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Peak Daily One-Hour Ozone Averages for March 2019

The table below lists the peak daily one-hour ozone concentrations measured in March 2019 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 SitePOCMarch 2019POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 218203639444639484734322349NANANANANA2Ft. Worth Northwest C13/AH302
Keller C1722222374144503851453737284845474854602Keller C17
Frisco C31/C68012620394248514551493942305246475154621Frisco C31/C680
Midlothian OFW C52/A13712219393946NANA42493836275347485155571Midlothian OFW C52/A137
Denton Airport South C56/A163/X15712522374245494159473937235146494959641Denton Airport South C56/A163/X157
Arlington Municipal Airport C6112124394145524437473636284943474854551Arlington Municipal Airport C61
Dallas North No.2 C63/C67912423394147524745513840325148474956601Dallas North No.2 C63/C679
Rockwall Heath C6912620404148504240513640304946474854621Rockwall Heath C69
Grapevine Fairway C70/A301/X18212523404247494254473739305148495058601Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07112522404149524339533840265451475054581Kaufman C71/A304/X071
Granbury C73/C68112121404048524039483435285248505359621Granbury C73/C681
Eagle Mountain Lake C75 12224404547524257493837245249515158671Eagle Mountain Lake C75
Parker County C7612723404547504350484137245548495259641Parker County C76
Cleburne Airport C77/C68212422404149544540493737295347515561621Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 32525414249504742534040324851495258593Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C40212221404348535045523839274847485256581Dallas Executive Airport C402
Greenville C1006/A19812621394148514046493542315146464754601Greenville C1006/A198
Pilot Point C103212823404350504558504139265448495057651Pilot Point C1032
Italy C1044/A32312820404046555040514136214951515456581Italy C1044/A323
Corsicana Airport C105112517394145524335525236255350484954551Corsicana Airport C1051
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
Longview C19/A127/C64421913333846484532554641344749464853632Longview C19/A127/C644
Tyler Airport Relocated C8212517374249554835565044295854495362651Tyler Airport Relocated C82
Karnack C85/AFHP30311916303944484032534140304745444750541Karnack C85/AFHP303
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G12524848444843594346545537545553484450472El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591404039444046354050463447505649NANANA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 14646433838503743524930525359454254471Chamizal C41/AH126
Socorro Hueco C49/F31214443454441493941505237454856504548511Socorro Hueco C49/F312
Skyline Park C7214646435054564747545139585460534351521Skyline Park C72
Ivanhoe C414/F5141454440424253394052503448NA57504447481Ivanhoe C414/F514
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
Waco Mazanec C103712517373744534938493732275346485155541Waco Mazanec C1037
Temple Georgia C104512114373747535136553527255344505260561Temple Georgia C1045
Killeen Skylark Field C1047122153841505752NANANANA235851535764591Killeen Skylark Field C1047
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 21724243543494335303032282547434449552Beaumont-Downtown C2/A112/C2002
West Orange C9/A14121919273443514338332723323245444348542West Orange C9/A141
Port Arthur West C28/A128/A22812624263643504437332621322748434347561Port Arthur West C28/A128/A228
Hamshire C64/C65412531283548514240362726372952494854571Hamshire C64/C654
SETRPC Port Arthur C6281 N2521263544514240352624262849464548551SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C165412719253443534740363528393153NA4254521SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N2125293846534338363725323251474750581SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C64312628283948534941372927363150474751561SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 12122263643484335322523302647444246521Nederland High School C1035
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
Austin Northwest C3/A32221410343846534435543729255250465359552Austin Northwest C3/A322
Audubon C381169333945534639554228265650465459551Audubon C38
Dripping Springs School C6141 N1610333941514237502725245450464955511Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N2112353946534940543626265450475361581CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N179333742504233503425265349455055531Gorzycki Middle School C1603
Lockhart C16041 N104212426282215251311132230302728271Lockhart C1604
St. Edwards University C16051 NNANANANANANANANANANANA234849454952531St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N158323842523930482521264950485456561CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N1812353745494232523224244850475356541CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
