Eight-Hour Ozone High Value Days for 2012
as of May 21

The table below lists the daily maximum eight-hour ozone concentrations measured which exceed 75 parts per billion in 2012 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
2012 Sorted by Maximum Value
LocationRegionCAMSAQSDateTimeValuePOC
Seabrook Friendship Park C45124548_201_1050March 24 201211:001131
La Porte Sylvan Beach C5561255648_201_0556March 24 201211:001091 N
Clear Lake High School C5721257248_201_0572March 24 201211:001051 N
Hou.DeerPrk2 C35/235/1001/AFH139FP239123548_201_1039March 24 201211:001031
Houston East C1/G31612148_201_1034March 24 201211:00982
UH WG Jones Forest C6981269848_339_0698March 26 201212:00971 N
UH Coastal Center C6971269748_167_0697March 24 201212:00951 N
Seabrook Friendship Park C45124548_201_1050March 25 201211:00951
UH Moody Tower C6951269548_201_0695March 24 201211:00941 N
Houston Aldine C8/AF108/X150 12848_201_0024March 24 201211:00932
Baytown Wetlands Center C5521255248_201_0552March 24 201211:00931 N
SETRPC Port Arthur C6281062848_245_0628March 24 201215:00931 N
Clear Lake High School C5721257248_201_0572March 25 201212:00921 N
SETRPC 40 Sabine Pass C640/C16541064048_245_0101March 24 201212:00921
Arlington Municipal Airport C6146148_439_3011May 16 201212:00921
La Porte Sylvan Beach C5561255648_201_0556March 25 201211:00901 N
Mercer Arboretum C5571255748_201_0557March 26 201211:00901 N
SETRPC 40 Sabine Pass C640/C16541064048_245_0101March 25 201210:00901
U of H-Sugarland C6961269648_157_0696May 14 201211:00891 N
SETRPC Port Arthur C6281062848_245_0628March 25 201210:00891 N
Channelview C15/AH115 121548_201_0026March 24 201211:00883
Houston North Wayside C4051240548_201_0046March 24 201211:00881
Sheldon C5511255148_201_0551March 24 201211:00881 N
Atascocita C5601256048_201_0560March 24 201211:00881 N
UH Moody Tower C6951269548_201_0695March 25 201211:00881 N
UH Moody Tower C6951269548_201_0695May 17 201211:00881 N
HRM-3 Haden Road C603/A114 1260348_201_0803March 24 201211:00881 N
Manvel Croix Park C84128448_039_1004May 16 201211:00861
Dallas Hinton St. C401/C60/AH161 440148_113_0069May 16 201211:00863
Denton Airport South C56/A163/X15745648_121_0034May 17 201210:00861
Pilot Point C10324103248_121_1032May 17 201210:00861
Lynchburg Ferry C1015/A165 12101548_201_1015March 24 201212:00861
Dallas Executive Airport C402440248_113_0087May 16 201211:00851
Galveston 99th St. C1034/A320/X18312103448_167_1034March 24 201211:00851
Northwest Harris Co. C26/A110/X154122648_201_0029March 26 201212:00852
West Houston C5541255448_201_0554May 17 201210:00851 N
Atascocita C5601256048_201_0560March 26 201211:00851 N
Wallisville Road C617 1261748_201_0617March 24 201212:00851 N
Hou.DeerPrk2 C35/235/1001/AFH139FP239123548_201_1039March 25 201211:00851
UH WG Jones Forest C6981269848_339_0698April 10 201211:00851 N
Manvel Croix Park C84128448_039_1004May 14 201210:00841
Frisco C31/C68043148_085_0005March 24 201211:00841
UH Coastal Center C6971269748_167_0697March 25 201211:00841 N
Galveston 99th St. C1034/A320/X18312103448_167_1034March 25 201213:00841
Houston Aldine C8/AF108/X150 12848_201_0024March 26 201211:00842
West Houston C5541255448_201_0554April 6 201210:00841 N
Meyer Park C5611256148_201_0561March 26 201211:00841 N
Bulverde Elementary C5031350348_091_0503May 17 201210:00831 N
Texas City 34th St. C620 1262048_167_0056May 17 201214:00831 N
Houston Westhollow C4101241048_201_0066May 17 201210:00831
Baytown Wetlands Center C5521255248_201_0552March 25 201211:00831 N
UH WG Jones Forest C6981269848_339_0698May 18 201211:00831 N
Ft. Worth Northwest C13/AH302 41348_439_1002May 16 201211:00832
Frisco C31/C68043148_085_0005May 17 201211:00821
Northwest Harris Co. C26/A110/X154122648_201_0029May 17 201211:00822
Houston Bayland Park C53/A146 125348_201_0055May 17 201210:00821
Houston Regional Office C81128148_201_0070March 24 201211:00821
Houston Texas Avenue C4111241148_201_0075March 24 201211:00821
Bunker Hill Village C5621256248_201_0562May 17 201210:00821 N
Huffman Wolf Road C5631256348_201_0563April 24 201209:00821 N
Conroe Relocated C78/A321127848_339_0078May 18 201211:00821
Grapevine Fairway C70/A301/X18247048_439_3009March 25 201211:00821
Manvel Croix Park C84128448_039_1004May 17 201210:00811
UH Coastal Center C6971269748_167_0697March 23 201211:00811 N
Galveston 99th St. C1034/A320/X18312103448_167_1034March 26 201213:00811
Houston Westhollow C4101241048_201_0066May 14 201210:00811
La Porte Sylvan Beach C5561255648_201_0556March 26 201211:00811 N
Clear Brook High School C5701257048_201_0570May 16 201211:00811 N
Clinton C403/C304/AH113 1240348_201_1035March 24 201211:00813
SETRPC Port Arthur C6281062848_245_0628March 23 201211:00811 N
