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Peak Daily One-Hour Ozone Averages for April 2018

The table below lists the peak daily one-hour ozone concentrations measured in April 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 SitePOCApril 2018POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 24321464853363742555966505454566560552Ft. Worth Northwest C13/AH302
Keller C1724524485156374045546267505153546661552Keller C17
Midlothian OFW C52/A13714924465253384145586562495457606760601Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571NA8464954373846475363504952506560541Denton Airport South C56/A163/X157
Arlington Municipal Airport C6114523454954394044546263505453556561561Arlington Municipal Airport C61
Dallas North No.2 C63/C67914824485050423945505665535254546961571Dallas North No.2 C63/C679
Rockwall Heath C6914524465547353947515960534453536154571Rockwall Heath C69
Grapevine Fairway C70/A301/X18214424464951394044526064505153526763551Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07114623444945373844465363564154566158631Kaufman C71/A304/X071
Granbury C73/C68114121495259393929575867506155576461551Granbury C73/C681
Eagle Mountain Lake C75 14525515359404146535971535555566864571Eagle Mountain Lake C75
Parker County C7614025485055414235515163506353536257591Parker County C76
Cleburne Airport C77/C68214720485358373935646269515855586963571Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3NA9485149414144525863515155566660583Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40214723465151414044526063535555586760591Dallas Executive Airport C402
Greenville C1006/A19814222444847383844474962554249536157591Greenville C1006/A198
Pilot Point C103214324484951403848505467544952527064551Pilot Point C1032
Italy C1044/A32314521445255403841506262525056595856641Italy C1044/A323
Corsicana Airport C105114923435252443840485464584956616059651Corsicana Airport C1051
AreaMonitoring SitePOCApril 2018POCMonitoring Site
Longview C19/A127/C64424639395039313342434958564750556471652Longview C19/A127/C644
Tyler Airport Relocated C8214740425149413649495160704654566370651Tyler Airport Relocated C82
Karnack C85/AFHP30314735314437363546414754574145526465601Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2018POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X15125350535655564449587553516452635957722El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X15914944505351544348526252465853585552651Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 15655585759614753587458546757676461691Chamizal C41/AH126
Socorro Hueco C49/F31215148505253544543525851485752556057621Socorro Hueco C49/F312
Skyline Park C7215352585860595151557359596755676460731Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N5650464549575745624553636259616467643BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C41415352565357594650556456526355616258651Ivanhoe C414
AreaMonitoring SitePOCApril 2018POCMonitoring Site
Waco Mazanec C10371461942505540352741606251NANANA5855631Waco Mazanec C1037
Temple Georgia C104514918435053423729446170464656556359671Temple Georgia C1045
Killeen Skylark Field C104715319475261453739435978545958576966651Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2018POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 24635324952442734265055493443567354582Beaumont-Downtown C2/A112/C2002
West Orange C9/A14125434364754463436274958554048537457492West Orange C9/A141
Port Arthur West C28/A128/A22814631344752442932304855533345566255471Port Arthur West C28/A128/A228
Hamshire C64/C65414632305050423033294955533648586358531Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C165415239325053433732315157563645586557491SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C64314935354853463033295357553750586657501SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 14933344951452735295660583848566960551Nederland High School C1035
AreaMonitoring SitePOCApril 2018POCMonitoring Site
Austin Northwest C3/A32224834455251423438405670474252546057692Austin Northwest C3/A322
Audubon C3814836455250433440375471484450526058661Audubon C38
Fayette County C6012 N4533344850273037395362444652545752652Fayette County C601
Dripping Springs School C6141 N4836455351443448415768475961546158691Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N3827384437282832334160373642484747601CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N5126475454443441425772514554546461661CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N45334350494031383756704530873031331Gorzycki Middle School C1603
Lockhart C16041 N4229414848332842385362424247595454761Lockhart C1604
St. Edwards University C16051 N4331424946333135375464434652545753681St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N4733435149353146365670454248566056751CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N4529445147393433455867455154565956711CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2018POCMonitoring Site
