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Daily Maximum Eight-Hour Ozone Averages for April 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2018 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 SitePOCApril 2018POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2391841434934343747546047415253615552525036NVNA2Ft. Worth Northwest C13/AH302
Keller C172382043475237354249576047395151625551525237NVNA2Keller C17
Midlothian OFW C52/A137145234449493837404959584442555861NV58NV5136NVNA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571NANV41464936344245485947374948625550515136NVNA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C6114120424650373641485759474052536154NV525036NVNA1Arlington Municipal Airport C61
Dallas North No.2 C63/C6791422142474636344345526150405252645654545336NVNA1Dallas North No.2 C63/C679
Rockwall Heath C691392040514437364448555650365051595253575835NVNA1Rockwall Heath C69
Grapevine Fairway C70/A301/X1821382043464638364349545847395149615453535235NVNA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711432239474234354243505754375153575560545137NVNA1Kaufman C71/A304/X071
Granbury C73/C6811341944485236352747536046455355605650535139NVNA1Granbury C73/C681
Eagle Mountain Lake C75 1382245495537374049556449425454645754535539NVNA1Eagle Mountain Lake C75
Parker County C761332244465036393248505845555251585453515139NVNA1Parker County C76
Cleburne Airport C77/C6821432044495236353051586448415356655754555139NVNA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3NANV43484637364248555947405352615554575136NVNA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021432343474837364348555948405254625656NANV35NVNA1Dallas Executive Airport C402
Greenville C1006/A1981391938454336354343465753344750585355534636NVNA1Greenville C1006/A198
Pilot Point C10321382141464536354747506250394950645852545035NVNA1Pilot Point C1032
Italy C1044/A3231432041494837353644585847395356NV5361554935NVNA1Italy C1044/A323
Corsicana Airport C10511472438484736353743515954385257565661534936NVNA1Corsicana Airport C1051
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C6442443232473428323941455154NVNV51546457534936NVNA2Longview C19/A127/C644
Tyler Airport Relocated C8214434374844NV324445495665385154606160575438NVNA1Tyler Airport Relocated C82
Karnack C85/AFHP30314431NVNV3432344340434853354247555749534340NVNA1Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X1512484951505352374752644950595157575563516258NVNA2El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X159145NV4747484734454956454654495451505951NV56NVNA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1525355505756395154635453625459615964466562NVNA1Chamizal C41/AH126
Socorro Hueco C49/F3121464548475050384149524945555051575457505857NVNA1Socorro Hueco C49/F312
Skyline Park C721505156525757435152635655625261625965536457NVNA1Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N534945444855434257425155595358626361604769NVNA3BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C4141495054485555395051585350595256605660526357NVNA1Ivanhoe C414
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Waco
Waco Mazanec C10371442039474935322338565847NANANANV5261514735NVNA1Waco Mazanec C1037
Temple Georgia C10451472139464739332540556244425353605664534932NVNA1Temple Georgia C1045
Killeen Skylark Field C1047151254149534234323954NV49465456656163565336NVNA1Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2452625464835272826475248313754645148544655NVNA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412513130464937283229465251323849655547494857NVNA2West Orange C9/A141
Port Arthur West C28/A128/A2281442727444834263027465250314053585345514954NVNA1Port Arthur West C28/A128/A228
Hamshire C64/C6541442627464734283026475152323956605749554855NVNA1Hamshire C64/C654
SETRPC Port Arthur C6281 NNANANANANANANANANANANANANANANANANANA544851NVNA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541493128474937272936455453343855625448585153NVNA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 NNANANANANANANANANANANANANANANANANANA555159NVNA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431472929455036283127495453334355615548534958NVNA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1483132454735273227525556364053645851564958NVNA1Nederland High School C1035
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Austin
Austin Northwest C3/A3222452841484636313437526043435052575365525134NVNA2Austin Northwest C3/A322
Audubon C3814528414847383035365262444148505854635239NANVNA1Audubon C38
Fayette County C6012 N433036454726273133505841374952554951524932NVNA2Fayette County C601
Dripping Springs School C6141 N463242494638304137536344524753585565555335NVNA1Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N362435413625252630395135304145454454414128NVNA1CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N482542504939313639546146415253605663545234NVNA1CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N432940474435283435536042266623232324211NVNA1Gorzycki Middle School C1603
Lockhart C16041 N392639444329263235465540384554524967534836NVNA1Lockhart C1604
St. Edwards University C16051 N412639454229283135505439434650534964494632NVNA1St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N453037464532273831516141414553575363525038NVNA1CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N432340474434323041545742445154565366524934NVNA1CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G3162442629384329232418415253354155595548484441NVNA2Houston East C1/G316
