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Peak Daily One-Hour Ozone Averages for July 2020

The table below lists the peak daily one-hour ozone concentrations measured in July 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 SitePOCJuly 2020
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 241348273656353414461
Keller C17240396375546951384261
Frisco C31/C680146535971476564545256
Midlothian OFW C52/A137135333243574337334131
Denton Airport South C56/A163/X157146506179487164505052
Arlington Municipal Airport C61140354556636042354246
Dallas North No.2 C63/C679140427667455860444349
Rockwall Heath C69130337351464539313637
Grapevine Fairway C70/A301/X182143417977557163474657
Kaufman C71/A304/X071134364049554234NANA31
Granbury C73/C681135323841645237374338
Eagle Mountain Lake C75 140426370575958424565
Parker County C761NA334244474648393957
Cleburne Airport C77/C682135283135534635384032
Dallas Hinton St. C401/C60/AH161 338386270556156384053
Dallas Executive Airport C402138414969624752394144
Greenville C1006/A198128335649483635293031
Pilot Point C1032152585459496155535748
Italy C1044/A323129413242393835303031
Corsicana Airport C1051131343245393432333740
AreaMonitoring SitePOCJuly 2020
Longview C19/A127/C644226284044362726232520
Tyler Airport Relocated C82125323841403527262726
Karnack C85/AFHP303129412646322724333827
AreaMonitoring SitePOCJuly 2020
El Paso-Juarez
El Paso UTEP C12/A125/X151/G125247424662616188595667
Ascarate Park SE C37/A332/A172/X159146404664555078565359
Chamizal C41/AH126 148424667565582565160
Socorro Hueco C49/F312154625868635566735855
Skyline Park C72151454368525966514964
Ivanhoe C414/F514152484868535275605158
AreaMonitoring SitePOCJuly 2020
Waco Mazanec C1037130524345374731333336
Temple Georgia C1045134484239404743433737
Killeen Skylark Field C1047143494738453941474549
AreaMonitoring SitePOCJuly 2020
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 222353641352518192534
West Orange C9/A141224303238351921202428
Port Arthur West C28/A128/A228121224349251415182117
Hamshire C64/C654120265043381717192329
SETRPC 40 Sabine Pass C640/C1654122245247271717182118
SETRPC Mauriceville 42 C642/C311/C6651 N31423145393535283948
SETRPC 43 Jefferson Co Airport C643122274459321918212524
Nederland High School C1035 122253550281917192427
AreaMonitoring SitePOCJuly 2020
Audubon C38130364343443034373341
Dripping Springs School C6141 N33374143453440393540
CAPCOG Lake Georgetown C6901 N37445351533736413951
Lockhart C16041 N27313033322626302931
St. Edwards University C16051 N24273843352828302829
CAPCOG Bastrop CAMS16121 N31312726302527322730
CAPCOG Elgin C16131 N30302732312429323034
CAPCOG East Austin C16191 N28313945383030323133
CAPCOG San Marcos Staples Road C16751 N283032373326NA323030
CAPCOG Hutto College Street C66021 N30355048463538343132
AreaMonitoring SitePOCJuly 2020
Houston East C1/G316224434761422420232843
Houston Aldine C8/AF108/X150 226443451333122273140
Channelview C15/AH115 322485275492223242838
Northwest Harris Co. C26/A110/X154228303635282826262943
Hou.DeerPrk2 C35/235/1001/AFH139FP239124344849442222242429
Seabrook Friendship Park C45119274447301720211923
Houston Bayland Park C53/A146 119262942281820NA1636
Conroe Relocated C78/A321137363942294328444849
Manvel Croix Park C84119253244291917192324
Clinton C403/C304/AH113 321334151372017192438
Houston North Wayside C405120443752322321212644
Houston Monroe C406119263947371818192224
Lang C408227343342292726302851
Houston Croquet C409219303245291919182025
Houston Westhollow C410121293536292121232639
Park Place C416121313850372119202631
Baytown Wetlands Center C5521 N18275666471720191823
Crosby Library C5531 N24534354442851555576
West Houston C5541 N20243332252220202332
La Porte Sylvan Beach C5561 N13174240251313151314
Mercer Arboretum C5571 N29323344252931313059
Tom Bass C5581 N19233449351917182424
Katy Park C5591 N20233325261919192124
Atascocita C5601 N21443048292520242750
Meyer Park C5611 N24323337242223263456
Bunker Hill Village C5621 N18263034212019212042
Huffman Wolf Road C5631 N35613851413931424054
HRM-3 Haden Road C603/A114 1 N21404461422220222637
Wallisville Road C617 1 N35496898693735592642
Texas City 34th St. C620 1 N22273649311919202221
UH Moody Tower C6951 N23423854382522232835
UH WG Jones Forest C6981 NNA363937263727354656
UH West Liberty C6991 N30493445383031353347
Lynchburg Ferry C1015/A165 122344871532023242327
Lake Jackson C1016 117201728221515161917
Baytown Garth C1017128425683562630292845
Galveston 99th St. C1034/A320/X183119202730221616171814
UH Smith Point C16061 N20273451201418202315
Oyster Creek C1607 1 N23282834342222232623
UH Launch Trailer C16111 N23423752362421232734
AreaMonitoring SitePOCJuly 2020
San Antonio
San Antonio Northwest C23233353740354134383142
Camp Bullis C58 144445252455142433852
Calaveras Lake C59129292731302626312933
Elm Creek Elementary C5011 N28292731282827293030
Fair Oaks Ranch C5021 N36394043384138383445
Bulverde Elementary C5031 N34374544404239393341
New Braunfels Airport C5041 N26272632302423282627
City of Garden Ridge C5051 N26293441382531342730
Seguin Outdoor Learning Center C5061 N25282734292322262626
Heritage Middle School C6221 N23282629262321272630
CPS Pecan Valley C6781 N25253136292526292428
Government Canyon C16101 N31322934323730333038
AreaMonitoring SitePOCJuly 2020
Corpus Christi-Victoria
Corpus Christi West C4220212123211616191919
Corpus Christi Tuloso C21122232427261919222122
Victoria C87123262934292019222122
AreaMonitoring SitePOCJuly 2020
Lower Rio Grande Valley
Mission C43/AP143129252732281821232821
Harlingen Teege C1023120202526201620191620
AreaMonitoring SitePOCJuly 2020
Laredo Vidaurri C44/AFGP144/P244130333136333130313736
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.