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Peak Daily One-Hour Ozone Averages for May 2019

The table below lists the peak daily one-hour ozone concentrations measured in May 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 SitePOCMay 2019POCMonitoring Site
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 248524947574738482528344455725762475758322Ft. Worth Northwest C13/AH302
Keller C17248494845535041482931334559756266505852402Keller C17
Frisco C31/C680149635446636046524331305175827482506659451Frisco C31/C680
Midlothian OFW C52/A137147494858504740484730375458636456444067371Midlothian OFW C52/A137
Denton Airport South C56/A163/X157149565243625550472830324967796771485953341Denton Airport South C56/A163/X157
Arlington Municipal Airport C61143464547494738473828345254656057474569381Arlington Municipal Airport C61
Dallas North No.2 C63/C679146565050565742514129325567747073475961441Dallas North No.2 C63/C679
Rockwall Heath C69148464347485232483530264756615956344552351Rockwall Heath C69
Grapevine Fairway C70/A301/X182148524845584843483433324461776270456355411Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071149493249495641514928265758606361496453361Kaufman C71/A304/X071
Granbury C73/C6811NANA5351524842493034334362575655415175391Granbury C73/C681
Eagle Mountain Lake C75 15458574964564435NA30364760746164515860361Eagle Mountain Lake C75
Parker County C76156555348535143543334334157655756426560371Parker County C76
Cleburne Airport C77/C682154585156504944544429374661626364515484441Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 34951465054NANANA3829315360656164455164403Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C402150524754525042474930346262706562474768371Dallas Executive Airport C402
Greenville C1006/A198149484345495739494127224254586758415652271Greenville C1006/A198
Pilot Point C10321506156476865515230333047748974845135NA441Pilot Point C1032
Italy C1044/A323132514555454230454928315758625852415258271Italy C1044/A323
Corsicana Airport C1051145503449555940495828285256636468505152461Corsicana Airport C1051
AreaMonitoring SitePOCMay 2019POCMonitoring Site
Longview C19/A127/C644246472840545144465020304282546159464344272Longview C19/A127/C644
Tyler Airport Relocated C82154522845525337503925354365616864483041271Tyler Airport Relocated C82
Karnack C85/AFHP303141533637525354313718NANANA647361545044301Karnack C85/AFHP303
AreaMonitoring SitePOCMay 2019POCMonitoring Site
El Paso-Juarez
El Paso UTEP C12/A125/X151/G125252525757575544486940494958716956496462582El Paso UTEP C12/A125/X151/G125
Ascarate Park SE C37/A332/A172/X159148505558534844476538NANA60736551536264611Ascarate Park SE C37/A332/A172/X159
Socorro Hueco C49/F312154626260655549496339644768706157516365641Socorro Hueco C49/F312
Skyline Park C72156586061596149516940535463706858576770661Skyline Park C72
Ivanhoe C414/F514156576164605649506338565265716359556668681Ivanhoe C414/F514
AreaMonitoring SitePOCMay 2019POCMonitoring Site
Waco Mazanec C1037127554453424240495128304467575750404447291Waco Mazanec C1037
Temple Georgia C1045130555648493840464235314555595555373847291Temple Georgia C1045
Killeen Skylark Field C104713258565153NANANA233530NA58566460404150321Killeen Skylark Field C1047
AreaMonitoring SitePOCMay 2019POCMonitoring Site
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 243423248736245403851223351596154453833242Beaumont-Downtown C2/A112/C2002
West Orange C9/A141239483244745136463654423250576060433736292West Orange C9/A141
Port Arthur West C28/A128/A228139423148505241414971253450565264545535261Port Arthur West C28/A128/A228
Hamshire C64/C654136423244495236393259263361645957413635221Hamshire C64/C654
SETRPC Port Arthur C6281 N39453351485439464158353561565562553832261SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654136443355485140433728243659565356523435251SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N41533345565741433851293453736356433634271SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C64314247335464574542395531385263576355NANA211SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1384130455752404136NANA3349555253463431241Nederland High School C1035
AreaMonitoring SitePOCMay 2019POCMonitoring Site
Austin Northwest C3/A322228484248583946453936234152566248382950292Austin Northwest C3/A322
Audubon C38126413643563539433335214054596651393054281Audubon C38
Dripping Springs School C6141 N28485247614648483635264155625551363054301Dripping Springs School C614
CAPCOG Lake Georgetown C6901 N32535145594042473636254258546760413250321CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N27434745553446443935213951565146352842271Gorzycki Middle School C1603
Lockhart C16041 N31505352583750493935244354534747372945281Lockhart C1604
St. Edwards University C16051 N24424244513140393331193747484440322538241St. Edwards University C1605
CAPCOG Bastrop CAMS16121 N29474945553545443728183760515242342441241CAPCOG Bastrop CAMS1612
CAPCOG Elgin C16131 N28474746523441423632224053515642332742271CAPCOG Elgin C1613
CAPCOG San Marcos Staples Road C16751 N35505551623750504739304752555046363145281CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N29494845513843463636244250505345342843251CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCMay 2019POCMonitoring Site
