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Daily Maximum Eight-Hour Ozone Averages for April 2015

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2015 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 2015POCMonitoring Site
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Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 23237434628343325334140303927494428NV232Ft. Worth Northwest C13/AH302
Keller C172323639452736332431424129372451463154252Keller C17
Frisco C31/C6801334240443238382841394733412559494554331Frisco C31/C680
Midlothian OFW C52/A1371323542422934342433363729342545433245321Midlothian OFW C52/A137
Denton Airport South C56/A163/X1571334243463240372737435134422758493753281Denton Airport South C56/A163/X157
Arlington Municipal Airport C6113034404329323321313336273524454230NANA1Arlington Municipal Airport C61
Dallas North No.2 C63/C6791303839422835352539374631362355433752251Dallas North No.2 C63/C679
Rockwall Heath C691343744453234352741404731392458444348361Rockwall Heath C69
Grapevine Fairway C70/A301/X1821313742462735342538424631392554453458281Grapevine Fairway C70/A301/X182
Kaufman C71/A304/X0711343542413032342633344429322046404043321Kaufman C71/A304/X071
Granbury C73/C6811404245503236392435433331413144443949251Granbury C73/C681
Eagle Mountain Lake C75 1313541452833322232404028382548442646241Eagle Mountain Lake C75
Parker County C761374447533536362647503732423049443651331Parker County C76
Cleburne Airport C77/C6821353945453139372532373429382842433747271Cleburne Airport C77/C682
Dallas Hinton St. C401/C60/AH161 3303741452634342238394429362051433352263Dallas Hinton St. C401/C60/AH161
Dallas Executive Airport C4021273238402430322235343626322045392941261Dallas Executive Airport C402
Greenville C1006/A1981353543402832342836374228352046NANV42301Greenville C1006/A198
Pilot Point C10321334240413138372741424433432854454048331Pilot Point C1032
Italy C1044/A3231333644423034362636384027352547423743261Italy C1044/A323
Corsicana Airport C10511333343442931352530323727342642463544291Corsicana Airport C1051
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Tyler-Longview-Marshall
Longview C19/A127/C64423742414132324538343146242617NVNV5445402Longview C19/A127/C644
Tyler Airport Relocated C821363742463240383431325227311741444743381Tyler Airport Relocated C82
Karnack C85/AFHP3031354239372731413230304429202037413735351Karnack C85/AFHP303
AreaMonitoring SitePOCApril 2015POCMonitoring Site
12345678910111213141516171819
El Paso-Juarez
El Paso UTEP C12/A125/X1512464756434644394351343939445351555754452El Paso UTEP C12/A125/X151
Ascarate Park SE C37/A332/A172/X1591394053403936333349293735444643484948391Ascarate Park SE C37/A332/A172/X159
Chamizal C41/AH126 1474754354745404250304041424852565957441Chamizal C41/AH126
Socorro Hueco C49/F3121464653414542373551343839465250505655361Socorro Hueco C49/F312
Skyline Park C721484754434947425254374444455553626355491Skyline Park C72
BRAVO Big Bend C67/C316/C656/C6913 N514651404235333342383144NV4049514963583BRAVO Big Bend C67/C316/C656/C691
Ivanhoe C4141464751384444394753354139444950565654431Ivanhoe C414
AreaMonitoring SitePOCApril 2015POCMonitoring Site
12345678910111213141516171819
Waco
Waco Mazanec C10371313544412734362532343125372845444242311Waco Mazanec C1037
Temple Georgia C10451374046462438422839372726453649444444261Temple Georgia C1045
Killeen Skylark Field C10471414248462942442938422428463851424143271Killeen Skylark Field C1047
AreaMonitoring SitePOCApril 2015POCMonitoring Site
12345678910111213141516171819
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 2384231372132272925213127504553433834342Beaumont-Downtown C2/A112/C2002
West Orange C9/A1412323830342425252724202724453948413531302West Orange C9/A141
Port Arthur West C28/A128/A2281364029362730262724272826474256474234331Port Arthur West C28/A128/A228
Hamshire C64/C6541364231392632283026233227524552474233341Hamshire C64/C654
SETRPC Port Arthur C6281 N363930382925282722262824464457484335381SETRPC Port Arthur C628
SETRPC 40 Sabine Pass C640/C16541303229333025NV231920241929303632261391SETRPC 40 Sabine Pass C640/C1654
