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Eight-Hour Ozone High Value Days for 2018
as of December 18

The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 71 parts per billion in 2018 in each community where the TCEQ measures ozone. This information is updated hourly. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) Times shown are in 24-hour format and are Local Standard Time. Our convention is that the time reflects the beginning of the eight-hour average. All ozone measurements are in parts per billion.

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YearSort ByReport Format
Highlight with AQI colors
2018 Sorted by Maximum Value
LocationRegionCAMSAQSDateTimeValuePOC
Houston Aldine C8/AF108/X150 12 848_201_0024July 27 201811:001092
Galveston 99th St. C1034/A320/X183 12 103448_167_1034July 26 201811:001071
Lang C408 12 40848_201_0047July 27 201811:001002
UH Moody Tower C695 12 69548_201_0695August 23 201811:001001 N
Clinton C403/C304/AH113 12 40348_201_1035August 23 201811:00993
Northwest Harris Co. C26/A110/X154 12 2648_201_0029July 27 201812:00982
Texas City 34th St. C620 12 62048_167_0056August 1 201810:00961 N
Houston East C1/G316 12 148_201_1034July 27 201812:00942
Oyster Creek C1607 12 160748_039_1607August 1 201811:00931 N
UH Smith Point C1606 12 160648_071_1606September 18 201810:00931 N
UH Moody Tower C695 12 69548_201_0695July 27 201810:00931 N
Manvel Croix Park C84 12 8448_039_1004July 26 201810:00921
Eagle Mountain Lake C75 4 7548_439_0075May 17 201811:00921
Grapevine Fairway C70/A301/X182 4 7048_439_3009July 25 201811:00921
El Paso UTEP C12/A125/X151/G125 6 1248_141_0037July 29 201811:00912
Houston Aldine C8/AF108/X150 12 848_201_0024August 24 201810:00912
HRM-3 Haden Road C603/A114 12 60348_201_0803July 27 201810:00911 N
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039July 27 201810:00911
Parker County C76 4 7648_367_0081August 22 201812:00911
Keller C17 4 1748_439_2003July 25 201812:00912
Dallas North No.2 C63/C679 4 6348_113_0075July 26 201810:00901
Houston North Wayside C405 12 40548_201_0046July 27 201811:00901
Lang C408 12 40848_201_0047August 23 201811:00902
Park Place C416 12 41648_201_0416August 23 201811:00901
UH WG Jones Forest C698 12 69848_339_0698August 24 201812:00901 N
Atascocita C560 12 56048_201_0560July 27 201811:00891 N
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039September 18 201809:00891
Grapevine Fairway C70/A301/X182 4 7048_439_3009May 26 201811:00891
Texas City 34th St. C620 12 62048_167_0056April 24 201811:00881 N
Houston Aldine C8/AF108/X150 12 848_201_0024April 28 201811:00882
Houston Aldine C8/AF108/X150 12 848_201_0024May 7 201810:00882
Wallisville Road C617 12 61748_201_0617May 7 201811:00881 N
Baytown Garth C1017 12 101748_201_1017May 7 201811:00881
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039September 17 201811:00881
Seabrook Friendship Park C45 12 4548_201_1050July 27 201810:00881
Cleburne Airport C77/C682 4 7748_251_0003August 21 201812:00881
Conroe Relocated C78/A321 12 7848_339_0078August 24 201812:00881
Ivanhoe C414/F514 6 41448_141_0029August 4 201810:00871
Chamizal C41/AH126 6 4148_141_0044August 4 201810:00871
Texas City 34th St. C620 12 62048_167_0056July 27 201810:00871 N
Channelview C15/AH115 12 1548_201_0026July 27 201810:00873
Crosby Library C553 12 55348_201_0553August 24 201810:00871 N
Wallisville Road C617 12 61748_201_0617August 24 201810:00871 N
Greenville C1006/A198 4 100648_231_1006July 27 201811:00871
SETRPC 43 Jefferson Co Airport C643 10 64348_245_0102July 27 201810:00871
Denton Airport South C56/A163/X157 4 5648_121_0034July 25 201811:00861
El Paso UTEP C12/A125/X151/G125 6 1248_141_0037August 4 201811:00862
Chamizal C41/AH126 6 4148_141_0044July 29 201811:00861
Houston Aldine C8/AF108/X150 12 848_201_0024July 28 201810:00862
Park Place C416 12 41648_201_0416July 27 201810:00861
Crosby Library C553 12 55348_201_0553April 28 201811:00861 N
Lynchburg Ferry C1015/A165 12 101548_201_1015July 27 201810:00861
Houston East C1/G316 12 148_201_1034August 23 201810:00862
