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Daily Maximum Eight-Hour Ozone Averages for March 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in March 2019 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 SitePOCMarch 2019POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2171733364245353944323031NVNANANANANANANANANA2Ft. Worth Northwest C13/AH302
Keller C172202036384247354143353430444244465153554851612Keller C17
Frisco C31/C6801231838394448424246373831494545485259585151651Frisco C31/C680
Midlothian OFW C52/A13711916383642NANANV46343531494545475154575248621Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571211936394246374545373531484446465458585152621Denton Airport South C56/A163/X157
Arlington Municipal Airport C611171838384248413544323330474143444852555053601Arlington Municipal Airport C61
Dallas North No.2 C63/C6791201737384348434047353831484645475357595256651Dallas North No.2 C63/C679
Rockwall Heath C69123163839444837344634382747444547515854NV53621Rockwall Heath C69
Grapevine Fairway C70/A301/X1821232038404445384045353531464646475254565253571Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711231738394549393550353930514745475156585157631Kaufman C71/A304/X071
Granbury C73/C6811191736384548383446333334474446485458595253611Granbury C73/C681
Eagle Mountain Lake C75 1202036414650404547363533494748485559615555651Eagle Mountain Lake C75
Parker County C761212139414447404246383537504547505661595552611Parker County C76
Cleburne Airport C77/C6821221837384551403647343534494648515560615456641Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3211940394647423849363929454847505254575357613Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021181739394450453848353830454646485255575258641Dallas Executive Airport C402
Greenville C1006/A1981241537394548383946363827484444454956585153601Greenville C1006/A198
Pilot Point C10321262039414746414547393830514647475459595453651Pilot Point C1032
Italy C1044/A3231241738384352423448363526474747505356595258651Italy C1044/A323
Corsicana Airport C1051124153839445039NV48433429504746475253565258621Corsicana Airport C1051
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C6442171734364345412946403930444745465159535555642Longview C19/A127/C644
Tyler Airport Relocated C821221638394752433454444127525148515762595661651Tyler Airport Relocated C82
Karnack C85/AFHP3031181832384144382943383828414442444851555353501Karnack C85/AFHP303
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
12345678910111213141516171819202122
El Paso-Juarez
El Paso UTEP C12/A125/X151/G125243454041414635454951324953NV45424646544544472El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X159135383538373727394542294449NVNVNANANANV4440441Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1404440313638314249442447515642404844594642511Chamizal C41/AH126
Socorro Hueco C49/F3121404139403942303946453140465348434648534845481Socorro Hueco C49/F312
Skyline Park C721454541434746454551483452525750404850594848521Skyline Park C72
Ivanhoe C414/F51414042383840423141494528NVNANV48394547554744501Ivanhoe C414/F514
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
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Waco
Waco Mazanec C10371221534334049423346343129454444475252585254631Waco Mazanec C1037
Temple Georgia C1045116133436434943304732262646NVNV495553584857631Temple Georgia C1045
Killeen Skylark Field C1047116133639465345NANANANANV534949545956625263671Killeen Skylark Field C1047
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
12345678910111213141516171819202122
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2111621324045353227232226204541424650576357702Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412111624334048403632242031234242414349576458682West Orange C9/A141
Port Arthur West C28/A128/A2281181924344147393531221829194441404251546659651Port Arthur West C28/A128/A228
Hamshire C64/C6541212225344546403633242434235046444852576458661Hamshire C64/C654
SETRPC Port Arthur C6281 N201724344248393632232025204643434450556664681SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C165411915223341494437342725352350NANV4647546263681SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N141627364350423634292331254844444652616158671SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431202126374551433935262332224843434752596865741SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1141723344146393330221927204440404249546056651Nederland High School C1035
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
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Austin
Austin Northwest C3/A322211833364249383046292324454844505552545162622Austin Northwest C3/A322
Audubon C381127333742NV433246312123484844515552565158621Audubon C38
Dripping Springs School C6141 N11733364047373044242121474844465148514753571Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N151034374349433448332324494845515753575161631CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N11832353946382946242123454743475249514956591Gorzycki Middle School C1603
Lockhart C16041 N6321222527181322101011192927252525282731321Lockhart C1604
