Skip to main content

Daily Maximum Eight-Hour Ozone Averages for April 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2018 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 SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 239184143493434374754604741525361555252NVNA2Ft. Worth Northwest C13/AH302
Keller C17238204347523735424957604739515162555152NVNA2Keller C17
Midlothian OFW C52/A137145234449493837404959584442555861NV58NVNVNA1Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571NANV4146493634424548594737494862555051NVNA1Denton Airport South C56/A163/X157
Arlington Municipal Airport C6114120424650373641485759474052536154NV52NVNA1Arlington Municipal Airport C61
Dallas North No.2 C63/C679142214247463634434552615040525264565454NVNA1Dallas North No.2 C63/C679
Rockwall Heath C69139204051443736444855565036505159525357NVNA1Rockwall Heath C69
Grapevine Fairway C70/A301/X182138204346463836434954584739514961545353NVNA1Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X071143223947423435424350575437515357556054NVNA1Kaufman C71/A304/X071
Granbury C73/C681134194448523635274753604645535560565053NVNA1Granbury C73/C681
Eagle Mountain Lake C75 138224549553737404955644942545464575453NVNA1Eagle Mountain Lake C75
Parker County C76133224446503639324850584555525158545351NVNA1Parker County C76
Cleburne Airport C77/C682143204449523635305158644841535665575455NVNA1Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3NANV4348463736424855594740535261555457NVNA3Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021432343474837364348555948405254625656NANVNA1Dallas Executive Airport C402
Greenville C1006/A198139193845433635434346575334475058535553NVNA1Greenville C1006/A198
Pilot Point C1032138214146453635474750625039495064585254NVNA1Pilot Point C1032
Italy C1044/A3231432041494837353644585847395356NV536155NVNA1Italy C1044/A323
Corsicana Airport C1051147243848473635374351595438525756566153NVNA1Corsicana Airport C1051
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
Tyler-Longview-Marshall
Longview C19/A127/C6442443232473428323941455154NVNV5154645753NVNA2Longview C19/A127/C644
Tyler Airport Relocated C8214434374844NV32444549566538515460616057NVNA1Tyler Airport Relocated C82
Karnack C85/AFHP30314431NVNV343234434043485335424755574953NVNA1Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
El Paso-Juarez
El Paso UTEP C12/A125/X151248495150535237475264495059515757556351NVNA2El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X159145NV4747484734454956454654495451505951NVNA1Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 152535550575639515463545362545961596446NVNA1Chamizal C41/AH126
Socorro Hueco C49/F312146454847505038414952494555505157545750NVNA1Socorro Hueco C49/F312
Skyline Park C72150515652575743515263565562526162596553NVNA1Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N53494544485543425742515559535862636160NVNA3BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C414149505448555539505158535059525660566052NVNA1Ivanhoe C414
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
Waco
Waco Mazanec C10371442039474935322338565847NANANANV526151NVNA1Waco Mazanec C1037
Temple Georgia C1045147213946473933254055624442535360566453NVNA1Temple Georgia C1045
Killeen Skylark Field C1047151254149534234323954NV4946545665616356NVNA1Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 245262546483527282647524831375464514854NVNA2Beaumont-Downtown C2/A112/C2002
West Orange C9/A141251313046493728322946525132384965554749NVNA2West Orange C9/A141
Port Arthur West C28/A128/A228144272744483426302746525031405358534551NVNA1Port Arthur West C28/A128/A228
Hamshire C64/C654144262746473428302647515232395660574955NVNA1Hamshire C64/C654
SETRPC Port Arthur C6281 NNANANANANANANANANANANANANANANANANANA54NVNA1SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C1654149312847493727293645545334385562544858NVNA1SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 NNANANANANANANANANANANANANANANANANANA55NVNA1SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C643147292945503628312749545333435561554853NVNA1SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 148313245473527322752555636405364585156NVNA1Nederland High School C1035
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
Austin
Austin Northwest C3/A322245284148463631343752604343505257536552NVNA2Austin Northwest C3/A322
Audubon C38145284148473830353652624441485058546352NVNA1Audubon C38
Fayette County C6012 N43303645472627313350584137495255495152NVNA2Fayette County C601
Dripping Springs School C6141 N46324249463830413753634452475358556555NVNA1Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N36243541362525263039513530414545445441NVNA1CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N48254250493931363954614641525360566354NVNA1CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N432940474435283435536042266623232324NVNA1Gorzycki Middle School C1603
Lockhart C16041 N39263944432926323546554038455452496753NVNA1Lockhart C1604
St. Edwards University C16051 N41263945422928313550543943465053496449NVNA1St. Edwards University C1605
CAPCOG San Marcos Staples Road C16751 N45303746453227383151614141455357536352NVNA1CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 N43234047443432304154574244515456536652NVNA1CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
Houston-Galveston-Brazoria