Conroe Relocated C78/A321127848_339_0078April 10 201211:00811
U of H-Sugarland C6961269648_157_0696May 17 201210:00801 N
Texas City 34th St. C620 1262048_167_0056March 26 201209:00801 N
Northwest Harris Co. C26/A110/X154122648_201_0029April 7 201211:00802
Crosby Library C5531255348_201_0553March 26 201210:00801 N
Mercer Arboretum C5571255748_201_0557March 24 201210:00801 N
Clear Brook High School C5701257048_201_0570March 24 201212:00801 N
Clear Lake High School C5721257248_201_0572April 9 201211:00801 N
UH Moody Tower C6951269548_201_0695April 9 201211:00801 N
Lynchburg Ferry C1015/A165 12101548_201_1015March 26 201211:00801
Grapevine Fairway C70/A301/X18247048_439_3009May 17 201210:00801
City of Garden Ridge C5051350548_091_0505April 22 201211:00791 N
Dallas North No.2 C63/C67946348_113_0075May 16 201211:00791
Houston Croquet C4091240948_201_0051May 17 201210:00792
Houston Monroe C4061240648_201_0062March 24 201212:00791
Park Place C4161241648_201_0416March 24 201211:00791
Huffman Wolf Road C5631256348_201_0563April 19 201210:00791 N
Clear Lake High School C5721257248_201_0572March 26 201209:00791 N
Clear Lake High School C5721257248_201_0572May 16 201210:00791 N
Houston East C1/G31612148_201_1034March 26 201211:00792
Aransas Pass C6591465948_409_0659May 17 201211:00791 N
Odem C6861468648_409_0686May 17 201209:00791 N
Keller C1741748_439_2003March 25 201212:00792
Grapevine Fairway C70/A301/X18247048_439_3009May 16 201211:00791
Mustang Bayou C619 1261948_039_0619May 16 201212:00781 N
Manvel Croix Park C84128448_039_1004April 18 201210:00781
Midlothian OFW C52/A13745248_139_0016May 16 201211:00781
Northwest Harris Co. C26/A110/X154122648_201_0029April 6 201211:00782
Mercer Arboretum C5571255748_201_0557April 10 201211:00781 N
Hamshire C64/C654106448_245_0022March 25 201212:00781
SETRPC 43 Jefferson Co Airport C6431064348_245_0102March 26 201210:00781
UH WG Jones Forest C6981269848_339_0698April 19 201211:00781 N
Keller C1741748_439_2003May 17 201210:00782
Audubon C38113848_453_0020May 17 201210:00781
CAPCOG Lake Georgetown C6901169048_491_0690May 17 201210:00781 N
Manvel Croix Park C84128448_039_1004March 24 201211:00771
U of H-Sugarland C6961269648_157_0696April 18 201211:00771 N
UH Coastal Center C6971269748_167_0697May 17 201213:00771 N
Lang C4081240848_201_0047March 24 201211:00772
Lang C4081240848_201_0047May 17 201210:00772
Houston Bayland Park C53/A146 125348_201_0055May 14 201210:00771
Houston Westhollow C4101241048_201_0066April 18 201211:00771
Houston Texas Avenue C4111241148_201_0075March 25 201211:00771
Sheldon C5511255148_201_0551March 26 201210:00771 N
Crosby Library C5531255348_201_0553March 24 201210:00771 N
Katy Park C5591255948_201_0559April 6 201211:00771 N
Katy Park C5591255948_201_0559May 17 201211:00771 N
Atascocita C5601256048_201_0560May 18 201210:00771 N
Bunker Hill Village C5621256248_201_0562May 14 201210:00771 N
Clear Lake High School C5721257248_201_0572March 23 201212:00771 N
Seabrook Friendship Park C45124548_201_1050March 26 201211:00771
Conroe Relocated C78/A321127848_339_0078April 19 201211:00771
UH WG Jones Forest C6981269848_339_0698May 19 201210:00771 N
San Antonio Northwest C23132348_029_0032May 17 201211:00762
Fair Oaks Ranch C5021350248_029_0502May 17 201211:00761 N
Mustang Bayou C619 1261948_039_0619April 9 201212:00761 N
Dallas North No.2 C63/C67946348_113_0075March 24 201211:00761
Northwest Harris Co. C26/A110/X154122648_201_0029April 10 201210:00762
Lang C4081240848_201_0047April 6 201210:00762
Houston Croquet C4091240948_201_0051May 14 201210:00762
Park Place C4161241648_201_0416March 25 201211:00761
Sheldon C5511255148_201_0551April 10 201210:00761 N
La Porte Sylvan Beach C5561255648_201_0556April 10 201209:00761 N
Atascocita C5601256048_201_0560April 10 201211:00761 N
Huffman Wolf Road C5631256348_201_0563March 26 201210:00761 N
UH Moody Tower C6951269548_201_0695March 23 201213:00761 N
UH Moody Tower C6951269548_201_0695March 26 201211:00761 N
Houston East C1/G31612148_201_1034March 25 201211:00762
Hou.DeerPrk2 C35/235/1001/AFH139FP239123548_201_1039March 26 201210:00761
Beaumont-Downtown C2/A112/C2002 10248_245_0009March 26 201210:00762
SETRPC 40 Sabine Pass C640/C16541064048_245_0101March 26 201210:00761
UH WG Jones Forest C6981269848_339_0698April 24 201211:00761 N
Parker County C7647648_367_0081May 16 201215:00761
Eagle Mountain Lake C75 47548_439_0075March 25 201211:00761
Eagle Mountain Lake C75 47548_439_0075May 16 201211:00761
Eagle Mountain Lake C75 47548_439_0075May 17 201210:00761
Keller C1741748_439_2003May 16 201212:00762
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.

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.