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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
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2432146485336374255596650545456656055555440502Ft. Worth Northwest C13/AH302
Keller C172452448515637404554626750515354666155555741502Keller C17
Midlothian OFW C52/A1371492446525338414558656249545760676060625439531Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571NA846495437384647536350495250656054535537491Denton Airport South C56/A163/X157
Arlington Municipal Airport C611452345495439404454626350545355656156555441501Arlington Municipal Airport C61
Dallas North No.2 C63/C6791482448505042394550566553525454696157585943521Dallas North No.2 C63/C679
Rockwall Heath C691452446554735394751596053445353615457606345501Rockwall Heath C69
Grapevine Fairway C70/A301/X1821442446495139404452606450515352676355565638511Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711462344494537384446536356415456615863565544541Kaufman C71/A304/X071
Granbury C73/C6811412149525939392957586750615557646155565441511Granbury C73/C681
Eagle Mountain Lake C75 1452551535940414653597153555556686457556042521Eagle Mountain Lake C75
Parker County C761402548505541423551516350635353625759535441521Parker County C76
Cleburne Airport C77/C6821472048535837393564626951585558696357595542501Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3NA948514941414452586351515556666058615641523Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021472346515141404452606353555558676059NA5641531Dallas Executive Airport C402
Greenville C1006/A1981422244484738384447496255424953615759564846501Greenville C1006/A198
Pilot Point C10321432448495140384850546754495252706455565340521Pilot Point C1032
Italy C1044/A3231452144525540384150626252505659585664585239531Italy C1044/A323
Corsicana Airport C10511492343525244384048546458495661605965565243581Corsicana Airport C1051
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C6442463939503931334243495856475055647165555443462Longview C19/A127/C644
Tyler Airport Relocated C821474042514941364949516070465456637065595847541Tyler Airport Relocated C82
Karnack C85/AFHP3031473531443736354641475457414552646560554747401Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
El Paso-Juarez
El Paso UTEP C12/A125/X1512535053565556444958755351645263595772586561602El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X1591494450535154434852625246585358555265536260531Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1565558575961475358745854675767646169566866591Chamizal C41/AH126
Socorro Hueco C49/F3121514850525354454352585148575255605762526161501Socorro Hueco C49/F312
Skyline Park C721535258586059515155735959675567646073576861591Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N565046454957574562455363625961646764625272593BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C4141535256535759465055645652635561625865566662541Ivanhoe C414
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Waco
Waco Mazanec C10371461942505540352741606251NANANA585563545038481Waco Mazanec C1037
Temple Georgia C10451491843505342372944617046465655635967555239501Temple Georgia C1045
Killeen Skylark Field C10471531947526145373943597854595857696665605743521Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2463532495244273426505549344356735458565056432Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412543436475446343627495855404853745749525359512West Orange C9/A141
Port Arthur West C28/A128/A2281463134475244293230485553334556625547545156471Port Arthur West C28/A128/A228
Hamshire C64/C6541463230505042303329495553364858635853575056421Hamshire C64/C654
SETRPC Port Arthur C6281 NNANANANANANANANANANANANANANANANANANA565055441SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541523932505343373231515756364558655749615456461SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 NNANANANANANANANANANANANANANANANANANA575962541SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431493535485346303329535755375058665750555260511SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1493334495145273529566058384856696055585161451Nederland High School C1035
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Austin
Austin Northwest C3/A3222483445525142343840567047425254605769555446502Austin Northwest C3/A322
Audubon C3814836455250433440375471484450526058665644-1-11Audubon C38
Fayette County C6012 N453334485027303739536244465254575265565236472Fayette County C601
Dripping Springs School C6141 N483645535144344841576847596154615869585544521Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N382738443728283233416037364248474760434434411CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N512647545444344142577251455454646166585443501CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N45334350494031383756704530873031332826251Gorzycki Middle School C1603
Lockhart C16041 N422941484833284238536242424759545476585245571Lockhart C1604
St. Edwards University C16051 N433142494633313537546443465254575368525042471St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N473343514935314636567045424856605675565344481CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N452944514739343345586745515456595671555140511CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G3162463037414735242922466056325058665857524746472Houston East C1/G316
Houston Aldine C8/AF108/X150 2513435464838253127576460375361716059605447532Houston Aldine C8/AF108/X150
