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Peak Daily One-Hour Ozone Averages for February 2020

The table below lists the peak daily one-hour ozone concentrations measured in February 2020 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 SitePOCFebruary 2020POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2454542302944404037212425272543473633273733382Ft. Worth Northwest C13/AH302
Keller C172414239272641354135222323292944453435313738402Keller C17
Frisco C31/C6801414741302542354438222629343547493736313841401Frisco C31/C680
Midlothian OFW C52/A1371454540302845404333212425273344443529294137421Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571444640282744364436232825332848504336323840431Denton Airport South C56/A163/X157
Arlington Municipal Airport C611404238262641374033202024253143392928263733381Arlington Municipal Airport C61
Dallas North No.2 C63/C6791404542292541344336212626293146463229293737391Dallas North No.2 C63/C679
Rockwall Heath C691424442282641354336212928313643453130344044421Rockwall Heath C69
Grapevine Fairway C70/A301/X1821424238262643364134222525332747433533323840391Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711384642312541394335203029313742453236343841411Kaufman C71/A304/X071
Granbury C73/C6811414041252840384136242530283443463935293842421Granbury C73/C681
Eagle Mountain Lake C75 1444442282945404338243027332947504139314042431Eagle Mountain Lake C75
Parker County C761424441243143394437243032303246474339313942421Parker County C76
Cleburne Airport C77/C6821454539272944424339242429283546503834304038491Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3394339252540323835222527283044412829303835353Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021434644302841364136212321323848463230283836381Dallas Executive Airport C402
Greenville C1006/A1981444542292542364338202930313542463131323741401Greenville C1006/A198
Pilot Point C10321444839292743364437242927363351544438353640421Pilot Point C1032
Italy C1044/A3231434539292441404035182727263441483534354036401Italy C1044/A323
Corsicana Airport C10511454642342241374237NA2825303743463235353941401Corsicana Airport C1051
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C6442454645382037454338302726333737372833333641432Longview C19/A127/C644
Tyler Airport Relocated C821454747362440444540282825333941433435333743431Tyler Airport Relocated C82
Karnack C85/AFHP3031445245381732484540363129353938373235323743451Karnack C85/AFHP303
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151/G1252424039393538374140382738464244454243383130492El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591NANANANANANANANANA272634443741433932363331541Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1454343403740404446402743494052534841373032581Chamizal C41/AH126
Socorro Hueco C49/F3121494941404039404346402737504246464440403533531Socorro Hueco C49/F312
Skyline Park C721444443423840404242412841494548494847453335481Skyline Park C72
Ivanhoe C414/F5141434742413540394844392741484147484541383330541Ivanhoe C414/F514
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
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Waco
Waco Mazanec C10371454940312742494436172526293741454234344241461Waco Mazanec C1037
Temple Georgia C10451454939323042474536181927303641394129324142491Temple Georgia C1045
Killeen Skylark Field C10471444538302941454538191932293841443829334040511Killeen Skylark Field C1047
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
12345678910111213141516171819202122
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2445646412739475542321614313545492927233539492Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412405545392533446242301722313339353125233437502West Orange C9/A141
Port Arthur West C28/A128/A22814355443929384454413115NA333538452615153541441Port Arthur West C28/A128/A228
Hamshire C64/C6541455646402738475341321319333643532827203539501Hamshire C64/C654
SETRPC Port Arthur C6281 N455846403140475239NANANANANANANANANANANANANA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541435544392939454842341721323644543223223439471SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N486651433343536547392423384145403232283944601SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431455849423240466443351822343545593428243840471SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1425646402833455041331521333443402925233538461Nederland High School C1035
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
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Austin
Austin Northwest C3/A3222435139332842434338191724333441423517NANANANA2Austin Northwest C3/A322
Audubon C381425040322841414538141523313339353727283740511Audubon C38
St. Edwards University C16051 N384535342437393732151420283238382624243437461St. Edwards University C1605
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G31624453434012374751352366273534373025103332462Houston East C1/G316
Houston Aldine C8/AF108/X150 244544137154049533722813353837402325183739542Houston Aldine C8/AF108/X150
Channelview C15/AH115 344524138124044492723813323434442424133538453Channelview C15/AH115
