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Daily Maximum Eight-Hour Ozone Averages for February 2020

The table below lists the peak daily maximum eight-hour ozone concentrations measured in February 2020 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 SitePOCFebruary 2020POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 23741352127403534321719232421394030NA2Ft. Worth Northwest C13/AH302
Keller C1723537321824363237312021202724404031NA2Keller C17
Frisco C31/C68013342352323383140332325233031414532NA1Frisco C31/C680
Midlothian OFW C52/A13713942352525403440271922222429403931NA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X15713842351926403339322225233026434336NA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C6113138332024363237301719182126383626NA1Arlington Municipal Airport C61
Dallas North No.2 C63/C67913142352323363039312124222528404328NA1Dallas North No.2 C63/C679
Rockwall Heath C6913142362524373140302127242731384027NA1Rockwall Heath C69
Grapevine Fairway C70/A301/X1821323833202439333730202322NV25413829NA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07113442362423373340311926242733394226NA1Kaufman C71/A304/X071
Granbury C73/C68113538311826363537331923252430404133NA1Granbury C73/C681
Eagle Mountain Lake C75 14142351928413637352227242926424438NA1Eagle Mountain Lake C75
Parker County C7614041352029383641342129272728424438NA1Parker County C76
Cleburne Airport C77/C68214042352228393740352021262632414334NA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3293830192335293529202320NV26393824NA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40213443382525393039312020192932444029NA1Dallas Executive Airport C402
Greenville C1006/A19813741382524373339322028262831374127NA1Greenville C1006/A198
Pilot Point C103213843352025393240332427243430444440NA1Pilot Point C1032
Italy C1044/A3231364135242237343730172421NV30384131NA1Italy C1044/A323
Corsicana Airport C10511404335272037333934NANV222733404226NA1Corsicana Airport C1051
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
Longview C19/A127/C64424043403121314139352025243133333424NA2Longview C19/A127/C644
Tyler Airport Relocated C8214146423223374042372026243135373930NA1Tyler Airport Relocated C82
Karnack C85/AFHP30313847383219273941382229253336333427NA1Karnack C85/AFHP303
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G12523934363732353436353123303934404138NA2El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591NANANANANANANANANANV22283831373933NA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 14130393831373739413324353833484945NA1Chamizal C41/AH126
Socorro Hueco C49/F31213937363735353538383524304336424336NA1Socorro Hueco C49/F312
Skyline Park C7213636424136393636403526374141464646NA1Skyline Park C72
Ivanhoe C414/F514137373839323836393934243642364444NVNA1Ivanhoe C414/F514
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
Waco Mazanec C103714045362625394141311623202634384233NA1Waco Mazanec C1037
Temple Georgia C1045139453623NV404041311618202831383732NA1Temple Georgia C1045
Killeen Skylark Field C104713943342327393941331717242732383833NA1Killeen Skylark Field C1047
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2395044362333424440246162932383421NA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A141236484336NV28414539NV8142930363223NA2West Orange C9/A141
Port Arthur West C28/A128/A228139484235233342463825NVNANV31343419NA1Port Arthur West C28/A128/A228
Hamshire C64/C6541404944362133434639265143133393924NA1Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C16541394842362634424440298183133404529NA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N4358494230364951453112203536423728NA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431425146392835445041307173232424330NA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1384944362428424439266153031393324NA1Nederland High School C1035
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
Austin Northwest C3/A32223946362527384040311614202830373630NA2Austin Northwest C3/A322
Audubon C3813845332526373839271313172829343129NA1Audubon C38
St. Edwards University C16051 N3540312423333534251311162527323221NA1St. Edwards University C1605
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
Houston East C1/G316236484035123143433219442329293321NA2Houston East C1/G316