Houston East C1/G316244262938432923241841525335415559554848NVNA2Houston East C1/G316
Houston Aldine C8/AF108/X150 249303244452724252450565642475962585058NVNA2Houston Aldine C8/AF108/X150
Channelview C15/AH115 342243039432824222646454938445751544955NVNA3Channelview C15/AH115
Northwest Harris Co. C26/A110/X15424530324645252323NVNV555042465458524657NVNA2Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP239143282743473424272247535237425558554955NVNA1Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C45142252442453221272244504633405153474352NVNA1Seabrook Friendship Park C45
Houston Bayland Park C53/A146 143272945482623262652535242485759524062NVNA1Houston Bayland Park C53/A146
Conroe Relocated C78/A321155373645502825283045666243395166614861NVNA1Conroe Relocated C78/A321
Manvel Croix Park C84144283150513025272154545442496161NV4661NVNA1Manvel Croix Park C84
Clinton C403/C304/AH113 341232942422223222148454334405350483955NVNA3Clinton C403/C304/AH113
Houston North Wayside C405139232935372122212040444429365053484053NVNA1Houston North Wayside C405
Houston Monroe C406139242638442920222040454635405450504549NVNA1Houston Monroe C406
Lang C408243272842392523222245515141455659514556NVNA2Lang C408
Houston Croquet C409241262842442621232046484838425052474454NVNA2Houston Croquet C409
Houston Westhollow C410142273046462623262550524945455356514560NVNA1Houston Westhollow C410
Park Place C416142262741452921251745504935405356534656NVNA1Park Place C416
Baytown Wetlands Center C5521 N34172033351316201636413720354246373745NVNA1Baytown Wetlands Center C552
Crosby Library C5531 N47313043483025282346565337455959575056NVNA1Crosby Library C553
La Porte Sylvan Beach C5561 N27171728321912181329363721334042363127NVNA1La Porte Sylvan Beach C556
Tom Bass C5581 N3422231939211214420454520323950463621NVNA1Tom Bass C558
Katy Park C5591 N35192440391718211639434136394647443650NVNA1Katy Park C559
Atascocita C5601 N42222540421920211942554930415561524054NVNA1Atascocita C560
Meyer Park C5611 N31212132321617172033393725323741373140NVNA1Meyer Park C561
Bunker Hill Village C5621 N33212437361620202141434129394648413651NVNA1Bunker Hill Village C562
Huffman Wolf Road C5631 N27171723241414151226313020223135342432NVNA1Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N39243040432424212144484636405456524554NVNA1HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N47293345493327272550575444466162555559NVNA1Wallisville Road C617
Texas City 34th St. C620 1 N45273048493327283049545138455957524756NVNA1Texas City 34th St. C620
UH Moody Tower C6951 N44272944473024242149545240475758534860NVNA1UH Moody Tower C695
UH WG Jones Forest C6981 N51353547502824NV3347626044525966604760NVNA1UH WG Jones Forest C698
UH West Liberty C6991 N45302841412724252344565235425462544653NVNA1UH West Liberty C699
Lynchburg Ferry C1015/A165 142242939NV3120252037475134385253554547NVNA1Lynchburg Ferry C1015/A165
Lake Jackson C1016 140272753493222272159NV51384455575447NVNVNA1Lake Jackson C1016
Baytown Garth C1017148313244503426282548575441445962555557NVNA1Baytown Garth C1017
Galveston 99th St. C1034/A320/X183149312852523828292952585740496261585160NVNA1Galveston 99th St. C1034/A320/X183
Oyster Creek C1607 1 N45272653513221252554545231425457554760NVNA1Oyster Creek C1607
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
San Antonio
San Antonio Northwest C23246344249443230423756604350455555536155NVNA2San Antonio Northwest C23
Camp Bullis C58 148354250453231423753644551455657566158NVNA1Camp Bullis C58
Calaveras Lake C59147324150433132403654614344455656535954NVNA1Calaveras Lake C59
Elm Creek Elementary C5011 N44324148432931393456584243455454514854NVNA1Elm Creek Elementary C501
Fair Oaks Ranch C5021 N45344048423129393449604449435054545655NVNA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N46344149423229433452634549445356545955NVNA1Bulverde Elementary C503
New Braunfels Airport C5041 N43293743412927393149584041425553505848NVNA1New Braunfels Airport C504
City of Garden Ridge C5051 N46334248423131423554624050465856526554NVNA1City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N44303544423026392946594132415555515449NVNA1Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N43303746402929383151583941445552485350NVNA1Heritage Middle School C622
CPS Pecan Valley C6781 N23162530231419232033301922262928272931NVNA1CPS Pecan Valley C678
Government Canyon C16101 N44334351423030403754604349455455545257NVNA1Government Canyon C1610
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
Corpus Christi-Victoria
Corpus Christi West C42372625454221253126534842384454NV454059NVNA2Corpus Christi West C4
Corpus Christi Tuloso C21135252542382126322452494038445450NV4157NVNA1Corpus Christi Tuloso C21
Victoria C87138253051412325332045524239434948474450NVNA1Victoria C87
Violet C6641 N25171844301420NVNANANANANANANANANANVNANANA1Violet C664
Ingleside C6851 N442724NVNANANANANANANANANANANANANANANANANA1Ingleside C685
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
Lower Rio Grande Valley
Mission C43/AP1431352631393525313835414936NV505751474748NVNA1Mission C43/AP143
Harlingen Teege C1023138282940302429333045533636495652504750NVNA1Harlingen Teege C1023
AreaMonitoring SitePOCApril 2018POCMonitoring Site
123456789101112131415161718192021
Laredo
Laredo Vidaurri C44/AFGP144/P244141324039353333382748484342464952484452NVNA1Laredo 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.