
Corpus Christi West C42293137464547444549474541414342
Corpus Christi Tuloso C211262734404239404241434237354041
Victoria C871262829374145403842393936323938
Holly Road C6601 N171916323134343536353630323635
Violet C6641 N313435424447495256453827253229
AreaMonitoring SitePOCJanuary 2018
Lower Rio Grande Valley
Mission C43/AP1431232332454439363851434039384137
Brownsville C80/AGP18012123294042NANANANANANANANANANA
Harlingen Teege C10231242734474743404145474241434541
AreaMonitoring SitePOCJanuary 2018
Laredo Vidaurri C44/AFGP144/P2441NANA21333733263534402831313632
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.