Seabrook Friendship Park C45 12 4548_201_1050September 17 201811:00861
Frisco C31/C680 4 3148_085_0005July 28 201810:00851
Dallas North No.2 C63/C679 4 6348_113_0075June 21 201811:00851
Lang C408 12 40848_201_0047April 28 201810:00852
Crosby Library C553 12 55348_201_0553April 25 201809:00851 N
Atascocita C560 12 56048_201_0560May 7 201811:00851 N
Atascocita C560 12 56048_201_0560July 28 201811:00851 N
Baytown Garth C1017 12 101748_201_1017May 17 201810:00851
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039July 26 201810:00851
Conroe Relocated C78/A321 12 7848_339_0078May 15 201810:00851
UH WG Jones Forest C698 12 69848_339_0698July 28 201812:00851 N
Keller C17 4 1748_439_2003May 17 201811:00852
UH Smith Point C1606 12 160648_071_1606September 17 201810:00841 N
Frisco C31/C680 4 3148_085_0005July 26 201812:00841
Skyline Park C72 6 7248_141_0058August 4 201811:00841
Houston Croquet C409 12 40948_201_0051July 26 201811:00842
UH Moody Tower C695 12 69548_201_0695May 7 201810:00841 N
Baytown Garth C1017 12 101748_201_1017August 24 201810:00841
Houston East C1/G316 12 148_201_1034May 7 201811:00842
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039May 7 201810:00841
Seabrook Friendship Park C45 12 4548_201_1050April 24 201812:00841
CAPCOG San Marcos Staples Road C1675 11 167548_209_1675August 1 201811:00841 N
Eagle Mountain Lake C75 4 7548_439_0075August 2 201812:00841
Eagle Mountain Lake C75 4 7548_439_0075August 3 201810:00841
San Antonio Northwest C23 13 2348_029_0032August 2 201811:00832
Camp Bullis C58 13 5848_029_0052May 7 201809:00831
Camp Bullis C58 13 5848_029_0052August 2 201811:00831
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069June 21 201811:00833
Dallas North No.2 C63/C679 4 6348_113_0075May 26 201811:00831
Chamizal C41/AH126 6 4148_141_0044June 4 201811:00831
Skyline Park C72 6 7248_141_0058July 25 201809:00831
Galveston 99th St. C1034/A320/X183 12 103448_167_1034April 24 201812:00831
Galveston 99th St. C1034/A320/X183 12 103448_167_1034May 7 201811:00831
Northwest Harris Co. C26/A110/X154 12 2648_201_0029April 28 201811:00832
UH Moody Tower C695 12 69548_201_0695July 26 201809:00831 N
Lynchburg Ferry C1015/A165 12 101548_201_1015May 7 201811:00831
Beaumont-Downtown C2/A112/C2002 10 248_245_0009July 27 201810:00832
Cleburne Airport C77/C682 4 7748_251_0003July 23 201811:00831
Cleburne Airport C77/C682 4 7748_251_0003July 24 201812:00831
Ft. Worth Northwest C13/AH302 4 1348_439_1002May 17 201811:00832
Keller C17 4 1748_439_2003August 2 201812:00832
Grapevine Fairway C70/A301/X182 4 7048_439_3009August 2 201811:00831
Ivanhoe C414/F514 6 41448_141_0029July 25 201810:00821
El Paso UTEP C12/A125/X151/G125 6 1248_141_0037June 4 201811:00822
Ascarate Park SE C37/A332/A172/X159 6 3748_141_0055June 4 201811:00821
Houston North Wayside C405 12 40548_201_0046April 28 201810:00821
Houston Bayland Park C53/A146 12 5348_201_0055August 23 201812:00821
Houston Monroe C406 12 40648_201_0062July 26 201810:00821
Crosby Library C553 12 55348_201_0553May 7 201811:00821 N
Crosby Library C553 12 55348_201_0553May 15 201810:00821 N
Crosby Library C553 12 55348_201_0553July 28 201810:00821 N
Wallisville Road C617 12 61748_201_0617May 17 201810:00821 N
Houston East C1/G316 12 148_201_1034April 28 201810:00822
Seabrook Friendship Park C45 12 4548_201_1050July 26 201809:00821
CAPCOG San Marcos Staples Road C1675 11 167548_209_1675August 2 201810:00821 N
Port Arthur West C28/A128/A228 10 2848_245_0011July 27 201809:00821
Conroe Relocated C78/A321 12 7848_339_0078July 28 201816:00821
Grapevine Fairway C70/A301/X182 4 7048_439_3009July 26 201812:00821
Gorzycki Middle School C1603 11 160348_453_1603August 2 201812:00821 N
Killeen Skylark Field C1047 9 104748_027_1047May 7 201811:00811
Frisco C31/C680 4 3148_085_0005May 7 201812:00811
Frisco C31/C680 4 3148_085_0005May 26 201811:00811
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069April 24 201811:00813
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069July 26 201811:00813
