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Peak Daily One-Hour Ozone Averages for March 2017

The table below lists the peak daily one-hour ozone concentrations measured in March 2017 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 2017POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 25145534429335048303136363740453939464447443147512Ft. Worth Northwest C13/AH302
Keller C1725150574836345151303342393745514242504848505151512Keller C17
Frisco C31/C68014951554538364952333341393743434138524949564150501Frisco C31/C680
Midlothian OFW C52/A13715252554735365247383535414147504343464953535149521Midlothian OFW C52/A137
Denton Airport South C56/A163/X15715154574635375155333543393736454241624751525552531Denton Airport South C56/A163/X157
Arlington Municipal Airport C6114645504232314544322932353641453536394245454246451Arlington Municipal Airport C61
Dallas North No.2 C63/C67914852554435314750323240413741454340514649524350511Dallas North No.2 C63/C679
Rockwall Heath C6914951544632314850323443383744444237403753434149451Rockwall Heath C69
Grapevine Fairway C70/A301/X18214851534532354948313341373638443939564648505049501Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X07114949544535344749323448384043484640404049464152441Kaufman C71/A304/X071
Granbury C73/C68115050544534365446283337353945544143434648464754561Granbury C73/C681
Eagle Mountain Lake C75 15043574832375152343341404047514244544452485054551Eagle Mountain Lake C75
Parker County C7614746534633335046323138333645544137444548454552541Parker County C76
Cleburne Airport C77/C6821565661513538555134343841434958444748545544NANA571Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 34852544329345049313542383841454040494651524451493Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402145465040282946443032343536424339374241NANANA46401Dallas Executive Airport C402
Greenville C1006/A19815151614936335055334037423944394336373854474053461Greenville C1006/A198
Pilot Point C103214849544135354752313436393741453839544851533550501Pilot Point C1032
Italy C1044/A32314950544331315047303634384245514037434155424251531Italy C1044/A323
Corsicana Airport C105115048534435344847333540394144474842404147454753461Corsicana Airport C1051
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C64424948564438344351324241383750454250384547524152452Longview C19/A127/C644
Tyler Airport Relocated C8214950594641354850344446423847454749444352473963471Tyler Airport Relocated C82
Karnack C85/AFHP30314748584941334552334241393640354049434948494651491Karnack C85/AFHP303
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X15124945464638394767565747635050494655805958546061492El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X15914945464838414772534947634751544254666867505854481Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 14947404740424766585348625156565159757369535958511Chamizal C41/AH126
Socorro Hueco C49/F31215146455237354365604846584352564254585447524954481Socorro Hueco C49/F312
Skyline Park C7215044454541454762495046575145504654635557515860521Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N4953535247506555464445404449525252545251525461593BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C4141NA43NANANA404160484544564446474249605657504955491Ivanhoe C414
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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Waco
Waco Mazanec C103715050544034345248323734364345564140404354454452491Waco Mazanec C1037
Temple Georgia C104515556594542NA5249364635325052634545445059534954531Temple Georgia C1045
Killeen Skylark Field C104715455594538375551374834294852594840505355565252571Killeen Skylark Field C1047
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 24460544550393543355132363640435045434345444948472Beaumont-Downtown C2/A112/C2002
West Orange C9/A14124458534144363340323229323236424843NANANA375342442West Orange C9/A141
Port Arthur West C28/A128/A22814854584947393742373539383747444946424443404648431Port Arthur West C28/A128/A228
Hamshire C64/C65414748544947393539343637413737424846414849444946431Hamshire C64/C654
SETRPC 40 Sabine Pass C640/C165415146605756453941453443433847445149454242394550471SETRPC 40 Sabine Pass C640/C1654
SETRPC 43 Jefferson Co Airport C64315058554751393743363939383746434847434545424848461SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 14851534447383643354235373744444946424345434647451Nederland High School C1035
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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Austin
Austin Northwest C3/A32225354534338324840304030284649514043434549484550502Austin Northwest C3/A322
Audubon C3815256534435335044324628244549544243454750484750531Audubon C38
Fayette County C6012 N5554604741304754293131304046614546424446455053392Fayette County C601
Dripping Springs School C6141 N4955514440315040313830274351534144454951464751541Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N5351544236304644282929274345494042404546424448401CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N5458574637365349354732294953564446475253545252531CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N5053524238314843303830274549504242414447383942441Gorzycki Middle School C1603
Lockhart C16041 N6060524037305040312829254150474042404446454449411Lockhart C1604
St. Edwards University C16051 N4547443631264334253325233940433637363840393943441St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N5054534139324643333230274650514343434448454751481CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N5355534537324947304233334947534043424447444549511CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G31624041504544403137353332293139434047474849495551402Houston East C1/G316
Houston Aldine C8/AF108/X150 24545544543393342363129313841454148575352535954462Houston Aldine C8/AF108/X150
Channelview C15/AH115 34444494446323236313030323744424143424645465145373Channelview C15/AH115
