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Peak Daily One-Hour Ozone Averages for May 2020

The table below lists the peak daily one-hour ozone concentrations measured in May 2020 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 SitePOCMay 2020POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 2664945554880634360634950424855495161936648485844453969622Ft. Worth Northwest C13/AH302
Keller C172644846544964624558595151424652454362925843485244373368492Keller C17
Frisco C31/C6801715455595456694953555850474957464980724048506248453260491Frisco C31/C680
Midlothian OFW C52/A1371654847535468604549505249434252445160674242425339463755661Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571695449574955694755566248474951484682774351555549373060471Denton Airport South C56/A163/X157
Arlington Municipal Airport C611685150565279644453565249454653455059734841465240433861591Arlington Municipal Airport C61
Dallas North No.2 C63/C6791675451545161664752555648464456485080884243465344443673511Dallas North No.2 C63/C679
Rockwall Heath C691634942434951694747475242463854354672623738394739403273461Rockwall Heath C69
Grapevine Fairway C70/A301/X18217356546456717254616361544850605049741015445516143433576531Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711715454495057795050545345504155345261594943404937434555531Kaufman C71/A304/X071
Granbury C73/C6811715346575365624654565653455550474958585344535644454155601Granbury C73/C681
Eagle Mountain Lake C75 1705346605165654764665756475156484961916448615547424077541Eagle Mountain Lake C75
Parker County C761705145555277614760665956464254454459616245535542293348421Parker County C76
Cleburne Airport C77/C6821725447666272725560596056465256485163644943455738524161771Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3655450525569654855565248434358444970854941445443433471573Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021665552525471654854565652464658475164755042445436444064611Dallas Executive Airport C402
Greenville C1006/A1981645851474649754748485137463750354579483635464740413363481Greenville C1006/A198
Pilot Point C10321725455625053674952566149485150464887544254575448423150491Pilot Point C1032
Italy C1044/A3231644948505559664651495450454254435566644342415336504054651Italy C1044/A323
Corsicana Airport C10511664951504956774452525445504252385557524144404635NANANA551Corsicana Airport C1051
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C6442585144524453565151465044463440554352593836354332384651522Longview C19/A127/C644
Tyler Airport Relocated C821746142484454664955535145463750594656564337434735424349511Tyler Airport Relocated C82
Karnack C85/AFHP3031605145414452545044475851453740473856484037424330364441511Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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El Paso-Juarez
El Paso UTEP C12/A125/X151/G1252NA4453555886675478618256505357555567505258615552577964742El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X1591495050545671655376587552475155575881495560695653617562631Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1575454575175655578577755515558565678545259605551587564641Chamizal C41/AH126
Socorro Hueco C49/F3121616154565665725381607355505156625865535457665849617361581Socorro Hueco C49/F312
Skyline Park C721555153575676666378597755495358555465555559615758556955611Skyline Park C72
Ivanhoe C414/F5141545055565570665373587355505157576475535258695557577360571Ivanhoe C414/F514
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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Waco
Waco Mazanec C10371674949506357674949485948464248505269625143444540514456601Waco Mazanec C1037
Temple Georgia C10451674847556463614951556244434846495276654843533640484353571Temple Georgia C1045
Killeen Skylark Field C10471695350616064604750556044465349475272736045543651504252531Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2615246384953595244475754524841604576533543322954636759502Beaumont-Downtown C2/A112/C2002
West Orange C9/A141264535146495356534746NA55504841604161614142332856695461502West Orange C9/A141
Port Arthur West C28/A128/A2281NANA37192362503855435440NANA40594369473243312755616052451Port Arthur West C28/A128/A228
Hamshire C64/C6541605046395159595248565651473942624699503539252556658460451Hamshire C64/C654
SETRPC Port Arthur C6281 N655349424067585353NANANANANANANANANANANANANANANANANANANA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541635047383667565043615551484542597072493342312657687756471SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N746054494755635546486456525035634551624346363259665661571SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431625147394554565249555654514745604676513642352960656356491SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1584945374551555046465551494438594268493341292853606353461Nederland High School C1035
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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Austin
Audubon C381674845506060574948536039405142485070615243473243434347471Audubon C38
Dripping Springs School C6141 N73524954667257555862603945535053557840NANA494555494863451Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N5437354248434736384147293338403437575247323622313539NANA1CAPCOG Lake Georgetown C690
Lockhart C16041 N654447484760525347535448375148485562434337383141465251471Lockhart C1604
St. Edwards University C16051 N594241445053504842485038344342454659474037383141444354621St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N684647474357575247515846415140515262434339383144475449491CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N694546475060595247535843404841495161464539393332445057511CAPCOG Elgin C1613
CAPCOG East Austin C16191 N674648505358575147535746405049505266544541423347494860651CAPCOG East Austin C1619
CAPCOG San Marcos Staples Road C16751 N533836404047404436444434294841424158414443473349485056561CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N674545475656574947505743404646485167574540423443484452561CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G31626355514777526555435659524851355652104504642303345606666462Houston East C1/G316
Houston Aldine C8/AF108/X150 2695651465550705244507054514434504984554443273041546061472Houston Aldine C8/AF108/X150