Channelview C15/AH115 3452941414633262828495152295059555757574548503Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542473234494831272619486254435056645447605548512Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391452934455140262923515754344958635954585052501Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451452928454740222923475347304654565047555051491Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1452833485233242929565655355259675349655149501Houston Bayland Park C53/A146
Conroe Relocated C78/A3211574340475439263432488167434657756547654852381Conroe Relocated C78/A321
Manvel Croix Park C841472935555437272924615658355663675948675050511Manvel Croix Park C84
Clinton C403/C304/AH113 3432538444736242524515147304856545143584646473Clinton C403/C304/AH113
Houston North Wayside C4051412631364032242625455047294453605050564440451Houston North Wayside C405
Houston Monroe C4061412730424837222524464749324857545549534651481Houston Monroe C406
Lang C4082452929444435232627505755345258685251614442482Lang C408
Houston Croquet C4092432731444733222622515050334852584948584643462Houston Croquet C409
Houston Westhollow C4101442932495132253228535652335156635450645148481Houston Westhollow C410
Park Place C4161442835444939222820505251344856595552604752491Park Place C416
Baytown Wetlands Center C5521 N392129353721192218384540194046504243474340371Baytown Wetlands Center C552
Crosby Library C5531 N503238455042273224506155325360676161595147481Crosby Library C553
La Porte Sylvan Beach C5561 N312125323525142114333940203641513934341616221La Porte Sylvan Beach C556
Tom Bass C5581 N36252523442615206305048264144554838234241351Tom Bass C558
Katy Park C5591 N372123434322202723434644304448494538594430431Katy Park C559
Atascocita C5601 N452927424428232523456453284957705449585140471Atascocita C560
Meyer Park C5611 N322322343621172022354641243638463931423630311Meyer Park C561
Bunker Hill Village C5621 N352325394020202524444643244448554340544036421Bunker Hill Village C562
Huffman Wolf Road C5631 N292119242720151714283431182832423630343326271Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N412834434630252723475448254857635552584747481HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N503242465246293027536055355262665968605153501Wallisville Road C617
Texas City 34th St. C620 1 N493136535343283029535754345161605550595455591Texas City 34th St. C620
UH Moody Tower C6951 N452831475039252924535755345259625554634953501UH Moody Tower C695
UH WG Jones Forest C6981 N534038505433273134497466405461726346635151571UH WG Jones Forest C698
UH West Liberty C6991 N483337434537262824476053314856695855555345471UH West Liberty C699
Lynchburg Ferry C1015/A165 1452731424640202724424954314655585955525048451Lynchburg Ferry C1015/A165
Lake Jackson C1016 1452928575536233026665555345157595850755555501Lake Jackson C1016
Baytown Garth C10171513542455246283127516256365160665968595153491Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831533630565545283430565960375464646254665660631Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N483028585737232730585653324956615949635554521Oyster Creek C1607
AreaMonitoring SitePOCApril 2018POCMonitoring Site
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San Antonio
San Antonio Northwest C232493844534836324638616546526057575866594746552San Antonio Northwest C23
Camp Bullis C58 1514045535037324839577049576159596067614948531Camp Bullis C58
Calaveras Lake C591503745534834345038586644454962585669565149571Calaveras Lake C59
Elm Creek Elementary C5011 N473643524735344536636144485158565760574745571Elm Creek Elementary C501
Fair Oaks Ranch C5021 N483844514735314438516548565953565860594544471Fair Oaks Ranch C502
Bulverde Elementary C5031 N493844524837324938566947566056585866594845491Bulverde Elementary C503
New Braunfels Airport C5041 N453343464633304934536743424865565373524542461New Braunfels Airport C504
City of Garden Ridge C5051 N503844515036344537596643536065575676574745521City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N463343494733295533506445424363595466544846451Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N483545494633314534556041464659565169534746551Heritage Middle School C622
CPS Pecan Valley C6781 N261925332716202621373720242732302941332828271CPS Pecan Valley C678
Government Canyon C16101 N473845544536324536596446546157575965624644551Government Canyon C1610
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
Corpus Christi-Victoria
Corpus Christi West C42442527484525283427625145284758484843635745522Corpus Christi West C4
Corpus Christi Tuloso C211392627454223293528595242284859544845605543541Corpus Christi Tuloso C21
Victoria C871412627584628274123475745314752494949524840491Victoria C87
Violet C6641 N3217195041172316NANANANANANANANA-9-9NANANANA1Violet C664
Ingleside C6851 N50272853NANANANANANANANANANANANANANANANANANA1Ingleside C685
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
Lower Rio Grande Valley
Mission C43/AP1431372835414727334239465139395463524950514531511Mission C43/AP143
Harlingen Teege C10231413032463526313832565640345161535248544735561Harlingen Teege C1023
AreaMonitoring SitePOCApril 2018POCMonitoring Site
12345678910111213141516171819202122
Laredo
Laredo Vidaurri C44/AFGP144/P2441423546424135364428515046465652545051555743601Laredo 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.