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Eight-Hour Ozone High Value Days for 2014
as of October 31

The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 76 parts per billion in 2014 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
2014 Sorted by Maximum Value
LocationRegionCAMSAQSDateTimeValuePOC
Manvel Croix Park C84 12 8448_039_1004October 25 201411:00951
Heritage Middle School C622 13 62248_029_0622May 30 201411:00911 N
Granbury C73/C681 4 7348_221_0001July 23 201413:00911
Pilot Point C1032 4 103248_121_1032July 25 201411:00881
Ft. Worth Northwest C13/AH302 4 1348_439_1002July 23 201410:00882
Granbury C73/C681 4 7348_221_0001July 24 201412:00871
Hou.DeerPrk2 C35/235/1001/AFH139FP239 12 3548_201_1039October 25 201410:00861
Frisco C31/C680 4 3148_085_0005July 25 201410:00831
Denton Airport South C56/A163/X157 4 5648_121_0034August 5 201411:00831
UH WG Jones Forest C698 12 69848_339_0698July 30 201411:00831 N
Mustang Bayou C619 12 61948_039_0619May 29 201412:00821 N
Manvel Croix Park C84 12 8448_039_1004August 13 201410:00821
Denton Airport South C56/A163/X157 4 5648_121_0034August 14 201411:00821
Grapevine Fairway C70/A301/X182 4 7048_439_3009August 14 201410:00821
Calaveras Lake C59 13 5948_029_0059May 30 201411:00811
Katy Park C559 12 55948_201_0559August 14 201410:00811 N
Ft. Worth Northwest C13/AH302 4 1348_439_1002July 24 201411:00812
SETRPC 40 Sabine Pass C640/C1654 10 64048_245_0101May 2 201413:00801
UH West Liberty C699 12 69948_291_0699May 3 201411:00801 N
Conroe Relocated C78/A321 12 7848_339_0078May 5 201410:00801
Keller C17 4 1748_439_2003August 14 201411:00802
San Antonio Northwest C23 13 2348_029_0032October 23 201411:00792
Pilot Point C1032 4 103248_121_1032August 14 201410:00791
Cleburne Airport C77/C682 4 7748_251_0003July 23 201412:00791
SETRPC Mauriceville 42 C642/C311/C665 10 64248_361_1100May 3 201410:00791 N
Ft. Worth Northwest C13/AH302 4 1348_439_1002July 22 201411:00792
Ft. Worth Northwest C13/AH302 4 1348_439_1002August 14 201410:00792
Danciger C618 12 61848_039_0618August 13 201410:00781 N
Denton Airport South C56/A163/X157 4 5648_121_0034July 16 201410:00781
Pilot Point C1032 4 103248_121_1032June 11 201411:00781
Wallisville Road C617 12 61748_201_0617June 11 201408:00781 N
UH West Liberty C699 12 69948_291_0699May 4 201410:00781 N
Parker County C76 4 7648_367_0081September 25 201412:00781
Eagle Mountain Lake C75 4 7548_439_0075August 14 201412:00781
Eagle Mountain Lake C75 4 7548_439_0075September 25 201411:00781
Arlington Municipal Airport C61 4 6148_439_3011July 23 201411:00781
City of Garden Ridge C505 13 50548_091_0505October 24 201411:00771 N
Denton Airport South C56/A163/X157 4 5648_121_0034July 25 201410:00771
Beaumont-Downtown C2/A112/C2002 10 248_245_0009May 3 201410:00772
UH WG Jones Forest C698 12 69848_339_0698May 5 201410:00771 N
Parker County C76 4 7648_367_0081September 26 201413:00771
Camp Bullis C58 13 5848_029_0052October 23 201410:00761
CPS Pecan Valley C678 13 67848_029_0055May 30 201411:00761 N
Manvel Croix Park C84 12 8448_039_1004August 25 201412:00761
Denton Airport South C56/A163/X157 4 5648_121_0034September 24 201411:00761
Cuero C1602 14 160248_123_1602September 24 201415:00761 N
Cuero C1602 14 160248_123_1602October 25 201410:00761 N
Galveston 99th St. C1034/A320/X183 12 103448_167_1034August 12 201412:00761
Houston Croquet C409 12 40948_201_0051August 25 201412:00762
Houston Monroe C406 12 40648_201_0062October 25 201410:00761
Houston Westhollow C410 12 41048_201_0066August 14 201410:00761
Wallisville Road C617 12 61748_201_0617May 2 201411:00761 N
UH Moody Tower C695 12 69548_201_0695July 24 201412:00761 N
Cleburne Airport C77/C682 4 7748_251_0003August 13 201412:00761
UH West Liberty C699 12 69948_291_0699May 5 201408:00761 N
UH WG Jones Forest C698 12 69848_339_0698July 16 201412:00761 N
Holly Road C660 14 66048_355_0660May 29 201411:00761 N
Eagle Mountain Lake C75 4 7548_439_0075September 26 201411:00761
Ft. Worth Northwest C13/AH302 4 1348_439_1002September 26 201411:00762
Keller C17 4 1748_439_2003September 25 201411:00762
Grapevine Fairway C70/A301/X182 4 7048_439_3009August 5 201410:00761
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.