Houston East C1/G316234352457605933NA5049183368685658392935232Houston East C1/G316
Houston Aldine C8/AF108/X150 237422558757143496354273956706870463043282Houston Aldine C8/AF108/X150
Channelview C15/AH115 331352555514944494956263360665155403034203Channelview C15/AH115
Northwest Harris Co. C26/A110/X154234422447677550495344273947658273392841282Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239134393061575653464559273669595255423128221Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45133392954465150454856303561575150443124201Seabrook Friendship Park C45
Houston Bayland Park C53/A146 1364529NANANA59535859305292826261393238241Houston Bayland Park C53/A146
Conroe Relocated C78/A321148463350666847534349324050666072553452421Conroe Relocated C78/A321
Manvel Croix Park C8413341296350505843NANANANANA555955343133251Manvel Croix Park C84
Clinton C403/C304/AH113 325342256535545384653223367644853372630183Clinton C403/C304/AH113
Houston North Wayside C405132362454616040435050243456615959392636231Houston North Wayside C405
Houston Monroe C406127342351485028NA3652183359535055343130231Houston Monroe C406
Lang C408233392454586348496142274356726266412841252Lang C408
Houston Croquet C409232412656525654465056244874615555352931212Houston Croquet C409
Houston Westhollow C410136413055576357496455294492886258392938231Houston Westhollow C410
Park Place C416134382760585954524857233974605157363033221Park Place C416
Baytown Wetlands Center C5521 N27312044364230292744132746464344362514121Baytown Wetlands Center C552
Crosby Library C5531 N28302136414126313645152642554746332833171Crosby Library C553
La Porte Sylvan Beach C5561 NNA222140313632322635152138393841372215141La Porte Sylvan Beach C556
Tom Bass C5581 N34402963545859464661314372605457373131271Tom Bass C558
Katy Park C5591 N32412952575953486146204378896858372737271Katy Park C559
Atascocita C5601 N28292236524833374042162543504446382337201Atascocita C560
Meyer Park C5611 N34402745677345405545333949657170392741271Meyer Park C561
Huffman Wolf Road C5631 N22221724323324262731131927393132252128161Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N32382559596050455259213571635657422835231HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N36402950475043504459293556665054423526221Wallisville Road C617
Danciger C618 1 NNANA3556555056495363344817515746332828211Danciger C618
Texas City 34th St. C620 1 N39413475545757485865443758666059593727231Texas City 34th St. C620
UH Moody Tower C6951 N3741286461645646545729NA86825761383335241UH Moody Tower C695
UH WG Jones Forest C6981 N42443551727746495250334351696676573451391UH WG Jones Forest C698
UH West Liberty C6991 NNA3525NANANA37414451193246675249363237221UH West Liberty C699
Lynchburg Ferry C1015/A165 133382750465156475060273063605051433330201Lynchburg Ferry C1015/A165
Lake Jackson C1016 134322856525257534660315361586052383323211Lake Jackson C1016
Baytown Garth C10171445138636066596740NANANANANA4952403729241Baytown Garth C1017
Galveston 99th St. C1034/A320/X183136353477505351534763503452605858573729241Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N36302860485458542336183342555550403320181Oyster Creek C1607
AreaMonitoring SitePOCMay 2019POCMonitoring Site
San Antonio
San Antonio Northwest C23225404449593840424523284255635749322950322San Antonio Northwest C23
Camp Bullis C58 126435051634344454725284460666257383451381Camp Bullis C58
Calaveras Lake C59131445455583841423932364549504952343649331Calaveras Lake C59
Elm Creek Elementary C5011 N26344558554436543426344645594340312944321Elm Creek Elementary C501
Fair Oaks Ranch C5021 N24434746614542434124263759596257373252361Fair Oaks Ranch C502
Bulverde Elementary C5031 N24404644563838403723243749565149333049321Bulverde Elementary C503
New Braunfels Airport C5041 N27444850553442413530254043444243322840251New Braunfels Airport C504
City of Garden Ridge C5051 N25414548573334393931264349594746322943291City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N30464849563543423329254045484845332944271Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N25414852543534403628344139464446302946291Heritage Middle School C622
CPS Pecan Valley C6781 N8353647492731403123303841NANANANANANANA1CPS Pecan Valley C678
Government Canyon C16101 N26414647614337424825304162646450352750341Government Canyon C1610
AreaMonitoring SitePOCMay 2019POCMonitoring Site
Corpus Christi-Victoria
Corpus Christi West C4233335762595654444552304952505047383134322Corpus Christi West C4
Corpus Christi Tuloso C2113031545254534640404428434533NANANANANANA1Corpus Christi Tuloso C21
Victoria C87134355962555441445631214253524946362236251Victoria C87
AreaMonitoring SitePOCMay 2019POCMonitoring Site
Lower Rio Grande Valley
Mission C43/AP143132322645414139404346303637353941233640331Mission C43/AP143
Harlingen Teege C1023139403156474243414462354546454242294242371Harlingen Teege C1023
AreaMonitoring SitePOCMay 2019POCMonitoring Site
Laredo Vidaurri C44/AFGP144/P244133272137434737373619263929302827223935301Laredo 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.