Dallas North No.2 C63/C679 4 6348_113_0075April 28 201812:00811
Dallas North No.2 C63/C679 4 6348_113_0075May 6 201812:00811
Dallas Executive Airport C402 4 40248_113_0087April 24 201811:00811
Denton Airport South C56/A163/X157 4 5648_121_0034August 2 201811:00811
Ascarate Park SE C37/A332/A172/X159 6 3748_141_0055August 4 201810:00811
Channelview C15/AH115 12 1548_201_0026April 28 201812:00813
Channelview C15/AH115 12 1548_201_0026May 7 201810:00813
Wallisville Road C617 12 61748_201_0617May 15 201809:00811 N
Wallisville Road C617 12 61748_201_0617July 23 201813:00811 N
Wallisville Road C617 12 61748_201_0617July 27 201810:00811 N
Baytown Garth C1017 12 101748_201_1017April 25 201809:00811
Baytown Garth C1017 12 101748_201_1017May 15 201809:00811
Baytown Garth C1017 12 101748_201_1017July 27 201810:00811
Cleburne Airport C77/C682 4 7748_251_0003May 16 201812:00811
Cleburne Airport C77/C682 4 7748_251_0003August 1 201811:00811
Rockwall Heath C69 4 6948_397_0001May 6 201811:00811
Ft. Worth Northwest C13/AH302 4 1348_439_1002July 25 201811:00812
Government Canyon C1610 13 161048_029_1610August 2 201811:00801 N
City of Garden Ridge C505 13 50548_091_0505August 2 201811:00801 N
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069July 25 201811:00803
Denton Airport South C56/A163/X157 4 5648_121_0034May 26 201811:00801
Pilot Point C1032 4 103248_121_1032August 23 201810:00801
Crosby Library C553 12 55348_201_0553July 27 201810:00801 N
Lynchburg Ferry C1015/A165 12 101548_201_1015September 18 201811:00801
Granbury C73/C681 4 7348_221_0001August 21 201812:00801
SETRPC Port Arthur C628 10 62848_245_0628July 27 201809:00801 N
UH West Liberty C699 12 69948_291_0699April 25 201809:00801 N
Gorzycki Middle School C1603 11 160348_453_1603July 31 201813:00801 N
Calaveras Lake C59 13 5948_029_0059August 1 201811:00791
Elm Creek Elementary C501 13 50148_029_0501August 2 201810:00791 N
Fair Oaks Ranch C502 13 50248_029_0502May 7 201811:00791 N
UH Smith Point C1606 12 160648_071_1606April 24 201810:00791 N
UH Smith Point C1606 12 160648_071_1606July 26 201810:00791 N
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069May 6 201811:00793
Dallas North No.2 C63/C679 4 6348_113_0075July 25 201811:00791
Skyline Park C72 6 7248_141_0058July 29 201811:00791
Houston Aldine C8/AF108/X150 12 848_201_0024September 18 201811:00792
Channelview C15/AH115 12 1548_201_0026September 18 201811:00793
Houston North Wayside C405 12 40548_201_0046May 7 201810:00791
Houston Bayland Park C53/A146 12 5348_201_0055April 28 201810:00791
Park Place C416 12 41648_201_0416July 26 201809:00791
HRM-3 Haden Road C603/A114 12 60348_201_0803May 7 201810:00791 N
UH West Liberty C699 12 69948_291_0699August 24 201810:00791 N
Rockwall Heath C69 4 6948_397_0001April 28 201811:00791
Manvel Croix Park C84 12 8448_039_1004August 2 201810:00781
UH Smith Point C1606 12 160648_071_1606July 27 201810:00781 N
Bulverde Elementary C503 13 50348_091_0503May 7 201811:00781 N
Bulverde Elementary C503 13 50348_091_0503August 2 201811:00781 N
Dallas Executive Airport C402 4 40248_113_0087June 21 201811:00781
Chamizal C41/AH126 6 4148_141_0044July 25 201810:00781
Texas City 34th St. C620 12 62048_167_0056September 17 201811:00781 N
Houston Aldine C8/AF108/X150 12 848_201_0024April 25 201810:00782
Channelview C15/AH115 12 1548_201_0026August 24 201810:00783
Houston Bayland Park C53/A146 12 5348_201_0055May 7 201811:00781
Crosby Library C553 12 55348_201_0553May 17 201810:00781 N
Wallisville Road C617 12 61748_201_0617April 25 201809:00781 N
UH Moody Tower C695 12 69548_201_0695April 28 201810:00781 N
HRM-3 Haden Road C603/A114 12 60348_201_0803April 28 201810:00781 N
Granbury C73/C681 4 7348_221_0001July 24 201810:00781
Greenville C1006/A198 4 100648_231_1006July 26 201811:00781
SETRPC Port Arthur C628 10 62848_245_0628July 26 201810:00781 N
Parker County C76 4 7648_367_0081August 2 201814:00781
Rockwall Heath C69 4 6948_397_0001June 21 201812:00781
Keller C17 4 1748_439_2003August 3 201810:00782
