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Peak Daily One-Hour Ozone Averages for April 2014

The table below lists the peak daily one-hour ozone concentrations measured in April 2014 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 SitePOCApril 2014POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2503040533638545264665951374757632Ft. Worth Northwest C13/AH302
Keller C172513138483536484666615947354555612Keller C17
Frisco C31/C6801443245453539464769645547374556591Frisco C31/C680
Midlothian OFW C52/A1371453134493739555167605446374757581Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571583341484038494968656452374960641Denton Airport South C56/A163/X157
Arlington Municipal Airport C611492933473339534868615346354556581Arlington Municipal Airport C61
Dallas North No.2 C63/C6791473041463941504871655447394555581Dallas North No.2 C63/C679
Rockwall Heath C691502745513841505166585446424661561Rockwall Heath C69
Grapevine Fairway C70/A301/X18215331405038395050676659513810158601Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711442829443636465059545145384252511Kaufman C71/A304/X071
Granbury C73/C6811543044534337525167605949404856641Granbury C73/C681
Eagle Mountain Lake C75 1483039483836504861605748344656NA1Eagle Mountain Lake C75
Parker County C761573250554738505471636049365260691Parker County C76
Cleburne Airport C77/C6821493038543742505273655950374857611Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3NANA38483841514970625347374652553Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021432731473536504767595144374757561Dallas Executive Airport C402
Greenville C1006/A1981472745453439465158535144384254501Greenville C1006/A198
Pilot Point C10321563342463737485068686453384958621Pilot Point C1032
Italy C1044/A3231422533483532484969594944364358591Italy C1044/A323
Corsicana Airport C10511412426453834444958524742364154521Corsicana Airport C1051
AreaMonitoring SitePOCApril 2014POCMonitoring Site
Longview C19/A127/C6442372736453538404956635244413953522Longview C19/A127/C644
Tyler Airport Relocated C821423235474035455361686054434152501Tyler Airport Relocated C82
Karnack C85/AFHP3031392445463640384764604846403152521Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2014POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X1512545358585955565552534944524651552El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X1591404753455349514947433737434644441Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1555457NANANA25556515043545248561Chamizal C41/AH126
Socorro Hueco C49/F3121494855505653526550534849485049531Socorro Hueco C49/F312
Skyline Park C721505255515650515446494744515050571Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N535554595761565455585651625554543BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C4141545058485954535855535145525047561Ivanhoe C414
Cd Juarez Delphi C6631 N404243434844425036373331404336NA1Cd Juarez Delphi C663
AreaMonitoring SitePOCApril 2014POCMonitoring Site
Waco Mazanec C10371412630514133475070565044384456611Waco Mazanec C1037
Temple Georgia C10451432933554434495375615549404657571Temple Georgia C1045
Killeen Skylark Field C10471483139554436515277626652424758621Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2014POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2NANANANANANANANANA604848373050522Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412393733444334425171584944313248522West Orange C9/A141
Port Arthur West C28/A128/A2281373133424234435057544945352847511Port Arthur West C28/A128/A228
Hamshire C64/C6541393438494633445262565047393148531Hamshire C64/C654
SETRPC Port Arthur C6281 N332934393828394452504241312443471SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C165412422222624122729NA455250403350541SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N373334414231404974584844362945501SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431363134414033434956544643322846481SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1413538454334455362585048363151541Nederland High School C1035
AreaMonitoring SitePOCApril 2014POCMonitoring Site
Austin Northwest C3/A3222402531524234505166545346394455602Austin Northwest C3/A322
Audubon C381412832514233475066555647374354601Audubon C38
Fayette County C6012 NNANANANANANANANANANANANA294360572Fayette County C601
AreaMonitoring SitePOCApril 2014POCMonitoring Site
Houston East C1/G3162362829444330514766554845353546532Houston East C1/G316
Houston Aldine C8/AF108/X150 2342428504134525472545046363449572Houston Aldine C8/AF108/X150
Channelview C15/AH115 3272326484130525457504241323651473Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542312326443831445160474437313343502Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391303029474632524958504241353448511Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451343333464732585158514646373448521Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1322728474532525165494243373750531Houston Bayland Park C53/A146
Conroe Relocated C78/A3211553634534137475071646560403650601Conroe Relocated C78/A321