Houston East C1/G3162152715NA37453626292731342151424449512Houston East C1/G316
Houston Aldine C8/AF108/X150 21330233344523631303436282452484954592Houston Aldine C8/AF108/X150
Channelview C15/AH115 31127223141463033332422292350454549533Channelview C15/AH115
Northwest Harris Co. C26/A110/X15421329273646553831304728253252475153592Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23911732212941484435332924292250424350511Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4511932212838503932303023322246394249481Seabrook Friendship Park C45
Houston Bayland Park C53/A146 11531243441523733292931262350444551501Houston Bayland Park C53/A146
Conroe Relocated C78/A32111518293747604531323922274754495553571Conroe Relocated C78/A321
Manvel Croix Park C8412127213040503632322630282252454356501Manvel Croix Park C84
Clinton C403/C304/AH113 3NANANA2943423631272825251846434248433Clinton C403/C304/AH113
Houston North Wayside C40511124222936442924252826231942424148511Houston North Wayside C405
Houston Monroe C40612123172533403428252222232040383344421Houston Monroe C406
Lang C4082631213138403631293031242346444851502Lang C408
Houston Croquet C40921828212040493831292730262247414048482Houston Croquet C409
Houston Westhollow C4101831233242503931303134262349464954501Houston Westhollow C410
Park Place C41612228192636453331272626252145404048461Park Place C416
Baytown Wetlands Center C5521 N1019172836453722221416181342403942501Baytown Wetlands Center C552
Crosby Library C5531 N1320192837443525272224221944393945481Crosby Library C553
Katy Park C5591 N1038273443534029293033243048444952521Katy Park C559
Atascocita C5601 N720162531393123212119191639353541441Atascocita C560
Meyer Park C5611 NNANANANANANANANANANANANANA45434647541Meyer Park C561
Huffman Wolf Road C5631 N813141925312219191613161431272530341Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N1229233242483434312630282047454550531HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N1931253545524132342525312753484651561Wallisville Road C617
Danciger C618 1 N2826233246513834332531242451454462521Danciger C618
Texas City 34th St. C620 1 N2233263546575039353226352356494457561Texas City 34th St. C620
UH Moody Tower C6951 N2033223143513935333033272451474853511UH Moody Tower C695
UH WG Jones Forest C6981 N1522283745534231313920274353485353571UH WG Jones Forest C698
UH West Liberty C6991 N1325233443503834342521252248474454571UH West Liberty C699
Lynchburg Ferry C1015/A165 1629192939463533332320312444384247531Lynchburg Ferry C1015/A165
Lake Jackson C1016 12231213044524534332726292352434055521Lake Jackson C1016
Baytown Garth C101711931243445544133332526312651484550571Baytown Garth C1017
Galveston 99th St. C1034/A320/X18312033243445545038372522332446464254541Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N2442233144574939353029362656464359551Oyster Creek C1607
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
San Antonio
San Antonio Northwest C2321815323741554432482919295352444755552San Antonio Northwest C23
Camp Bullis C58 11816313942544535512922295552444955541Camp Bullis C58
Calaveras Lake C5911813333846524031463022314755494851591Calaveras Lake C59
Elm Creek Elementary C5011 N811313541514230442614284651444454561Elm Creek Elementary C501
Fair Oaks Ranch C5021 N1310313537514232462619265549414753531Fair Oaks Ranch C502
Bulverde Elementary C5031 N1813303639484230462422275349424752521Bulverde Elementary C503
New Braunfels Airport C5041 N128273438493626432118234546414348491New Braunfels Airport C504
City of Garden Ridge C5051 N1711323741513830463617264950444651531City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N135293139513829422316254247424349511Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N149273441473725432517273748424147521Heritage Middle School C622
CPS Pecan Valley C6781 N64182229362414281171427322930NANA1CPS Pecan Valley C678
Government Canyon C16101 N1111283437494130442718275349414452521Government Canyon C1610
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C421412NA3047564232322523262553464153562Corpus Christi West C4
Corpus Christi Tuloso C21113212529414836283221NA212548413447491Corpus Christi Tuloso C21
Victoria C87111212732445238313322252827534638NA561Victoria C87
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP14313326292642383425442624243643453345451Mission C43/AP143
Harlingen Teege C102313229322954444530343226312852504551551Harlingen Teege C1023
AreaMonitoring SitePOCMarch 2019POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P24411533203345464134423030294553454447531Laredo 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.