Grapevine Fairway C70/A301/X182 4 7048_439_3009August 3 201809:00781
Arlington Municipal Airport C61 4 6148_439_3011July 23 201809:00781
Camp Bullis C58 13 5848_029_0052April 23 201812:00771
Fair Oaks Ranch C502 13 50248_029_0502August 2 201811:00771 N
Government Canyon C1610 13 161048_029_1610July 27 201810:00771 N
Manvel Croix Park C84 12 8448_039_1004April 24 201811:00771
Lake Jackson C1016 12 101648_039_1016August 1 201813:00771
Dallas Executive Airport C402 4 40248_113_0087August 21 201811:00771
Skyline Park C72 6 7248_141_0058June 4 201811:00771
Texas City 34th St. C620 12 62048_167_0056July 26 201808:00771 N
Houston Aldine C8/AF108/X150 12 848_201_0024August 23 201811:00772
Northwest Harris Co. C26/A110/X154 12 2648_201_0029August 23 201813:00772
Northwest Harris Co. C26/A110/X154 12 2648_201_0029August 25 201810:00772
Houston Bayland Park C53/A146 12 5348_201_0055July 26 201809:00771
Houston Westhollow C410 12 41048_201_0066April 28 201810:00771
Houston Westhollow C410 12 41048_201_0066August 23 201810:00771
Park Place C416 12 41648_201_0416May 7 201811:00771
Tom Bass C558 12 55848_201_0558July 26 201811:00771 N
Atascocita C560 12 56048_201_0560April 25 201810:00771 N
Wallisville Road C617 12 61748_201_0617April 28 201810:00771 N
HRM-3 Haden Road C603/A114 12 60348_201_0803September 18 201811:00771 N
Baytown Garth C1017 12 101748_201_1017April 28 201811:00771
Houston East C1/G316 12 148_201_1034May 17 201811:00772
Seabrook Friendship Park C45 12 4548_201_1050September 18 201810:00771
Dripping Springs School C614 11 61448_209_0614August 2 201811:00771 N
Hamshire C64/C654 10 6448_245_0022May 17 201810:00771
SETRPC Port Arthur C628 10 62848_245_0628May 17 201808:00771 N
Kaufman C71/A304/X071 4 7148_257_0005August 20 201811:00771
UH WG Jones Forest C698 12 69848_339_0698May 15 201812:00771 N
UH WG Jones Forest C698 12 69848_339_0698September 19 201811:00771 N
West Orange C9/A141 10 948_361_1001July 27 201810:00772
SETRPC Mauriceville 42 C642/C311/C665 10 64248_361_1100April 25 201811:00771 N
SETRPC Mauriceville 42 C642/C311/C665 10 64248_361_1100April 28 201811:00771 N
Arlington Municipal Airport C61 4 6148_439_3011April 24 201812:00771
Arlington Municipal Airport C61 4 6148_439_3011June 21 201812:00771
CAPCOG Lake Georgetown C690 11 69048_491_0690May 7 201810:00771 N
CPS Pecan Valley C678 13 67848_029_0055August 1 201810:00761 N
CPS Pecan Valley C678 13 67848_029_0055August 2 201810:00761 N
Elm Creek Elementary C501 13 50148_029_0501August 1 201811:00761 N
Frisco C31/C680 4 3148_085_0005June 21 201813:00761
City of Garden Ridge C505 13 50548_091_0505July 23 201811:00761 N
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069April 28 201811:00763
Dallas North No.2 C63/C679 4 6348_113_0075May 7 201811:00761
Dallas North No.2 C63/C679 4 6348_113_0075July 28 201811:00761
Denton Airport South C56/A163/X157 4 5648_121_0034August 3 201810:00761
Pilot Point C1032 4 103248_121_1032August 2 201810:00761
Italy C1044/A323 4 104448_139_1044August 21 201812:00761
El Paso UTEP C12/A125/X151/G125 6 1248_141_0037July 25 201809:00762
Skyline Park C72 6 7248_141_0058June 21 201811:00761
Skyline Park C72 6 7248_141_0058August 1 201810:00761
Galveston 99th St. C1034/A320/X183 12 103448_167_1034April 27 201812:00761
Houston Westhollow C410 12 41048_201_0066August 3 201809:00761
Atascocita C560 12 56048_201_0560May 15 201810:00761 N
Wallisville Road C617 12 61748_201_0617September 18 201811:00761 N
HRM-3 Haden Road C603/A114 12 60348_201_0803August 24 201808:00761 N
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039April 24 201812:00761
Seabrook Friendship Park C45 12 4548_201_1050August 1 201810:00761
CAPCOG San Marcos Staples Road C1675 11 167548_209_1675July 31 201811:00761 N
SETRPC 40 Sabine Pass C640/C1654 10 64048_245_0101April 25 201811:00761
Nederland High School C1035 10 103548_245_1035July 27 201810:00761
UH WG Jones Forest C698 12 69848_339_0698June 8 201810:00761 N
UH WG Jones Forest C698 12 69848_339_0698July 27 201812:00761 N
Rockwall Heath C69 4 6948_397_0001May 7 201811:00761