Houston East C1/G31624630374147352429224660563250586658572Houston East C1/G316
Houston Aldine C8/AF108/X150 25134354648382531275764603753617160592Houston Aldine C8/AF108/X150
Channelview C15/AH115 34529414146332628284951522950595557573Channelview C15/AH115
Northwest Harris Co. C26/A110/X15424732344948312726194862544350566454472Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23914529344551402629235157543449586359541Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4514529284547402229234753473046545650471Seabrook Friendship Park C45
Houston Bayland Park C53/A146 14528334852332429295656553552596753491Houston Bayland Park C53/A146
Conroe Relocated C78/A32115743404754392634324881674346577565471Conroe Relocated C78/A321
Manvel Croix Park C8414729355554372729246156583556636759481Manvel Croix Park C84
Clinton C403/C304/AH113 34325384447362425245151473048565451433Clinton C403/C304/AH113
Houston North Wayside C40514126313640322426254550472944536050501Houston North Wayside C405
Houston Monroe C40614127304248372225244647493248575455491Houston Monroe C406
Lang C40824529294444352326275057553452586852512Lang C408
Houston Croquet C40924327314447332226225150503348525849482Houston Croquet C409
Houston Westhollow C41014429324951322532285356523351566354501Houston Westhollow C410
Park Place C41614428354449392228205052513448565955521Park Place C416
Baytown Wetlands Center C5521 N3921293537211922183845401940465042431Baytown Wetlands Center C552
Crosby Library C5531 N5032384550422732245061553253606761611Crosby Library C553
La Porte Sylvan Beach C5561 N3121253235251421143339402036415139341La Porte Sylvan Beach C556
Tom Bass C5581 N362525234426152063050482641445548381Tom Bass C558
Katy Park C5591 N3721234343222027234346443044484945381Katy Park C559
Atascocita C5601 N4529274244282325234564532849577054491Atascocita C560
Meyer Park C5611 N3223223436211720223546412436384639311Meyer Park C561
Bunker Hill Village C5621 N3523253940202025244446432444485543401Bunker Hill Village C562
Huffman Wolf Road C5631 N2921192427201517142834311828324236301Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N4128344346302527234754482548576355521HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N5032424652462930275360553552626659681Wallisville Road C617
Texas City 34th St. C620 1 N4931365353432830295357543451616055501Texas City 34th St. C620
UH Moody Tower C6951 N4528314750392529245357553452596255541UH Moody Tower C695
UH WG Jones Forest C6981 N5340385054332731344974664054617263471UH WG Jones Forest C698
UH West Liberty C6991 N4833374345372628244760533148566958551UH West Liberty C699
Lynchburg Ferry C1015/A165 14527314246402027244249543146555859551Lynchburg Ferry C1015/A165
Lake Jackson C1016 14529285755362330266655553451575958501Lake Jackson C1016
Baytown Garth C101715135424552462831275162563651606659681Baytown Garth C1017
Galveston 99th St. C1034/A320/X18315336305655452834305659603754646462541Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N4830285857372327305856533249566159491Oyster Creek C1607
AreaMonitoring SitePOCApril 2018POCMonitoring Site
San Antonio
San Antonio Northwest C2324938445348363246386165465260575758662San Antonio Northwest C23
Camp Bullis C58 15140455350373248395770495761595960671Camp Bullis C58
Calaveras Lake C5915037455348343450385866444549625856691Calaveras Lake C59
Elm Creek Elementary C5011 N4736435247353445366361444851585657601Elm Creek Elementary C501
Fair Oaks Ranch C5021 N4838445147353144385165485659535658601Fair Oaks Ranch C502
Bulverde Elementary C5031 N4938445248373249385669475660565858661Bulverde Elementary C503
New Braunfels Airport C5041 N4533434646333049345367434248655653731New Braunfels Airport C504
City of Garden Ridge C5051 N5038445150363445375966435360655756761City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N4633434947332955335064454243635954661Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N4835454946333145345560414646595651691Heritage Middle School C622
CPS Pecan Valley C6781 N2619253327162026213737202427323029411CPS Pecan Valley C678
Government Canyon C16101 N4738455445363245365964465461575759651Government Canyon C1610
AreaMonitoring SitePOCApril 2018POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C424425274845252834276251452847584848432Corpus Christi West C4
Corpus Christi Tuloso C2113926274542232935285952422848595448451Corpus Christi Tuloso C21
Victoria C8714126275846282741234757453147524949491Victoria C87
Violet C6641 N3217195041172316NANANANANANANANA-9-91Violet C664
Ingleside C6851 N50272853NANANANANANANANANANANANANANA1Ingleside C685
AreaMonitoring SitePOCApril 2018POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP14313728354147273342394651393954635249501Mission C43/AP143
Harlingen Teege C102314130324635263138325656403451615352481Harlingen Teege C1023
AreaMonitoring SitePOCApril 2018POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P24414235464241353644285150464656525450511Laredo 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.