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Daily Maximum Eight-Hour Ozone Averages for March 2015

The table below lists the peak daily maximum eight-hour ozone concentrations measured in March 2015 in each community where the TCEQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

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 with AQI colors
AreaMonitoring SitePOCMarch 2015
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 216
Keller C17220
Frisco C31/C680123
Midlothian OFW C52/A137117
Denton Airport South C56/A163/X157124
Arlington Municipal Airport C61115
Dallas North No.2 C63/C679118
Rockwall Heath C69126
Grapevine Fairway C70/A301/X182120
Kaufman C71/A304/X071125
Granbury C73/C681119
Eagle Mountain Lake C75 122
Parker County C76125
Cleburne Airport C77/C682115
Dallas Hinton St. C401/C60/AH161 317
Dallas Executive Airport C402115
Greenville C1006/A198125
Pilot Point C1032124
Italy C1044/A323121
Corsicana Airport C1051123
AreaMonitoring SitePOCMarch 2015
Longview C19/A127/C644219
Tyler Airport Relocated C82120
Karnack C85/AFHP303124
AreaMonitoring SitePOCMarch 2015
El Paso-Juarez
El Paso UTEP C12/A125/X15128
Ascarate Park SE C37/A332/A172/X15913
Chamizal C41/AH126 14
Socorro Hueco C49/F31213
Skyline Park C72118
BRAVO Big Bend C67/C316/C656/C6913 N18
Ivanhoe C414116
AreaMonitoring SitePOCMarch 2015
Waco Mazanec C1037122
Temple Georgia C1045119
Killeen Skylark Field C1047119
AreaMonitoring SitePOCMarch 2015
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 226
West Orange C9/A141222
Port Arthur West C28/A128/A228123
Hamshire C64/C654131
SETRPC Port Arthur C6281 N29
SETRPC 40 Sabine Pass C640/C1654125
SETRPC Mauriceville 42 C642/C311/C6651 N27
SETRPC 43 Jefferson Co Airport C643128
Nederland High School C1035 130
AreaMonitoring SitePOCMarch 2015
Austin Northwest C3/A322218
Audubon C38116
AreaMonitoring SitePOCMarch 2015
Houston East C1/G316222
Houston Aldine C8/AF108/X150 216
Channelview C15/AH115 325
Northwest Harris Co. C26/A110/X154216
Hou.DeerPrk2 C35/235/1001/AFH139FP239127
Seabrook Friendship Park C45130
Houston Bayland Park C53/A146 119
Conroe Relocated C78/A321116
Manvel Croix Park C84131
Clinton C403/C304/AH113 321
Houston North Wayside C405120
Houston Monroe C406124
Lang C408214
Houston Croquet C409226
Houston Westhollow C410117
Houston Texas Avenue C411115
Park Place C416127
Baytown Wetlands Center C5521 N19
Crosby Library C5531 N16
West Houston C5541 N12
La Porte Sylvan Beach C5561 N28
Mercer Arboretum C5571 N12
Tom Bass C5581 N26
Katy Park C5591 N10
Atascocita C5601 N13
Meyer Park C5611 N15
Bunker Hill Village C5621 N16
Huffman Wolf Road C5631 N5
HRM-3 Haden Road C603/A114 1 N24
Wallisville Road C617 1 N32
Danciger C618 1 N29
Mustang Bayou C619 1 N29
Texas City 34th St. C620 1 N32
U of H-Sugarland C6961 N22
UH Coastal Center C6971 N25
UH WG Jones Forest C6981 N16
UH West Liberty C6991 N22
Lynchburg Ferry C1015/A165 126
Lake Jackson C1016 131
Baytown Garth C1017131
Galveston 99th St. C1034/A320/X183132
AreaMonitoring SitePOCMarch 2015
San Antonio
San Antonio Northwest C23216
Camp Bullis C58117
Calaveras Lake C59115
Heritage Middle School C6221 N15
CPS Pecan Valley C6781 N8
AreaMonitoring SitePOCMarch 2015
Corpus Christi-Victoria
Corpus Christi West C4212
Corpus Christi Tuloso C21113
Victoria C87114
Aransas Pass C6591 N18
Holly Road C6601 N6
Violet C6641 N0
Ingleside C6851 N13
Odem C6861 N11
Taft C6871 N9
AreaMonitoring SitePOCMarch 2015
Lower Rio Grande Valley
Mission C43/AP14317
Brownsville C80/AGP18017
Harlingen Teege C102318
AreaMonitoring SitePOCMarch 2015
Laredo Vidaurri C44/AFGP144/P24413
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.