Ft. Worth Northwest C13/AH302 4 1348_439_1002April 24 201812:00762
Ft. Worth Northwest C13/AH302 4 1348_439_1002July 23 201810:00762
Keller C17 4 1748_439_2003April 24 201812:00762
Arlington Municipal Airport C61 4 6148_439_3011August 22 201811:00761
Temple Georgia C1045 9 104548_027_1045May 7 201811:00751
Killeen Skylark Field C1047 9 104748_027_1047April 28 201810:00751
Killeen Skylark Field C1047 9 104748_027_1047August 2 201811:00751
San Antonio Northwest C23 13 2348_029_0032May 7 201810:00752
Elm Creek Elementary C501 13 50148_029_0501July 24 201810:00751 N
Heritage Middle School C622 13 62248_029_0622August 1 201811:00751 N
Frisco C31/C680 4 3148_085_0005April 28 201812:00751
City of Garden Ridge C505 13 50548_091_0505May 7 201810:00751 N
Dallas North No.2 C63/C679 4 6348_113_0075April 24 201811:00751
Dallas North No.2 C63/C679 4 6348_113_0075July 27 201810:00751
Dallas Executive Airport C402 4 40248_113_0087April 28 201811:00751
Pilot Point C1032 4 103248_121_1032July 25 201812:00751
Ascarate Park SE C37/A332/A172/X159 6 3748_141_0055July 25 201810:00751
Ascarate Park SE C37/A332/A172/X159 6 3748_141_0055July 29 201810:00751
Socorro Hueco C49/F312 6 4948_141_0057July 25 201811:00751
Skyline Park C72 6 7248_141_0058June 27 201810:00751
Fayette County C601 11 60148_149_0001August 3 201811:00752 N
Houston Aldine C8/AF108/X150 12 848_201_0024May 17 201812:00752
Houston Aldine C8/AF108/X150 12 848_201_0024July 26 201809:00752
Beaumont-Downtown C2/A112/C2002 10 248_245_0009April 28 201811:00752
Port Arthur West C28/A128/A228 10 2848_245_0011July 26 201809:00751
SETRPC 43 Jefferson Co Airport C643 10 64348_245_0102July 26 201808:00751
Conroe Relocated C78/A321 12 7848_339_0078May 9 201811:00751
Conroe Relocated C78/A321 12 7848_339_0078May 14 201811:00751
UH WG Jones Forest C698 12 69848_339_0698April 28 201812:00751 N
West Orange C9/A141 10 948_361_1001April 25 201810:00752
Parker County C76 4 7648_367_0081May 17 201811:00751
Parker County C76 4 7648_367_0081August 3 201810:00751
Eagle Mountain Lake C75 4 7548_439_0075April 28 201811:00751
Ft. Worth Northwest C13/AH302 4 1348_439_1002June 21 201812:00752
Keller C17 4 1748_439_2003April 28 201811:00752
Keller C17 4 1748_439_2003July 26 201812:00752
Grapevine Fairway C70/A301/X182 4 7048_439_3009July 28 201810:00751
Arlington Municipal Airport C61 4 6148_439_3011August 21 201811:00751
Austin Northwest C3/A322 11 348_453_0014August 2 201810:00752
Pilot Point C1032 4 103248_121_1032May 29 201811:00741
Pilot Point C1032 4 103248_121_1032July 28 201811:00741
Midlothian OFW C52/A137 4 5248_139_0016July 23 201810:00741
Ivanhoe C414/F514 6 41448_141_0029June 4 201811:00741
Ivanhoe C414/F514 6 41448_141_0029August 13 201811:00741
El Paso UTEP C12/A125/X151/G125 6 1248_141_0037July 21 201810:00742
Texas City 34th St. C620 12 62048_167_0056May 7 201810:00741 N
Texas City 34th St. C620 12 62048_167_0056August 22 201812:00741 N
Houston Aldine C8/AF108/X150 12 848_201_0024August 25 201809:00742
Lang C408 12 40848_201_0047July 26 201809:00742
Houston Bayland Park C53/A146 12 5348_201_0055August 2 201809:00741
Houston Monroe C406 12 40648_201_0062July 27 201810:00741
UH Moody Tower C695 12 69548_201_0695April 25 201810:00741 N
Lynchburg Ferry C1015/A165 12 101548_201_1015September 16 201810:00741
Baytown Garth C1017 12 101748_201_1017September 18 201811:00741
CAPCOG San Marcos Staples Road C1675 11 167548_209_1675July 26 201810:00741 N
Granbury C73/C681 4 7348_221_0001August 22 201812:00741
Greenville C1006/A198 4 100648_231_1006July 21 201811:00741
SETRPC 40 Sabine Pass C640/C1654 10 64048_245_0101July 26 201810:00741
Conroe Relocated C78/A321 12 7848_339_0078July 27 201811:00741
UH WG Jones Forest C698 12 69848_339_0698May 8 201811:00741 N
Tyler Airport Relocated C82 5 8248_423_0007July 28 201812:00741
Eagle Mountain Lake C75 4 7548_439_0075April 24 201811:00741
Keller C17 4 1748_439_2003June 21 201813:00742
Grapevine Fairway C70/A301/X182 4 7048_439_3009April 24 201811:00741
Grapevine Fairway C70/A301/X182 4 7048_439_3009May 7 201811:00741
