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Peak Daily One-Hour Ozone Averages for December 2017

The table below lists the peak daily one-hour ozone concentrations measured in December 2017 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 SitePOCDecember 2017
12345678910
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 248463730323034363841
Keller C17252494032343534364042
Frisco C31/C680144554431333535333841
Midlothian OFW C52/A137153484627322729373843
Denton Airport South C56/A163/X157145473829313431373739
Arlington Municipal Airport C61149473832312833363841
Dallas North No.2 C63/C679146534230313032303842
Rockwall Heath C69154534030333336404044
Grapevine Fairway C70/A301/X182147523931343333303840
Kaufman C71/A304/X071150544633343135394144
Granbury C73/C681151463331363136374044
Eagle Mountain Lake C75 153494233363636394043
Parker County C76150433833353335383940
Cleburne Airport C77/C682154463933343537444547
Dallas Hinton St. C401/C60/AH161 350513932332835303942
Dallas Executive Airport C402150473931312432343740
Greenville C1006/A198147535033333534383739
Pilot Point C1032142534732343535353840
Italy C1044/A323155534033342331404144
Corsicana Airport C1051151564735352833394144
AreaMonitoring SitePOCDecember 2017
12345678910
Tyler-Longview-Marshall
Longview C19/A127/C644246625537292632374244
Tyler Airport Relocated C82148645333342334394243
Karnack C85/AFHP303143615832322533364044
AreaMonitoring SitePOCDecember 2017
12345678910
El Paso-Juarez
El Paso UTEP C12/A125/X151234344841302834343742
Ascarate Park SE C37/A332/A172/X159128344437242431282938
Chamizal C41/AH126 138385246292833373746
Socorro Hueco C49/F312134354641312533323339
Skyline Park C72136364948353237343143
BRAVO Big Bend C67/C316/C656/C6913 N46424345443140413538
Ivanhoe C414140385346332835313645
AreaMonitoring SitePOCDecember 2017
12345678910
Waco
Waco Mazanec C1037152483837321930384341
Temple Georgia C1045160644040362835414648
Killeen Skylark Field C1047158514435342634374344
AreaMonitoring SitePOCDecember 2017
12345678910
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 249663231262832274146
West Orange C9/A141247643329293030243942
Port Arthur West C28/A128/A228151613133283132264346
Hamshire C64/C654151643333303134314642
SETRPC 40 Sabine Pass C640/C1654158583332313233584143
SETRPC 43 Jefferson Co Airport C643152673434322833274447
Nederland High School C1035 147723134282731244049
AreaMonitoring SitePOCDecember 2017
12345678910
Austin
Austin Northwest C3/A322255573433312535294141
Audubon C38155563435332533354038
St. Edwards University C16051 N49493327282431243837
AreaMonitoring SitePOCDecember 2017
12345678910
Houston-Galveston-Brazoria
Houston East C1/G316248702934252425273339
Houston Aldine C8/AF108/X150 253923337272526323943
Channelview C15/AH115 349572832262830333942
Northwest Harris Co. C26/A110/X1542NANANANA303033364145
Hou.DeerPrk2 C35/235/1001/AFH139FP239151603635272730303842
Seabrook Friendship Park C45151553834303032293941
Houston Bayland Park C53/A146 156673732283027323943
Conroe Relocated C78/A321149704540313233404246
Manvel Croix Park C84154654235283029334145
Clinton C403/C304/AH113 352763728272728263436
Houston North Wayside C405148752628262627273334
Houston Monroe C406151523630242324283737
Lang C408251672730262527303841
Houston Croquet C409252633532252625313641
Houston Westhollow C410155693532292829323743
Park Place C416148603632232323263435
Baytown Wetlands Center C5521 N42442220202221273130
La Porte Sylvan Beach C5561 N4947353124302830NANA
Tom Bass C5581 N3447293015820231816
Katy Park C5591 N52552725232324283436
Atascocita C5601 N52703328252425303641
Meyer Park C5611 N39552021232019242729
Clear Brook High School C5701 N58573631252629283838
Clear Creek High School C5711 N52522927202323303942
HRM-3 Haden Road C603/A114 1 N49673132262628303739
Wallisville Road C617 1 N51573532273334364144
Danciger C618 1 N62583433252730313943
Texas City 34th St. C620 1 N68674736324141354044
UH Moody Tower C6951 N52623433262626303916
U of H-Sugarland C6961 N60613935283029333943
UH Coastal Center C6971 N6661333028343529343
UH WG Jones Forest C6981 N55714037313232374128
UH West Liberty C6991 N44513332262831343810
Lynchburg Ferry C1015/A165 148543033272827283538
Lake Jackson C1016 163573636313031364046
Baytown Garth C1017151583835273133343942
Galveston 99th St. C1034/A320/X183152644635283537324138
Oyster Creek C1607 1 N62574033293233304145
AreaMonitoring SitePOCDecember 2017
12345678910
San Antonio
San Antonio Northwest C23262523233313033384441
Camp Bullis C58 165552528262727NANANA
Calaveras Lake C59167523234302833384344
Heritage Middle School C6221 N59473129262429324038
AreaMonitoring SitePOCDecember 2017
12345678910
Corpus Christi-Victoria
Corpus Christi West C4260524035313034344446
Corpus Christi Tuloso C21152473230272628294045
Victoria C87155513031262528283843
Holly Road C6601 N43372122171923202630
Violet C6641 N4346323318283427NANA
Ingleside C6851 N56473130252933323236
AreaMonitoring SitePOCDecember 2017
12345678910
Lower Rio Grande Valley
Mission C43/AP143146362825282126273740
Brownsville C80/AGP180146363228282328304144
Harlingen Teege C1023146383327272229304046
AreaMonitoring SitePOCDecember 2017
12345678910
Laredo
Laredo Vidaurri C44/AFGP144/P244140382330192426303337
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.