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Peak Daily One-Hour Ozone Averages for March 2015

The table below lists the peak daily one-hour ozone concentrations measured in March 2015 in each community where the TCEQ measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

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 using AQI colors
AreaMonitoring SitePOCMarch 2015
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 228
Keller C17225
Frisco C31/C680126
Midlothian OFW C52/A137124
Denton Airport South C56/A163/X157127
Arlington Municipal Airport C61123
Dallas North No.2 C63/C679123
Rockwall Heath C69129
Grapevine Fairway C70/A301/X182126
Kaufman C71/A304/X071126
Granbury C73/C681126
Eagle Mountain Lake C75 126
Parker County C76132
Cleburne Airport C77/C682125
Dallas Hinton St. C401/C60/AH161 323
Dallas Executive Airport C402121
Greenville C1006/A198128
Pilot Point C1032129
Italy C1044/A323124
Corsicana Airport C1051125
AreaMonitoring SitePOCMarch 2015
Longview C19/A127/C644223
Tyler Airport Relocated C82125
Karnack C85/AFHP303126
AreaMonitoring SitePOCMarch 2015
El Paso-Juarez
El Paso UTEP C12/A125/X151245
Ascarate Park SE C37/A332/A172/X159135
Chamizal C41/AH126 141
Socorro Hueco C49/F312142
Skyline Park C72146
BRAVO Big Bend C67/C316/C656/C6913 N31
Ivanhoe C414139
AreaMonitoring SitePOCMarch 2015
Waco Mazanec C1037123
Temple Georgia C1045121
Killeen Skylark Field C1047125
AreaMonitoring SitePOCMarch 2015
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 230
West Orange C9/A141228
Port Arthur West C28/A128/A228132
Hamshire C64/C654138
SETRPC Port Arthur C6281 N35
SETRPC 40 Sabine Pass C640/C1654130
SETRPC Mauriceville 42 C642/C311/C6651 N32
SETRPC 43 Jefferson Co Airport C643134
Nederland High School C1035 136
AreaMonitoring SitePOCMarch 2015
Austin Northwest C3/A322220
Audubon C38121
Fayette County C6012 N19
AreaMonitoring SitePOCMarch 2015
Houston East C1/G316233
Houston Aldine C8/AF108/X150 222
Channelview C15/AH115 337
Northwest Harris Co. C26/A110/X154218
Hou.DeerPrk2 C35/235/1001/AFH139FP239137
Seabrook Friendship Park C45137
Houston Bayland Park C53/A146 133
Conroe Relocated C78/A321124
Manvel Croix Park C84139
Clinton C403/C304/AH113 330
Houston North Wayside C405130
Houston Monroe C406132
Lang C408223
Houston Croquet C409234
Houston Westhollow C410129
Houston Texas Avenue C411128
Park Place C416137
Sheldon C5511 N30
Baytown Wetlands Center C5521 N27
Crosby Library C5531 N27
West Houston C5541 N18
La Porte Sylvan Beach C5561 N38
Mercer Arboretum C5571 N16
Tom Bass C5581 N32
Katy Park C5591 N11
Atascocita C5601 N18
Meyer Park C5611 N18
Bunker Hill Village C5621 N25
Huffman Wolf Road C5631 N7
HRM-3 Haden Road C603/A114 1 N29
Wallisville Road C617 1 N43
Danciger C618 1 N34
Mustang Bayou C619 1 N36
Texas City 34th St. C620 1 N42
UH Moody Tower C6951 N40
U of H-Sugarland C6961 N34
UH Coastal Center C6971 N33
UH WG Jones Forest C6981 N21
UH West Liberty C6991 N34
Lynchburg Ferry C1015/A165 134
Lake Jackson C1016 137
Baytown Garth C1017143
Galveston 99th St. C1034/A320/X183141
AreaMonitoring SitePOCMarch 2015
San Antonio
San Antonio Northwest C23219
Camp Bullis C58120
Calaveras Lake C59117
Heritage Middle School C6221 N17
CPS Pecan Valley C6781 N14
AreaMonitoring SitePOCMarch 2015
Corpus Christi-Victoria
Corpus Christi West C4215
Corpus Christi Tuloso C21114
Victoria C87118
Aransas Pass C6591 N25
Holly Road C6601 N8
Violet C6641 NNA
Ingleside C6851 N22
Odem C6861 N14
Taft C6871 N12
AreaMonitoring SitePOCMarch 2015
Lower Rio Grande Valley
Mission C43/AP143120
Brownsville C80/AGP180112
Harlingen Teege C1023115
AreaMonitoring SitePOCMarch 2015
Laredo Vidaurri C44/AFGP144/P244116
NA - Data not available.
 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.