Arlington Municipal Airport C61 4 6148_439_3011May 26 201810:00741
Austin Northwest C3/A322 11 348_453_0014July 25 201811:00742
Audubon C38 11 3848_453_0020August 2 201809:00741
Gorzycki Middle School C1603 11 160348_453_1603July 25 201809:00741 N
Victoria C87 14 8748_469_0003August 1 201811:00741
San Antonio Northwest C23 13 2348_029_0032April 23 201812:00732
Camp Bullis C58 13 5848_029_0052July 26 201810:00731
Calaveras Lake C59 13 5948_029_0059August 2 201811:00731
Heritage Middle School C622 13 62248_029_0622May 6 201811:00731 N
Government Canyon C1610 13 161048_029_1610August 3 201810:00731 N
UH Smith Point C1606 12 160648_071_1606April 23 201811:00731 N
UH Smith Point C1606 12 160648_071_1606April 25 201808:00731 N
UH Smith Point C1606 12 160648_071_1606May 7 201811:00731 N
UH Smith Point C1606 12 160648_071_1606August 1 201809:00731 N
Frisco C31/C680 4 3148_085_0005July 20 201810:00731
Frisco C31/C680 4 3148_085_0005July 25 201810:00731
Frisco C31/C680 4 3148_085_0005August 23 201810:00731
City of Garden Ridge C505 13 50548_091_0505May 16 201811:00731 N
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069May 26 201811:00733
Dallas Executive Airport C402 4 40248_113_0087May 6 201811:00731
Dallas Executive Airport C402 4 40248_113_0087July 23 201810:00731
Pilot Point C1032 4 103248_121_1032August 24 201811:00731
Midlothian OFW C52/A137 4 5248_139_0016April 24 201812:00731
Chamizal C41/AH126 6 4148_141_0044June 21 201811:00731
Socorro Hueco C49/F312 6 4948_141_0057August 13 201811:00731
Texas City 34th St. C620 12 62048_167_0056August 2 201813:00731 N
Galveston 99th St. C1034/A320/X183 12 103448_167_1034August 22 201812:00731
Channelview C15/AH115 12 1548_201_0026May 15 201810:00733
Northwest Harris Co. C26/A110/X154 12 2648_201_0029August 24 201811:00732
Lang C408 12 40848_201_0047May 7 201811:00732
Houston Croquet C409 12 40948_201_0051July 24 201812:00732
Houston Bayland Park C53/A146 12 5348_201_0055April 25 201810:00731
Houston Bayland Park C53/A146 12 5348_201_0055August 3 201809:00731
Park Place C416 12 41648_201_0416April 28 201810:00731
Wallisville Road C617 12 61748_201_0617September 16 201810:00731 N
UH Moody Tower C695 12 69548_201_0695August 3 201809:00731 N
Houston East C1/G316 12 148_201_1034April 25 201810:00732
Clinton C403/C304/AH113 12 40348_201_1035April 28 201810:00733
Clinton C403/C304/AH113 12 40348_201_1035May 7 201811:00733
Greenville C1006/A198 4 100648_231_1006May 7 201810:00731
SETRPC 43 Jefferson Co Airport C643 10 64348_245_0102April 28 201811:00731
Nederland High School C1035 10 103548_245_1035April 28 201812:00731
Conroe Relocated C78/A321 12 7848_339_0078May 10 201810:00731
Conroe Relocated C78/A321 12 7848_339_0078June 8 201811:00731
UH WG Jones Forest C698 12 69848_339_0698May 9 201810:00731 N
Corsicana Airport C1051 4 105148_349_1051August 20 201813:00731
West Orange C9/A141 10 948_361_1001May 8 201810:00732
West Orange C9/A141 10 948_361_1001May 16 201811:00732
West Orange C9/A141 10 948_361_1001July 28 201809:00732
Tyler Airport Relocated C82 5 8248_423_0007April 28 201810:00731
Eagle Mountain Lake C75 4 7548_439_0075June 21 201811:00731
Eagle Mountain Lake C75 4 7548_439_0075August 22 201810:00731
Keller C17 4 1748_439_2003May 26 201811:00732
Keller C17 4 1748_439_2003July 27 201810:00732
Grapevine Fairway C70/A301/X182 4 7048_439_3009April 28 201812:00731
Grapevine Fairway C70/A301/X182 4 7048_439_3009May 17 201811:00731
Arlington Municipal Airport C61 4 6148_439_3011August 1 201811:00731
Gorzycki Middle School C1603 11 160348_453_1603August 1 201810:00731 N
CAPCOG Lake Georgetown C690 11 69048_491_0690April 28 201810:00731 N
CAPCOG Lake Georgetown C690 11 69048_491_0690August 2 201810:00731 N
Killeen Skylark Field C1047 9 104748_027_1047August 3 201810:00721
San Antonio Northwest C23 13 2348_029_0032July 26 201810:00722
San Antonio Northwest C23 13 2348_029_0032July 27 201809:00722
Camp Bullis C58 13 5848_029_0052April 24 201811:00721
Camp Bullis C58 13 5848_029_0052April 28 201810:00721
