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Eight-Hour Ozone High Value Days for 2015
as of August 4

The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 76 parts per billion in 2015 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.

Use the selection boxes below to customize this report. You may select a different year, a different sorting order, or a different report format. Click on the Generate Report button once you have made your selections.

YearSort ByReport Format
Highlight with AQI colors
2015 Sorted by Maximum Value
LocationRegionCAMSAQSDateTimeValuePOC
Houston Aldine C8/AF108/X150 12 848_201_0024June 3 201510:001082
HRM-3 Haden Road C603/A114 12 60348_201_0803June 3 201510:001071 N
Houston East C1/G316 12 148_201_1034June 3 201510:001022
Houston East C1/G316 12 148_201_1034August 3 201510:001012
HRM-3 Haden Road C603/A114 12 60348_201_0803August 3 201510:00991 N
La Porte Sylvan Beach C556 12 55648_201_0556June 3 201511:00981 N
Clear Creek High School C571 12 57148_167_0571June 2 201509:00961 N
Texas City 34th St. C620 12 62048_167_0056June 2 201510:00951 N
Lang C408 12 40848_201_0047August 3 201510:00952
UH Moody Tower C695 12 69548_201_0695June 6 201511:00951 N
Grapevine Fairway C70/A301/X182 4 7048_439_3009August 3 201510:00941
Channelview C15/AH115 12 1548_201_0026June 3 201510:00933
Denton Airport South C56/A163/X157 4 5648_121_0034June 5 201511:00921
Galveston 99th St. C1034/A320/X183 12 103448_167_1034June 6 201512:00921
Seabrook Friendship Park C45 12 4548_201_1050June 2 201508:00921
Northwest Harris Co. C26/A110/X154 12 2648_201_0029June 4 201510:00912
Lang C408 12 40848_201_0047June 6 201510:00912
Clinton C403/C304/AH113 12 40348_201_1035August 3 201509:00913
Houston North Wayside C405 12 40548_201_0046August 3 201510:00901
La Porte Sylvan Beach C556 12 55648_201_0556June 2 201509:00901 N
Houston Aldine C8/AF108/X150 12 848_201_0024August 3 201512:00892
Lang C408 12 40848_201_0047June 3 201509:00892
Baytown Garth C1017 12 101748_201_1017June 3 201511:00891
Denton Airport South C56/A163/X157 4 5648_121_0034August 3 201511:00881
Houston North Wayside C405 12 40548_201_0046June 3 201510:00881
Manvel Croix Park C84 12 8448_039_1004August 2 201510:00871
Park Place C416 12 41648_201_0416June 6 201511:00871
Lynchburg Ferry C1015/A165 12 101548_201_1015June 3 201510:00871
Seabrook Friendship Park C45 12 4548_201_1050August 3 201509:00871
Houston Aldine C8/AF108/X150 12 848_201_0024June 7 201510:00862
Channelview C15/AH115 12 1548_201_0026August 3 201510:00863
Lang C408 12 40848_201_0047June 4 201510:00862
Manvel Croix Park C84 12 8448_039_1004June 1 201511:00851
Houston Texas Avenue C411 12 41148_201_0075June 6 201511:00851
La Porte Sylvan Beach C556 12 55648_201_0556August 3 201510:00851 N
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069July 30 201511:00843
Houston Aldine C8/AF108/X150 12 848_201_0024April 30 201511:00842
Clear Brook High School C570 12 57048_201_0570June 6 201511:00841 N
Baytown Garth C1017 12 101748_201_1017August 3 201510:00841
Houston East C1/G316 12 148_201_1034June 6 201511:00842
Clinton C403/C304/AH113 12 40348_201_1035June 6 201511:00843
Dallas North No.2 C63/C679 4 6348_113_0075August 3 201509:00831