Channelview C15/AH115 36052504865475851424954514644345750121524940283049626867363Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542705557473754705445509155516042495071474750353647445456512Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP23916554494572566555476057534754425554100454942283254556558421Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C4516048413540565649485955474049394951108403836292850506147411Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1695448405766665654666653506349535271454245302954505760441Houston Bayland Park C53/A146
Conroe Relocated C78/A3211806659633952755645436658624749434762556256404249505058561Conroe Relocated C78/A321
Manvel Croix Park C841595348404865605153695450455248505373423637282749485750401Manvel Croix Park C84
Clinton C403/C304/AH113 35549483966566050465776454047NANANA83393437292946495250373Clinton C403/C304/AH113
Houston North Wayside C4051574845395644594638455747444130474281434138252939505054431Houston North Wayside C405
Houston Monroe C406154464537535558524660574841504131NA69413536272447495852381Houston Monroe C406
Lang C4082655447415353575244556850495342504973454744303047475456512Lang C408
Houston Croquet C4092595044365468585049675848455140484968403740292647465654382Houston Croquet C409
Houston Westhollow C4101635053445061605248606252445249515066434043293055475655471Houston Westhollow C410
Park Place C4161605046386157575046635847444839494885444037292545495955421Park Place C416
Sheldon C5511 N6152484957495752444756514531NANANANANANANANANANANANANANA1Sheldon C551
Baytown Wetlands Center C5521 N6551463954536154446058524949345551120454338282747586756391Baytown Wetlands Center C552
Crosby Library C5531 N635250505345574840425448463927342491403724302438606269451Crosby Library C553
West Houston C5541 N48323222274450393845504224NANANANANANANANANANANANANANANA1West Houston C554
La Porte Sylvan Beach C5561 N6249443743566153486260534652395154115433940332757536163441La Porte Sylvan Beach C556
Mercer Arboretum C5571 N675650504447694941466956534341464266515255323839465157571Mercer Arboretum C557
Tom Bass C5581 N595247415467605050705949435342505175423637272846505752391Tom Bass C558
Katy Park C5591 N635147404362615050596450425244494861413941293251455250451Katy Park C559
Atascocita C5601 N655452535346625140435753514536474377545247313746545460501Atascocita C560
Meyer Park C5611 N715752514053695346508353545344484568485346333343435255561Meyer Park C561
Bunker Hill Village C5621 N624745394955584845576148445535454663404540282642435151441Bunker Hill Village C562
Huffman Wolf Road C5631 N7561606452496255444459545640405948102677250363451655976601Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N5948474470506149445454494343335248100474137253046566260391HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N6955514770556659466160545248396454127565346313353708080481Wallisville Road C617
Texas City 34th St. C620 1 N6855504039736761617464584962446062127483743343160627858501Texas City 34th St. C620
UH Moody Tower C6951 N655550446460655351636352485143545391484642293047576564471UH Moody Tower C695
UH WG Jones Forest C6981 N766556584152775646476960624550465069545761394548475160581UH WG Jones Forest C698
UH West Liberty C6991 N685453544945595241415448503729604397635944312849655773511UH West Liberty C699
Lynchburg Ferry C1015/A165 16053484466526054435356524649355346118464239262948556462381Lynchburg Ferry C1015/A165
Lake Jackson C1016 1605348353263645657725651435150564958413638272840515352461Lake Jackson C1016
Baytown Garth C101716854494666526257435856535148396252123545245323251687677481Baytown Garth C1017
Galveston 99th St. C1034/A320/X18316754503937596560496661555155455956105563841312954657254501Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N635148383658605652625550465150584962493841313351575755551Oyster Creek C1607
UH Launch Trailer C16111 N625349436358635247606050474844385290464539292946556362471UH Launch Trailer C1611
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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San Antonio
San Antonio Northwest C232665049525764515452646348496553555467545655503954485153812San Antonio Northwest C23
Camp Bullis C58 1745755615966565757646547517354575574646459554155565457771Camp Bullis C58
Calaveras Lake C591645248515967515851575846496248NANANA494852503556546057521Calaveras Lake C59
Elm Creek Elementary C5011 N614945465558465246575443435549516556464654444156484550561Elm Creek Elementary C501
Fair Oaks Ranch C5021 N655147545258474847565740446348484760545952483648494450491Fair Oaks Ranch C502
Bulverde Elementary C5031 N624846535155444743535336426245464464585550483246484149481Bulverde Elementary C503
New Braunfels Airport C5041 N594742464854474943505042425848484562434140403245434750461New Braunfels Airport C504
City of Garden Ridge C5051 N594645475357464844525236446247494864554444443949485050641City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N614948494760475446535239426248494960484038403036NA7245491Seguin Outdoor Learning Center C506
Heritage Middle School C6221 NNANANANANANANA4443494940425536525454414346434151505249461Heritage Middle School C622
CPS Pecan Valley C6781 N554241434853444541505139405144485256444141423845404545521CPS Pecan Valley C678
Government Canyon C16101 N58464245536145475159584041544647475342504542341371443149601Government Canyon C1610
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C42554746383151484152514643464828605955353132282529606248422Corpus Christi West C4
Corpus Christi Tuloso C211594948423555514554564846455131606357413434332660706053451Corpus Christi Tuloso C21
Victoria C871614847394267524960655248476146585260383635292952585256501Victoria C87
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP1431514243394038374649494539333433555744353435415046485148411Mission C43/AP143
Harlingen Teege C10231544442383939354244444239333032545050343339343333474946371Harlingen Teege C1023
AreaMonitoring SitePOCMay 2020POCMonitoring Site
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Laredo
Laredo Vidaurri C44/AFGP144/P2441565046464050505551515142425145605354474348515353467552481Laredo 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.