Fair Oaks Ranch C502 13 50248_029_0502April 28 201810:00721 N
Danciger C618 12 61848_039_0618August 2 201809:00721 N
Frisco C31/C680 4 3148_085_0005July 19 201810:00721
Frisco C31/C680 4 3148_085_0005July 27 201810:00721
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069August 2 201811:00723
Dallas Executive Airport C402 4 40248_113_0087May 7 201811:00721
Dallas Executive Airport C402 4 40248_113_0087August 20 201811:00721
Denton Airport South C56/A163/X157 4 5648_121_0034May 29 201810:00721
Pilot Point C1032 4 103248_121_1032May 7 201811:00721
Pilot Point C1032 4 103248_121_1032July 26 201813:00721
Midlothian OFW C52/A137 4 5248_139_0016August 21 201812:00721
Italy C1044/A323 4 104448_139_1044May 16 201812:00721
El Paso UTEP C12/A125/X151/G125 6 1248_141_0037June 21 201810:00722
Skyline Park C72 6 7248_141_0058June 26 201810:00721
Galveston 99th St. C1034/A320/X183 12 103448_167_1034April 28 201811:00721
Galveston 99th St. C1034/A320/X183 12 103448_167_1034August 1 201810:00721
Houston Aldine C8/AF108/X150 12 848_201_0024April 29 201810:00722
Houston Aldine C8/AF108/X150 12 848_201_0024June 8 201809:00722
Channelview C15/AH115 12 1548_201_0026May 17 201810:00723
Northwest Harris Co. C26/A110/X154 12 2648_201_0029April 29 201810:00722
Lang C408 12 40848_201_0047April 25 201809:00722
Park Place C416 12 41648_201_0416April 24 201812:00721
Park Place C416 12 41648_201_0416July 25 201809:00721
Crosby Library C553 12 55348_201_0553May 8 201811:00721 N
Crosby Library C553 12 55348_201_0553May 16 201811:00721 N
Atascocita C560 12 56048_201_0560May 17 201811:00721 N
UH Moody Tower C695 12 69548_201_0695April 24 201811:00721 N
CAPCOG San Marcos Staples Road C1675 11 167548_209_1675July 23 201811:00721 N
CAPCOG San Marcos Staples Road C1675 11 167548_209_1675August 3 201810:00721 N
Hamshire C64/C654 10 6448_245_0022April 25 201809:00721
SETRPC 43 Jefferson Co Airport C643 10 64348_245_0102May 15 201809:00721
Cleburne Airport C77/C682 4 7748_251_0003August 2 201812:00721
UH West Liberty C699 12 69948_291_0699May 15 201810:00721 N
Conroe Relocated C78/A321 12 7848_339_0078May 29 201811:00721
Conroe Relocated C78/A321 12 7848_339_0078July 26 201808:00721
Corsicana Airport C1051 4 105148_349_1051April 28 201810:00721
West Orange C9/A141 10 948_361_1001April 28 201810:00722
SETRPC Mauriceville 42 C642/C311/C665 10 64248_361_1100May 8 201811:00721 N
SETRPC Mauriceville 42 C642/C311/C665 10 64248_361_1100May 16 201812:00721 N
Parker County C76 4 7648_367_0081April 24 201812:00721
Parker County C76 4 7648_367_0081July 25 201812:00721
Ft. Worth Northwest C13/AH302 4 1348_439_1002May 26 201811:00722
Keller C17 4 1748_439_2003July 23 201809:00722
Keller C17 4 1748_439_2003July 30 201813:00722
Grapevine Fairway C70/A301/X182 4 7048_439_3009July 27 201810:00721
Arlington Municipal Airport C61 4 6148_439_3011August 2 201811:00721
Austin Northwest C3/A322 11 348_453_0014May 7 201810:00722
Austin Northwest C3/A322 11 348_453_0014July 31 201812:00722
Gorzycki Middle School C1603 11 160348_453_1603July 26 201811:00721 N
Gorzycki Middle School C1603 11 160348_453_1603August 3 201810:00721 N
Temple Georgia C1045 9 104548_027_1045April 28 201809:00711
Killeen Skylark Field C1047 9 104748_027_1047May 8 201811:00711
Camp Bullis C58 13 5848_029_0052August 3 201810:00711
CPS Pecan Valley C678 13 67848_029_0055May 6 201810:00711 N
Calaveras Lake C59 13 5948_029_0059May 6 201811:00711
Calaveras Lake C59 13 5948_029_0059May 7 201811:00711
Elm Creek Elementary C501 13 50148_029_0501July 26 201811:00711 N
Fair Oaks Ranch C502 13 50248_029_0502August 3 201810:00711 N
Government Canyon C1610 13 161048_029_1610July 26 201811:00711 N
Manvel Croix Park C84 12 8448_039_1004July 25 201810:00711
UH Smith Point C1606 12 160648_071_1606April 28 201811:00711 N
UH Smith Point C1606 12 160648_071_1606August 2 201813:00711 N
Frisco C31/C680 4 3148_085_0005April 24 201811:00711
Frisco C31/C680 4 3148_085_0005May 8 201811:00711
Frisco C31/C680 4 3148_085_0005May 29 201810:00711
Frisco C31/C680 4 3148_085_0005July 22 201811:00711