Houston Aldine C8/AF108/X150 238493832173643443318583134333418NA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 3394637331434394223146133029293518NA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542385040361936454635NV7123334373823NA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391384742361334424733213112831354222NA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451364438331133414126204122735314318NA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1414842381838444638225103431364721NA1Houston Bayland Park C53/A146
Conroe Relocated C78/A3211NANANVNV1836454333211014NANV353621NA1Conroe Relocated C78/A321
Manvel Croix Park C84141474035163543433720382934344521NA1Manvel Croix Park C84
Clinton C403/C304/AH113 333413530122929433316532931323517NA3Clinton C403/C304/AH113
Houston North Wayside C405129383225122932383012NV72728273014NA1Houston North Wayside C405
Houston Monroe C40613643NV32153239403519272328323921NA1Houston Monroe C406
Lang C408237463732163642423418372628293818NA2Lang C408
Houston Croquet C409236443834153340413519372830314320NA2Houston Croquet C409
Houston Westhollow C410139463935173542453521593232344221NA1Houston Westhollow C410
Park Place C4161NANANV33133338423518252631323820NA1Park Place C416
Sheldon C5511 N404737301637414228168113334313418NA1Sheldon C551
Baytown Wetlands Center C5521 N394634291232404734187143233354421NA1Baytown Wetlands Center C552
Crosby Library C5531 N354334271334373931133926282932NVNA1Crosby Library C553
West Houston C5541 N16313023882037278121217262611NA1West Houston C554
La Porte Sylvan Beach C5561 N374739321334414230166152935325121NA1La Porte Sylvan Beach C556
Mercer Arboretum C5571 N36453530153442412816583032333015NA1Mercer Arboretum C557
Tom Bass C5581 N37463936163441433620282732324622NA1Tom Bass C558
Katy Park C5591 N384738322036424533196103032363819NA1Katy Park C559
Atascocita C5601 N364437301634404230168102931323217NA1Atascocita C560
Meyer Park C5611 N415041361938464535218103335353421NA1Meyer Park C561
Bunker Hill Village C5621 N36453732153440423218483131323818NA1Bunker Hill Village C562
Huffman Wolf Road C5631 N4149423617384445372110133334343822NA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N37453531133238402617562733313317NA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N404840341637444839229153435364321NA1Wallisville Road C617
Danciger C618 1 N131844412140474840NVNANANANANANANANA1Danciger C618
Texas City 34th St. C620 1 N4452464017NV484641239203642415726NA1Texas City 34th St. C620
UH Moody Tower C6951 N4048423715364244372139NVNVNVNVNVNA1UH Moody Tower C695
UH WG Jones Forest C6981 N445041371839484433219173433363622NA1UH WG Jones Forest C698
UH West Liberty C6991 N394538311535414234187123131313519NA1UH West Liberty C699
Lynchburg Ferry C1015/A165 130434035NVNV394323205122630323320NA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 1424844391938464440236103339444825NA1Lake Jackson C1016
Baytown Garth C10171364538331534404637238143133354121NA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X18314448443824384345382612173238384932NA1Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N404440351636424437NV13143037404925NA1Oyster Creek C1607
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
San Antonio
San Antonio Northwest C2323946343527374037311717253532373428NA2San Antonio Northwest C23
Camp Bullis C58 14348312328404230201515223532343020NA1Camp Bullis C58
Calaveras Lake C5914046384027374643331815NVNANANANANANA1Calaveras Lake C59
New Braunfels Airport C5041 NNANANANANANANANANANANANANANANV3525NA1New Braunfels Airport C504
Heritage Middle School C6221 N38423127213137342612111517111398NA1Heritage Middle School C622
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C4241473832213641403720563436362820NA2Corpus Christi West C4
Corpus Christi Tuloso C21140433630203538383418NV9NVNV413223NA1Corpus Christi Tuloso C21
Victoria C871414741372234454036NV8113533423321NA1Victoria C87
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP14313737322420343336302114104135362724NA1Mission C43/AP143
Harlingen Teege C10231364036322335353631191793434372522NA1Harlingen Teege C1023
AreaMonitoring SitePOCFebruary 2020POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P24413641292226354038333411223836323831NA1Laredo 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.