Galveston 99th St. C1034/A320/X183 12 103448_167_1034June 2 201510:00831
Longview C19/A127/C644 5 1948_183_0001June 6 201511:00832
Clear Lake High School C572 12 57248_201_0572June 2 201509:00831 N
Seabrook Friendship Park C45 12 4548_201_1050June 3 201509:00831
UH WG Jones Forest C698 12 69848_339_0698June 7 201512:00831 N
Ft. Worth Northwest C13/AH302 4 1348_439_1002August 3 201510:00832
Frisco C31/C680 4 3148_085_0005August 3 201510:00821
Denton Airport South C56/A163/X157 4 5648_121_0034June 4 201510:00821
Channelview C15/AH115 12 1548_201_0026April 30 201510:00823
Northwest Harris Co. C26/A110/X154 12 2648_201_0029August 3 201511:00822
Sheldon C551 12 55148_201_0551June 3 201510:00821 N
Clear Brook High School C570 12 57048_201_0570June 2 201511:00821 N
HRM-3 Haden Road C603/A114 12 60348_201_0803June 6 201510:00821 N
Baytown Garth C1017 12 101748_201_1017April 30 201510:00821
Port Arthur West C28/A128/A228 10 2848_245_0011August 3 201509:00821
Rockwall Heath C69 4 6948_397_0001April 30 201511:00821
Dallas Hinton St. C401/C60/AH161 4 40148_113_0069August 3 201510:00813
El Paso UTEP C12/A125/X151 6 1248_141_0037June 17 201510:00812
Meyer Park C561 12 56148_201_0561June 3 201511:00811 N
UH Moody Tower C695 12 69548_201_0695May 1 201511:00811 N
HRM-3 Haden Road C603/A114 12 60348_201_0803April 30 201510:00811 N
Lynchburg Ferry C1015/A165 12 101548_201_1015August 3 201510:00811
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039June 3 201510:00811
UH WG Jones Forest C698 12 69848_339_0698May 2 201511:00811 N
Keller C17 4 1748_439_2003August 3 201510:00812
Camp Bullis C58 13 5848_029_0052August 3 201510:00801
Galveston 99th St. C1034/A320/X183 12 103448_167_1034May 1 201511:00801
Conroe Relocated C78/A321 12 7848_339_0078May 2 201511:00801
Parker County C76 4 7648_367_0081July 31 201509:00801
Camp Bullis C58 13 5848_029_0052May 1 201511:00791
Manvel Croix Park C84 12 8448_039_1004May 1 201510:00791
Manvel Croix Park C84 12 8448_039_1004June 2 201510:00791
Dallas North No.2 C63/C679 4 6348_113_0075April 30 201511:00791
Pilot Point C1032 4 103248_121_1032June 6 201511:00791
Texas City 34th St. C620 12 62048_167_0056June 3 201510:00791 N
Texas City 34th St. C620 12 62048_167_0056June 6 201510:00791 N
Clear Creek High School C571 12 57148_167_0571May 1 201511:00791 N
Houston Aldine C8/AF108/X150 12 848_201_0024May 1 201510:00792
Houston Croquet C409 12 40948_201_0051June 2 201510:00792
Houston Bayland Park C53/A146 12 5348_201_0055May 1 201511:00791
Houston Bayland Park C53/A146 12 5348_201_0055June 6 201510:00791
Sheldon C551 12 55148_201_0551August 3 201510:00791 N
Mercer Arboretum C557 12 55748_201_0557June 3 201511:00791 N
Meyer Park C561 12 56148_201_0561June 4 201511:00791 N
Clear Brook High School C570 12 57048_201_0570June 1 201511:00791 N
Lynchburg Ferry C1015/A165 12 101548_201_1015April 30 201510:00791
Houston East C1/G316 12 148_201_1034June 4 201509:00792
Parker County C76 4 7648_367_0081May 1 201510:00791
Ft. Worth Northwest C13/AH302 4 1348_439_1002July 31 201509:00792
Grapevine Fairway C70/A301/X182 4 7048_439_3009June 5 201510:00791
Denton Airport South C56/A163/X157 4 5648_121_0034June 6 201511:00781
Pilot Point C1032 4 103248_121_1032May 2 201510:00781
Pilot Point C1032 4 103248_121_1032June 4 201509:00781