Manvel Croix Park C841332930524733565563524445363650511Manvel Croix Park C84
Clinton C403/C304/AH113 3282618494426504857473740333149473Clinton C403/C304/AH113
Houston North Wayside C4051332426494233505064534845333449531Houston North Wayside C405
Houston Monroe C4061353130474732555465564744363248521Houston Monroe C406
Lang C4082332826464233515370504544353647522Lang C408
Houston Croquet C4092332930475232535364494343383549512Houston Croquet C409
Houston Westhollow C4101322727484632505259504342353549521Houston Westhollow C410
Houston Texas Avenue C4111292423464026454556453839333245501Houston Texas Avenue C411
Park Place C4161353024484834545165534644343246511Park Place C416
Sheldon C5511 N2724235040285051614942413017NANA1Sheldon C551
Baytown Wetlands Center C5521 N333228474732534857474946353348471Baytown Wetlands Center C552
Crosby Library C5531 N353129474231505271534747353348501Crosby Library C553
West Houston C5541 N352928504532535763534847363953601West Houston C554
La Porte Sylvan Beach C5561 N433534504835575461535049383651551La Porte Sylvan Beach C556
Mercer Arboretum C5571 N422627494031495069525047343347571Mercer Arboretum C557
Tom Bass C5581 N302527454527494858473940323244481Tom Bass C558
Katy Park C5591 N302428474128475159484440323448521Katy Park C559
Atascocita C5601 N373129473830465070534947333146531Atascocita C560
Meyer Park C5611 N352628473933475165534744343647551Meyer Park C561
Huffman Wolf Road C5631 N36292949373146507956494433NA47491Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N312227514832555360564543323753551HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N413635545034595971535051393856541Wallisville Road C617
Danciger C618 1 N282528594222545555504341323456511Danciger C618
Mustang Bayou C619 1 N413337574431615661544848353556521Mustang Bayou C619
Texas City 34th St. C620 1 N363231504432665359514745363652551Texas City 34th St. C620
UH Moody Tower C6951 N363133545330585773564948403652531UH Moody Tower C695
U of H-Sugarland C6961 N292628475234475159514342333550501U of H-Sugarland C696
UH Coastal Center C6971 N393836534531615358514750383551541UH Coastal Center C697
UH WG Jones Forest C6981 N523034524237515771635953383851631UH WG Jones Forest C698
UH West Liberty C6991 N463537564638555998635152404056581UH West Liberty C699
Lynchburg Ferry C1015/A165 1313128414031494953504342323342461Lynchburg Ferry C1015/A165
Lake Jackson C1016 1332931594330535565494443333754511Lake Jackson C1016
Baytown Garth C10171403434504732555569534949383551511Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831403634484232725458565350403650551Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCApril 2014POCMonitoring Site
San Antonio
San Antonio Northwest C232414039534236474654474844403649602San Antonio Northwest C23
Camp Bullis C581474240604335435270586151464460651Camp Bullis C58
Calaveras Lake C591393135553935525359555143394258581Calaveras Lake C59
Elm Creek Elementary C5011 N374235533733485158525244414058561Elm Creek Elementary C501
Fair Oaks Ranch C5021 N4639405441304750665559494338NANA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N443937574136465373585850444357611Bulverde Elementary C503
New Braunfels Airport C5041 N382933523933495260535346374056571New Braunfels Airport C504
City of Garden Ridge C5051 N342730513530424757494739333947521City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N372733513533514962555347383954571Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N403238594136575664585545343753631Heritage Middle School C622
CPS Pecan Valley C6781 N413536563833525264565146383752571CPS Pecan Valley C678
AreaMonitoring SitePOCApril 2014POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C42312725514131455452494840333553512Corpus Christi West C4
Corpus Christi Tuloso C211272524533927465451484440313553521Corpus Christi Tuloso C21
Victoria C871272624484027484652504442333952501Victoria C87
Inez C6091 NNANA24514731474951514444364249531Inez C609
Aransas Pass C6591 NNANA28584936475962574946284661621Aransas Pass C659
Holly Road C6601 N363129574835505660585347374459591Holly Road C660
Violet C6641 N282423544331545753494542333856541Violet C664
Odem C6861 N292525544333495657514742323859561Odem C686
Taft C6871 N353229544532495557535144364154541Taft C687
AreaMonitoring SitePOCApril 2014POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP1431283251514932664954444342343253511Mission C43/AP143
Brownsville C80/AGP1801262228525028455455514641293555541Brownsville C80/AGP180
Harlingen Teege C10231262427575730465454504743324165541Harlingen Teege C1023
AreaMonitoring SitePOCApril 2014POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P2441374351524153535556494944443854551Laredo 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 - 0.059
51 - 100 Not Defined 0.06 - 0.075
101 - 150 0.125 - 0.164 0.076 - 0.095
151 - 200 0.165 - 0.204 0.096 - 0.115
201 - 300 0.205 - 0.404 0.116 - 0.374
301 - 400 0.405 - 0.504 Not Defined
401 - 500 0.505 - 0.604 Not Defined
500+ Not Defined Not Defined

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 beginning 1/1/2013, 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.