Northwest Harris Co. C26/A110/X15424847564242363746343130313848484144454446485052502Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23914145514848393438352934303645424245424744464848441Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4514246585152423638333334343450454547434244434747421Seabrook Friendship Park C45
Houston Bayland Park C53/A146 14549514647373539323629303943454344464243474649421Houston Bayland Park C53/A146
Conroe Relocated C78/A32114852614442374050453526363846554955635355587066471Conroe Relocated C78/A321
Manvel Croix Park C8414952554950413642333534364343474648464647475150421Manvel Croix Park C84
Clinton C403/C304/AH113 34247514648403435313334323740423942474341424442393Clinton C403/C304/AH113
Houston North Wayside C40514244504044363237353230303335443744534743445247381Houston North Wayside C405
Houston Monroe C40613638433943342731242626283133383738353637353836331Houston Monroe C406
Lang C408240444740433633352942243035404240434644444648NA372Lang C408
Houston Croquet C40924345504548383140323531303944454442434343464548402Houston Croquet C409
Houston Westhollow C41014747504644353441323429311846454343434344424952411Houston Westhollow C410
Park Place C41614043484348393038303529303536424144434243424647391Park Place C416
Sheldon C5511 N3637393731303034302626303235353536383838384137331Sheldon C551
Baytown Wetlands Center C5521 N3636413930242730221922262937343233282929262931291Baytown Wetlands Center C552
La Porte Sylvan Beach C5561 N2626333027242122201920212128262526222324222124221La Porte Sylvan Beach C556
Mercer Arboretum C5571 N3737413935313436323130333234373536403737383839351Mercer Arboretum C557
Katy Park C5591 N4045484337293338282824263231383636323536383741421Katy Park C559
Atascocita C5601 NNA4249393531NANANANANANANANANANANANANANANANANANA1Atascocita C560
Meyer Park C5611 N3938453331253036252419233033373136393638384440311Meyer Park C561
Huffman Wolf Road C5631 N55536835NANA3851413631394355223182NANANANANANANANA1Huffman Wolf Road C563
Clear Brook High School C5701 N4445514649383438303231363636384245414243444645381Clear Brook High School C570
Clear Creek High School C5711 N4034444141322933242224303337353639364239394040321Clear Creek High School C571
HRM-3 Haden Road C603/A114 1 N4146534944363339352733333747443144475048475649391HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N4847524445413639353234353846454548485051545450421Wallisville Road C617
Danciger C618 1 N4756535150373541312932284251484445394143424548401Danciger C618
Texas City 34th St. C620 1 N5059595359453842363235404557494950474744434851451Texas City 34th St. C620
UH Moody Tower C6951 N4348514650403340313730323942464446464547465249441UH Moody Tower C695
U of H-Sugarland C6961 N4750545049393845343537324243484546434446465053431U of H-Sugarland C696
UH Coastal Center C6971 N5148545055413737333232363951454646424342394244421UH Coastal Center C697
UH WG Jones Forest C6981 N4851594643383950422824344050544953635054556659531UH WG Jones Forest C698
UH West Liberty C6991 N4746574435333342312820303441444146506050556149401UH West Liberty C699
Lynchburg Ferry C1015/A165 12932474240333032312629282924NANANANANANANANANANA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 14755565555413440363035334150484649424143414649421Lake Jackson C1016
Baytown Garth C101715149534446423640373333343746444349495147515750441Baytown Garth C1017
Galveston 99th St. C1034/A320/X18314954605959473846423137454254515252514843415049461Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N4549494647352838392829303845454346434138384447391Oyster Creek C1607
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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San Antonio
San Antonio Northwest C2324452484634284541293031274152524344434648454747462San Antonio Northwest C23
Camp Bullis C58 14654514735314538313230274353524244444648474848561Camp Bullis C58
Calaveras Lake C5914552514536294338293131264749484042394045414546431Calaveras Lake C59
Elm Creek Elementary C5011 N4856534741334339313539344757504845434344434647601Elm Creek Elementary C501
Fair Oaks Ranch C5021 N4554524740334739333530274252534244464548485049561Fair Oaks Ranch C502
Bulverde Elementary C5031 N5157544837314839323631274454574446465254535051571Bulverde Elementary C503
New Braunfels Airport C5041 N4449483933274236302826234249453940394044404446441New Braunfels Airport C504
City of Garden Ridge C5051 N5157544837314739313229274553534244424748445152551City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N4547494234294038332926234150464040414044414448431Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N4655544636304540293331264651504443414146424848461Heritage Middle School C622
CPS Pecan Valley C6781 N4148483625243434232323253542373433303336313738391CPS Pecan Valley C678
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C424751504838302639293433283250494343414142404443412Corpus Christi West C4
Corpus Christi Tuloso C2114552474638292835303334283254504242404041394344401Corpus Christi Tuloso C21
Victoria C8715252504641303542282731284150464343414545434746421Victoria C87
Holly Road C6601 N5865626247373347364241354058595252515150495355521Holly Road C660
Violet C6641 N4050444136252431263332273050473938373739364038351Violet C664
Ingleside C6851 N4656535143342838303432303649544545434345414548441Ingleside C685
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP14314151473731282631283437242248403737383939374237391Mission C43/AP143
Brownsville C80/AGP18014348474630242629323236292849434041424242414442401Brownsville C80/AGP180
Harlingen Teege C102314351484532272726273543302950434041434342414641411Harlingen Teege C1023
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P24413844393625282827222630201736343133343536374034481Laredo 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

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.