Frisco C31/C680 4 3148_085_0005August 24 201810:00711
City of Garden Ridge C505 13 50548_091_0505April 23 201812:00711 N
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069May 7 201811:00713
Denton Airport South C56/A163/X157 4 5648_121_0034April 28 201811:00711
Denton Airport South C56/A163/X157 4 5648_121_0034June 5 201810:00711
Denton Airport South C56/A163/X157 4 5648_121_0034July 26 201811:00711
Pilot Point C1032 4 103248_121_1032May 8 201811:00711
Pilot Point C1032 4 103248_121_1032May 18 201810:00711
Italy C1044/A323 4 104448_139_1044May 7 201810:00711
Ivanhoe C414/F514 6 41448_141_0029August 3 201810:00711
El Paso UTEP C12/A125/X151/G125 6 1248_141_0037August 30 201810:00712
Chamizal C41/AH126 6 4148_141_0044July 21 201810:00711
Socorro Hueco C49/F312 6 4948_141_0057August 4 201810:00711
Skyline Park C72 6 7248_141_0058May 22 201810:00711
Skyline Park C72 6 7248_141_0058July 21 201810:00711
Skyline Park C72 6 7248_141_0058August 13 201810:00711
Skyline Park C72 6 7248_141_0058August 30 201810:00711
Skyline Park C72 6 7248_141_0058September 9 201811:00711
Texas City 34th St. C620 12 62048_167_0056April 27 201812:00711 N
Texas City 34th St. C620 12 62048_167_0056September 18 201811:00711 N
Galveston 99th St. C1034/A320/X183 12 103448_167_1034April 26 201812:00711
Galveston 99th St. C1034/A320/X183 12 103448_167_1034July 27 201810:00711
Houston Aldine C8/AF108/X150 12 848_201_0024September 19 201811:00712
Channelview C15/AH115 12 1548_201_0026April 25 201809:00713
Channelview C15/AH115 12 1548_201_0026August 23 201810:00713
Northwest Harris Co. C26/A110/X154 12 2648_201_0029August 3 201811:00712
Lang C408 12 40848_201_0047August 25 201809:00712
Wallisville Road C617 12 61748_201_0617May 8 201810:00711 N
Wallisville Road C617 12 61748_201_0617July 28 201809:00711 N
Wallisville Road C617 12 61748_201_0617July 29 201809:00711 N
UH Moody Tower C695 12 69548_201_0695July 25 201809:00711 N
HRM-3 Haden Road C603/A114 12 60348_201_0803September 16 201809:00711 N
Lynchburg Ferry C1015/A165 12 101548_201_1015April 28 201811:00711
Baytown Garth C1017 12 101748_201_1017May 8 201810:00711
Baytown Garth C1017 12 101748_201_1017July 23 201811:00711
Baytown Garth C1017 12 101748_201_1017July 28 201809:00711
Houston East C1/G316 12 148_201_1034August 24 201810:00712
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039April 28 201810:00711
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039August 23 201811:00711
Dripping Springs School C614 11 61448_209_0614May 7 201811:00711 N
Dripping Springs School C614 11 61448_209_0614July 25 201811:00711 N
Granbury C73/C681 4 7348_221_0001August 1 201812:00711
Granbury C73/C681 4 7348_221_0001August 2 201812:00711
Beaumont-Downtown C2/A112/C2002 10 248_245_0009April 25 201810:00712
Port Arthur West C28/A128/A228 10 2848_245_0011August 23 201811:00711
Hamshire C64/C654 10 6448_245_0022August 23 201810:00711
SETRPC 40 Sabine Pass C640/C1654 10 64048_245_0101April 28 201811:00711
SETRPC 40 Sabine Pass C640/C1654 10 64048_245_0101July 27 201808:00711
SETRPC 43 Jefferson Co Airport C643 10 64348_245_0102April 25 201810:00711
SETRPC Port Arthur C628 10 62848_245_0628May 15 201809:00711 N
Cleburne Airport C77/C682 4 7748_251_0003April 24 201811:00711
Cleburne Airport C77/C682 4 7748_251_0003August 22 201812:00711
UH West Liberty C699 12 69948_291_0699April 28 201811:00711 N
Conroe Relocated C78/A321 12 7848_339_0078May 8 201811:00711
Rockwall Heath C69 4 6948_397_0001April 24 201811:00711
Keller C17 4 1748_439_2003July 28 201810:00712
Grapevine Fairway C70/A301/X182 4 7048_439_3009June 21 201812:00711
Austin Northwest C3/A322 11 348_453_0014July 26 201810:00712
Austin Northwest C3/A322 11 348_453_0014July 27 201810:00712
Gorzycki Middle School C1603 11 160348_453_1603May 7 201811:00711 N
Victoria C87 14 8748_469_0003August 2 201811:00711
CAPCOG Hutto College Street C6602 11 660248_491_6602May 7 201810:00711 N
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
 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.