Houston Aldine C8/AF108/X150 2493032444527242524505656424759625850584843NVNA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 3422430394328242226464549384457515449554342NVNA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X15424530324645252323NVNV5550424654585246574741NVNA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391432827434734242722475352374255585549554949NVNA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451422524424532212722445046334051534743524747NVNA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1432729454826232626525352424857595240624846NVNA1Houston Bayland Park C53/A146
Conroe Relocated C78/A3211553736455028252830456662433951666148614547NVNA1Conroe Relocated C78/A321
Manvel Croix Park C84144283150513025272154545442496161NV46614846NVNA1Manvel Croix Park C84
Clinton C403/C304/AH113 3412329424222232221484543344053504839554343NVNA3Clinton C403/C304/AH113
Houston North Wayside C4051392329353721222120404444293650534840534236NVNA1Houston North Wayside C405
Houston Monroe C4061392426384429202220404546354054505045494747NVNA1Houston Monroe C406
Lang C4082432728423925232222455151414556595145563938NVNA2Lang C408
Houston Croquet C4092412628424426212320464848384250524744544341NVNA2Houston Croquet C409
Houston Westhollow C4101422730464626232625505249454553565145604841NVNA1Houston Westhollow C410
Park Place C4161422627414529212517455049354053565346564748NVNA1Park Place C416
Baytown Wetlands Center C5521 N341720333513162016364137203542463737454138NVNA1Baytown Wetlands Center C552
Crosby Library C5531 N473130434830252823465653374559595750564844NVNA1Crosby Library C553
La Porte Sylvan Beach C5561 N271717283219121813293637213340423631271113NVNA1La Porte Sylvan Beach C556
Tom Bass C5581 N34222319392112144204545203239504636214037NVNA1Tom Bass C558
Katy Park C5591 N351924403917182116394341363946474436504027NVNA1Katy Park C559
Atascocita C5601 N422225404219202119425549304155615240544537NVNA1Atascocita C560
Meyer Park C5611 N312121323216171720333937253237413731403126NVNA1Meyer Park C561
Bunker Hill Village C5621 N332124373616202021414341293946484136513931NVNA1Bunker Hill Village C562
Huffman Wolf Road C5631 N271717232414141512263130202231353424322924NVNA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N392430404324242121444846364054565245544342NVNA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N472933454933272725505754444661625555594850NVNA1Wallisville Road C617
Texas City 34th St. C620 1 N452730484933272830495451384559575247565353NVNA1Texas City 34th St. C620
UH Moody Tower C6951 N442729444730242421495452404757585348604849NVNA1UH Moody Tower C695
UH WG Jones Forest C6981 N51353547502824NV33476260445259666047604646NVNA1UH WG Jones Forest C698
UH West Liberty C6991 N453028414127242523445652354254625446534742NVNA1UH West Liberty C699
Lynchburg Ferry C1015/A165 142242939NV31202520374751343852535545474744NVNA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 140272753493222272159NV51384455575447NV5350NVNA1Lake Jackson C1016
Baytown Garth C10171483132445034262825485754414459625555574950NVNA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831493128525238282929525857404962615851605757NVNA1Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N452726535132212525545452314254575547605351NVNA1Oyster Creek C1607
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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San Antonio
San Antonio Northwest C232463442494432304237566043504555555361554643NVNA2San Antonio Northwest C23
Camp Bullis C58 1483542504532314237536445514556575661584740NVNA1Camp Bullis C58
Calaveras Lake C591473241504331324036546143444556565359544938NVNA1Calaveras Lake C59
Elm Creek Elementary C5011 N443241484329313934565842434554545148544437NVNA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N453440484231293934496044494350545456554436NVNA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N463441494232294334526345494453565459554538NVNA1Bulverde Elementary C503
New Braunfels Airport C5041 N432937434129273931495840414255535058484436NVNA1New Braunfels Airport C504
City of Garden Ridge C5051 N463342484231314235546240504658565265544639NVNA1City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N443035444230263929465941324155555154494635NVNA1Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N433037464029293831515839414455524853504636NVNA1Heritage Middle School C622
CPS Pecan Valley C6781 N231625302314192320333019222629282729312720NVNA1CPS Pecan Valley C678
Government Canyon C16101 N443343514230304037546043494554555452574543NVNA1Government Canyon C1610
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C42372625454221253126534842384454NV4540595334NVNA2Corpus Christi West C4
Corpus Christi Tuloso C21135252542382126322452494038445450NV41575133NVNA1Corpus Christi Tuloso C21
Victoria C871382530514123253320455242394349484744504731NVNA1Victoria C87
Violet C6641 N25171844301420NVNANANANANANANANANANVNANANANANA1Violet C664
Ingleside C6851 N442724NVNANANANANANANANANANANANANANANANANANANA1Ingleside C685
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP1431352631393525313835414936NV5057514747484126NVNA1Mission C43/AP143
Harlingen Teege C10231382829403024293330455336364956525047504531NVNA1Harlingen Teege C1023
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P2441413240393533333827484843424649524844525038NVNA1Laredo 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.