Galveston 99th St. C1034/A320/X183 12 103448_167_1034August 2 201512:00781
Houston Aldine C8/AF108/X150 12 848_201_0024May 2 201510:00782
Northwest Harris Co. C26/A110/X154 12 2648_201_0029June 3 201511:00782
Houston Croquet C409 12 40948_201_0051May 1 201511:00782
Houston Bayland Park C53/A146 12 5348_201_0055June 2 201511:00781
West Houston C554 12 55448_201_0554June 6 201511:00781 N
La Porte Sylvan Beach C556 12 55648_201_0556June 6 201511:00781 N
Wallisville Road C617 12 61748_201_0617June 3 201510:00781 N
HRM-3 Haden Road C603/A114 12 60348_201_0803May 1 201511:00781 N
Houston East C1/G316 12 148_201_1034April 30 201510:00782
Houston East C1/G316 12 148_201_1034May 1 201511:00782
Eagle Mountain Lake C75 4 7548_439_0075June 5 201510:00781
Eagle Mountain Lake C75 4 7548_439_0075August 3 201511:00781
Ft. Worth Northwest C13/AH302 4 1348_439_1002July 30 201512:00782
San Antonio Northwest C23 13 2348_029_0032May 2 201510:00772
Frisco C31/C680 4 3148_085_0005May 2 201510:00771
Denton Airport South C56/A163/X157 4 5648_121_0034May 1 201511:00771
Denton Airport South C56/A163/X157 4 5648_121_0034August 1 201510:00771
El Paso UTEP C12/A125/X151 6 1248_141_0037June 21 201511:00772
Texas City 34th St. C620 12 62048_167_0056May 1 201510:00771 N
Texas City 34th St. C620 12 62048_167_0056August 3 201508:00771 N
Clear Creek High School C571 12 57148_167_0571June 3 201511:00771 N
Houston Monroe C406 12 40648_201_0062June 6 201510:00771
Park Place C416 12 41648_201_0416May 1 201511:00771
Clear Brook High School C570 12 57048_201_0570May 1 201511:00771 N
UH Moody Tower C695 12 69548_201_0695June 2 201511:00771 N
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039May 1 201511:00771
Nederland High School C1035 10 103548_245_1035August 2 201510:00771
Nederland High School C1035 10 103548_245_1035August 3 201509:00771
Eagle Mountain Lake C75 4 7548_439_0075May 1 201510:00771
San Antonio Northwest C23 13 2348_029_0032August 3 201510:00762
Fair Oaks Ranch C502 13 50248_029_0502May 1 201511:00761 N
City of Garden Ridge C505 13 50548_091_0505April 30 201511:00761 N
Dallas North No.2 C63/C679 4 6348_113_0075June 28 201512:00761
Skyline Park C72 6 7248_141_0058July 1 201512:00761
Galveston 99th St. C1034/A320/X183 12 103448_167_1034July 31 201516:00761
Lang C408 12 40848_201_0047May 1 201511:00762
Houston Croquet C409 12 40948_201_0051August 2 201510:00762
Houston Texas Avenue C411 12 41148_201_0075August 3 201509:00761
UH Moody Tower C695 12 69548_201_0695April 30 201511:00761 N
UH Moody Tower C695 12 69548_201_0695June 3 201509:00761 N
UH Moody Tower C695 12 69548_201_0695June 4 201510:00761 N
UH Moody Tower C695 12 69548_201_0695August 3 201509:00761 N
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039August 3 201510:00761
Granbury C73/C681 4 7348_221_0001July 31 201511:00761
Port Arthur West C28/A128/A228 10 2848_245_0011August 2 201509:00761
Keller C17 4 1748_439_2003May 1 201511:00762
Keller C17 4 1748_439_2003June 5 201510:00762
Grapevine Fairway C70/A301/X182 4 7048_439_3009May 1 201511:00761
Arlington Municipal Airport C61 4 6148_439_3011July 30 201512:00761
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 - 0.059
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.