SETRPC Mauriceville 42 C642/C311/C6651 N364229352321283027193427494246413931301SETRPC Mauriceville 42 C642/C311/C665
SETRPC 43 Jefferson Co Airport C6431353928352428NV2320202421413547383526261SETRPC 43 Jefferson Co Airport C643
Nederland High School C1035 1374030362330272825243326514459454034341Nederland High School C1035
AreaMonitoring SitePOCApril 2015POCMonitoring Site
12345678910111213141516171819
Austin
Austin Northwest C3/A3222373545402836372733331929443948383837232Austin Northwest C3/A322
Audubon C381413945433139422937361629433951394037241Audubon C38
Fayette County C6012 N34324236263332282624242941334641NVNANA2Fayette County C601
Dripping Springs School C6141 N413543412635412938352030423847383542251Dripping Springs School C614
CAPCOG McKinney Roughs C6841 N383445401836373131302429454345383941301CAPCOG McKinney Roughs C684
CAPCOG Lake Georgetown C6901 N414045423040442939352130453853434241291CAPCOG Lake Georgetown C690
Gorzycki Middle School C16031 N454253483344473542402233544354424652331Gorzycki Middle School C1603
Lockhart C16041 N363546402436342932302127464044353936251Lockhart C1604
CAPCOG San Marcos Staples Road C16751 N383643382538403236332230483945353735251CAPCOG San Marcos Staples Road C1675
CAPCOG Hutto College Street C66021 NNANANANANANANANANANANANANANV40384143331CAPCOG Hutto College Street C6602
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Houston-Galveston-Brazoria
Houston East C1/G31623438333219303231309262551366244NVNANA2Houston East C1/G316
Houston Aldine C8/AF108/X150 2314137362333353229152629533466464136252Houston Aldine C8/AF108/X150
Channelview C15/AH115 3NV3131302123242323142620473445443629233Channelview C15/AH115
Northwest Harris Co. C26/A110/X1542313637342331323027192828432654414538272Northwest Harris Co. C26/A110/X154
Hou.DeerPrk2 C35/235/1001/AFH139FP2391323527312528252624102824433755403830231Hou.DeerPrk2 C35/235/1001/AFH139FP239
Seabrook Friendship Park C451373826363030272925133227454658504734291Seabrook Friendship Park C45
Houston Bayland Park C53/A146 13033343426272525231127244431594135NVNA1Houston Bayland Park C53/A146
Conroe Relocated C78/A3211364239362840433933213231471552484437261Conroe Relocated C78/A321
Manvel Croix Park C841344032412732293129142927484758NV4038331Manvel Croix Park C84
Clinton C403/C304/AH113 3293030311622242323122524372860393426203Clinton C403/C304/AH113
Houston North Wayside C4051253231301824262322132423392555372925121Houston North Wayside C405
Houston Monroe C4061NANANANANANV2321238222038345428NANANA1Houston Monroe C406
Lang C4082313434341929292826102326452663404032222Lang C408
Houston Croquet C4092333632342630282926123027483857NANV33302Houston Croquet C409
Houston Westhollow C4101323536402630302828162527462962443936321Houston Westhollow C410
Houston Texas Avenue C4111273131311525252524112624423153383631271Houston Texas Avenue C411
Park Place C4161313729312528292727102826443764393931231Park Place C416
Sheldon C5511 N283331301825282626162122453045382924191Sheldon C551
Baytown Wetlands Center C5521 N242319231719181815122018282831292619191Baytown Wetlands Center C552
Crosby Library C5531 N303528302025252725142122482841343226221Crosby Library C553
West Houston C5541 N283235361927282023132124382556354031241West Houston C554
La Porte Sylvan Beach C5561 N36363034262724272415282441444844NVNANA1La Porte Sylvan Beach C556
Mercer Arboretum C5571 N263332322129312926152024401850343430191Mercer Arboretum C557
Tom Bass C5581 N293327332326252524112322383653373427271Tom Bass C558
Katy Park C5591 N262832341924242120142223352347333329271Katy Park C559
Atascocita C5601 N273430282128312926142123432644363226181Atascocita C560
Meyer Park C5611 NNV3231302028292625132023371950333529201Meyer Park C561
Bunker Hill Village C5621 N273532341628272324122222392453353525201Bunker Hill Village C562
Huffman Wolf Road C5631 N343735352331282928122223492939363729231Huffman Wolf Road C563
HRM-3 Haden Road C603/A114 1 N323934342231313030142924513658453829231HRM-3 Haden Road C603/A114