Northwest Harris Co. C26/A110/X154244564339174051553822915384044483029173741542Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239144534339153946553725510333637642928133438501Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45143503936213844473023712313933642218193034491Seabrook Friendship Park C45
Houston Bayland Park C53/A146 147544542164248534125712403639622925143542561Houston Bayland Park C53/A146
Conroe Relocated C78/A3211NANA40381740525038251116NA3439402828223537541Conroe Relocated C78/A321
Manvel Croix Park C84147554238143946483923511344038562326153538531Manvel Croix Park C84
Clinton C403/C304/AH113 34147383612333554362076333635382817NANANANA3Clinton C403/C304/AH113
Houston North Wayside C40513543353111333745331979293232332120153233431Houston North Wayside C405
Houston Monroe C40614149403622374249372338283334462922103233431Houston Monroe C406
Lang C40824451413915404750372159323435442622113335522Lang C408
Houston Croquet C409244494037133743473722410343434552924103237522Houston Croquet C409
Houston Westhollow C410145504138153948523722712353637543025133440521Houston Westhollow C410
Park Place C4161NANA38371837425037235830353542292493134441Park Place C416
Sheldon C5511 N46524237144146493021914353733392323183741531Sheldon C551
Baytown Wetlands Center C5521 N455237342037455238241014353637652524183740521Baytown Wetlands Center C552
Crosby Library C5531 N41483731113742493318510293132381917143335401Crosby Library C553
West Houston C5541 N213432311023274530123216243039231082726411West Houston C554
La Porte Sylvan Beach C5561 N44534236143944493425715333935672419183437501La Porte Sylvan Beach C556
Mercer Arboretum C5571 N43504034133952513419711333736352123183537551Mercer Arboretum C557
Tom Bass C5581 N4552413718384452382249313734622826113436491Tom Bass C558
Katy Park C5591 N45504138184148543520813343742532723133640511Katy Park C559
Atascocita C5601 N41503935143845503221913313534362123203538561Atascocita C560
Meyer Park C5611 N475444391742535640241013364140392827183641511Meyer Park C561
Bunker Hill Village C5621 N43503935143845493620610363635502321133339521Bunker Hill Village C562
Huffman Wolf Road C5631 N465644381643495339231116363737432928243843601Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N4350403612374151302179313735392523133438441HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N485543392441485742291115363939462927213741531Wallisville Road C617
Danciger C618 1 N15214543184349524225NANANANANANANANANANANANA1Danciger C618
Texas City 34th St. C620 1 N505748453144525643261020394545853931234042531Texas City 34th St. C620
UH Moody Tower C6951 N45544439134046544023512242517322927133439491UH Moody Tower C695
UH WG Jones Forest C6981 N465544391641535138231116373741392829213730NA1UH WG Jones Forest C698
UH West Liberty C6991 N43514235143945503623914343432413224193536551UH West Liberty C699
Lynchburg Ferry C1015/A165 13753423883543512822711283534432423153234451Lynchburg Ferry C1015/A165
Lake Jackson C1016 147514643224248484226516374447603229203744531Lake Jackson C1016
Baytown Garth C10171445240382439455440281014333637452826193538521Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831495146413542455240312122364241603826213642521Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N424743392738455239261021324243653030233445481Oyster Creek C1607
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
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San Antonio
San Antonio Northwest C232425136432741444134221930373641383629273239522San Antonio Northwest C23
Camp Bullis C58 1465434342745473631161734384039333228253238551Camp Bullis C58
Calaveras Lake C591475340462842504935231727394646413531283643531Calaveras Lake C59
Fair Oaks Ranch C5021 NNANANANANANANANANANANANANANANANANANANANA34501Fair Oaks Ranch C502
Bulverde Elementary C5031 NNANANANANANANANANANANANANANANANANANANANA33481Bulverde Elementary C503
New Braunfels Airport C5041 NNANANANANANANANANANANANANANA32373128233035491New Braunfels Airport C504
City of Garden Ridge C5051 NNANANANANANANANANANANANANANANANANANANA3138481City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 NNANANANANANANANANANANANANANANANANANANA3036481Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N424834362234413929171326211215121219182422271Heritage Middle School C622
CPS Pecan Valley C6781 NNANANANANANANANANANANANANANANA403326222536481CPS Pecan Valley C678
Government Canyon C16101 NNANANANANANANANANANANANANANANANANANANANANA451Government Canyon C1610
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4246494238313946413821219383840322322142440412Corpus Christi West C4
Corpus Christi Tuloso C211454640362439413936201711403544372526172944471Corpus Christi Tuloso C21
Victoria C871485243421939484439201014393747372624173440511Victoria C87
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
12345678910111213141516171819202122
Lower Rio Grande Valley
Mission C43/AP1431414037332539353831241812473939312728182739411Mission C43/AP143
Harlingen Teege C10231414238362940373833222111373639282326212337401Harlingen Teege C1023
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
12345678910111213141516171819202122
Laredo
Laredo Vidaurri C44/AFGP144/P2441414632342640464137401132424238503539222540421Laredo 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.