St. Edwards University C16051 NNANANANANANANANANANANANV414843474948505060591St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N106323540493628412219234349NV505353565963651CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N131034364247372844292121444745505350555262601CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G3162921NVNANV40262223202329193933364543NANV60642Houston East C1/G316
Houston Aldine C8/AF108/X150 282224334147312628282524204945455053567164712Houston Aldine C8/AF108/X150
Channelview C15/AH115 382121313944292728201826174842404544506564643Channelview C15/AH115
Northwest Harris Co. C26/A110/X154281927354347352725371923245046474954586261722Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391112419293846333029211927204740404547557366641Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451152317273546312927211529204236394445536164611Seabrook Friendship Park C45
Houston Bayland Park C53/A146 192625343948332725262525214742404745576061601Houston Bayland Park C53/A146
Conroe Relocated C78/A3211121429364554362928352025385147495053626461781Conroe Relocated C78/A321
Manvel Croix Park C841152321313847332927222526215040404948587166601Manvel Croix Park C84
Clinton C403/C304/AH113 3NANANANV4039292524212022154240384539527757543Clinton C403/C304/AH113
Houston North Wayside C405171922293440222221231821153937384345445753551Houston North Wayside C405
Houston Monroe C406110201725303825232219NV22173731313740486151461Houston Monroe C406
Lang C4082318223034NV302625252322204337444746536161642Lang C408
Houston Croquet C4092112219NANV46322725242424204438364444556659562Houston Croquet C409
Houston Westhollow C410152423314047322724272624224744445045606463611Houston Westhollow C410
Park Place C41611122192633422825232321231942363544NV53NV61441Park Place C416
Baytown Wetlands Center C5521 N5141527344126151812131794036354042475058531Baytown Wetlands Center C552
Crosby Library C5531 N81719273541242123191621144137364145495452591Crosby Library C553
Katy Park C5591 N72426324148322624262323214642444947585858591Katy Park C559
Atascocita C5601 N41517243037201818171317133733333639434847581Atascocita C560
Meyer Park C5611 NNANANANANANANANANANANANANANV41434449525756661Meyer Park C561
Huffman Wolf Road C5631 N61114192428181617141115122926242730333535411Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N72123323944302727222125184539404745477264641HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N152524344349362930232129215045424851556764651Wallisville Road C617
Danciger C618 1 N19222433434936322723NV2322NV42405350616364641Danciger C618
Texas City 34th St. C620 1 N182423334353433733252333205246415253606871681Texas City 34th St. C620
UH Moody Tower C6951 N82622314047353029262625224943435045587766651UH Moody Tower C695
UH WG Jones Forest C6981 N1116283643493328293518NVNVNV46495052626462771UH WG Jones Forest C698
UH West Liberty C6991 N102023334248322930221824194544424951585756661UH West Liberty C699
Lynchburg Ferry C1015/A165 142119293345322929181429183935384246NV5958621Lynchburg Ferry C1015/A165
Lake Jackson C1016 1182420304149353231232326224940365149596362611Lake Jackson C1016
Baytown Garth C10171142623334350372830232129204945424752566662651Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831162321334352433632201831224444404951586662781Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N202821314254393532262533245143405453636966721Oyster Creek C1607
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
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San Antonio
San Antonio Northwest C232121032363947382940241725485142455152535960532San Antonio Northwest C23
Camp Bullis C58 1121232374148403241242025505143465151535958591Camp Bullis C58
Calaveras Lake C591141033374349372842261927435346464954535557611Calaveras Lake C59
Elm Creek Elementary C5011 N6730343946362737211224435041424849495359571Elm Creek Elementary C501
Fair Oaks Ranch C5021 N9729333644372839221622494840444949515255571Fair Oaks Ranch C502
Bulverde Elementary C5031 N10830343844362640211922484841454949505048561Bulverde Elementary C503
New Braunfels Airport C5041 N8528313645322335171419394539404346485355561New Braunfels Airport C504
City of Garden Ridge C5051 N9731353945332542201621424942444750515754581City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N8328293647352533191421384638404549515357621Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N9628323843322237201422354639404347485051551Heritage Middle School C622
CPS Pecan Valley C6781 N01192226322112208410253128NVNANANANANANA1CPS Pecan Valley C678
Government Canyon C16101 N7827323643362736221523464740424848505355541Government Canyon C1610
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C4211NVNANV4351373026232123NV5044354553525464672Corpus Christi West C4
Corpus Christi Tuloso C21110142527384232252619NANV224639314346444958581Corpus Christi Tuloso C21
Victoria C87181729314146322828202124255144NVNANV525856661Victoria C87
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
12345678910111213141516171819202122
Lower Rio Grande Valley
Mission C43/AP1431252321254035282337242222274340314337313951451Mission C43/AP143
Harlingen Teege C10231242624274742392731292427284945414752425063581Harlingen Teege C1023
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
12345678910111213141516171819202122
Laredo
Laredo Vidaurri C44/AFGP144/P2441112425304142383139282525385142414351454046461Laredo 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.