Wallisville Road C617 1 N384034362332313228203329554450NANANANA1Wallisville Road C617
Danciger C618 1 N373930452730282828192424484254413834251Danciger C618
Mustang Bayou C619 1 N404129403432303027232926435057474435351Mustang Bayou C619
Texas City 34th St. C620 1 N39413041333229312526322646485751NVNANA1Texas City 34th St. C620
UH Moody Tower C6951 N3439NVNV23313131NVNV2928504172434137391UH Moody Tower C695
U of H-Sugarland C6961 N2932333927252424NV133124422952403831301U of H-Sugarland C696
UH Coastal Center C6971 N30302433252422NV19182420343347433730231UH Coastal Center C697
UH WG Jones Forest C6981 N334139372738413632212931462456414339331UH WG Jones Forest C698
UH West Liberty C6991 N4046373828383937342232306441NV50NVNV321UH West Liberty C699
Lynchburg Ferry C1015/A165 1343826292128292927142523423747434030261Lynchburg Ferry C1015/A165
Lake Jackson C1016 1353927413530272625172623NV46NANANV33201Lake Jackson C1016
Baytown Garth C10171384033352332313227203328524149504235351Baytown Garth C1017
Galveston 99th St. C1034/A320/X1831424132453837323427283232495357534842451Galveston 99th St. C1034/A320/X183
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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San Antonio
San Antonio Northwest C232393743413232383236382331413948343037272San Antonio Northwest C23
Camp Bullis C581424043413033423340401928423951362836251Camp Bullis C58
Calaveras Lake C591353338372431332932332126393843313229251Calaveras Lake C59
Elm Creek Elementary C5011 N353339382628353033322026413642322631221Elm Creek Elementary C501
Fair Oaks Ranch C5021 N40384038303140313734202840NANANANANANA1Fair Oaks Ranch C502
Bulverde Elementary C5031 N38384037NVNANANV3835202840NVNANANANANA1Bulverde Elementary C503
New Braunfels Airport C5041 N363340372435383134291827453646343632271New Braunfels Airport C504
City of Garden Ridge C5051 N403644412534373135332229453951363335261City of Garden Ridge C505
Seguin Outdoor Learning Center C5061 N353439362336363033281927443442313530241Seguin Outdoor Learning Center C506
Heritage Middle School C6221 N363439372532333033342328424044343330251Heritage Middle School C622
CPS Pecan Valley C6781 N3432363523NV322730281924373540292626201CPS Pecan Valley C678
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Corpus Christi-Victoria
Corpus Christi West C42373432442929272727293031404751353439312Corpus Christi West C4
Corpus Christi Tuloso C211343232422930272827272833NV4047333038311Corpus Christi Tuloso C21
Victoria C871363239402929272626322328393452334043211Victoria C87
Inez C6091 NNANANANANANANANANANANANANANANANANVNANA1Inez C609
Coleto C6241 NNANANANANANANANANANANANANANV50354243261Coleto C624
Aransas Pass C6591 N373632483329262727293136435155412944351Aransas Pass C659
Holly Road C6601 N33NVNANANA23212323262526344345262834251Holly Road C660
Violet C6641 N302827372526222422212632384145303339281Violet C664
Ingleside C6851 N343228422826232423242633364247312741281Ingleside C685
Odem C6861 N333128392628252624262531383845312738281Odem C686
Taft C6871 N32302537252322222224243038384633NVNANA1Taft C687
Cuero C16021 NNANANANANANANANANV252425423245323634271Cuero C1602
AreaMonitoring SitePOCApril 2015POCMonitoring Site
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Lower Rio Grande Valley
Mission C43/AP1431302930262729272927292836323840252337261Mission C43/AP143
Brownsville C80/AGP1801323024242628242523242438334946201838181Brownsville C80/AGP180
Harlingen Teege C10231313024282730272726292535344948232337191Harlingen Teege C1023
AreaMonitoring SitePOCApril 2015POCMonitoring Site
12345678910111213141516171819
Laredo
Laredo Vidaurri C44/AFGP144/P2441313337362724303029272322302836282229111Laredo 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 - 0.059
51 - 100 Not Defined 0.06 - 0.075
101 - 150 0.125 - 0.164 0.076 - 0.095
151 - 200 0.165 - 0.204 0.096 - 0.115
201 - 300 0.205 - 0.404 0.116 - 0.374
301 - 400 0.405 - 0.504 Not Defined
401 - 500 0.505 - 0.604 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 beginning 1/1/2013, 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.