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Four Highest Eight-Hour Ozone Concentrations in 2022
as of May 18

Use this form to retrieve the four highest eight-hour ozone concentration averages from data collected at TCEQ monitoring sites beginning December 14, 2005 through today. Although this is our most current data, it is not considered official until it has been certified by our technical staff. This information is updated hourly. All times shown are in Local Standard Time.

The table below lists the four highest daily maximum eight-hour ozone concentrations measured in 2022 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.) The fourth-highest average is in bold black (unless it is highlighted). All ozone measurements are in parts per billion. Times are shown in 24-hour format and correspond to the beginning of the eight hour average.

Use the selection boxes below to customize this report. You may select a different year or a different report format. If you want to cut and paste data from this web page into another application, such as a spreadsheet, select the comma-delimited format. Click on the Generate Report button once you have made your selections.

YearReport Format
Highlight with AQI colors
Area Monitoring Site POC Highest Second Highest Third Highest Fourth Highest
Date Time Value Date Time Value Date Time Value Date Time Value
Dallas-Fort Worth
Ft. Worth Northwest C13/AH302 205/16/202211008003/26/202211006503/03/202211006503/02/2022120064
Keller C17203/03/202212006503/02/202213006505/16/202213006203/26/2022120062
Frisco C31/C680103/26/202212007705/06/202212007103/02/202211006803/27/2022110067
Midlothian OFW C52/A137103/02/202211006803/26/202211006503/03/202211006404/02/2022110063
Denton Airport South C56/A163/X157105/06/202212007403/03/202211007205/14/202210007103/27/2022110070
Arlington Municipal Airport C61105/16/202211007703/03/202211006703/02/202211006703/26/2022110064
Dallas North No.2 C63/C679103/26/202211006703/02/202212006503/03/202212006405/06/2022110062
Rockwall Heath C69103/26/202211006303/02/202211006203/03/202211005805/06/2022110057
Grapevine Fairway C70/A301/X182103/26/202212007103/03/202211006705/06/202211006405/16/2022120062
Kaufman C71/A304/X071103/02/202211007403/26/202211006703/03/202211006702/11/2022110062
Granbury C73/C681105/16/202211006703/02/202212006404/03/202211006104/01/2022150060
Eagle Mountain Lake C75 103/03/202211007105/06/202211006703/02/202211006603/26/2022120064
Parker County C76105/16/202212007703/02/202213006703/03/202210006605/06/2022120061
Cleburne Airport C77/C682105/16/202210007103/02/202211006803/26/202212006704/02/2022110066
Dallas Hinton St. C401/C60/AH161 305/16/202210005903/02/202211005703/26/202211005603/03/2022110055
Dallas Executive Airport C402105/16/202210007703/26/202211006504/02/202211006104/03/2022100059
Greenville C1006/A198103/02/202211006903/26/202211006703/03/202210006501/14/2022140057
Pilot Point C1032103/26/202211007303/03/202211007103/27/202211006705/14/2022100066
Italy C1044/A323103/02/202211006705/16/202211006603/26/202211006503/03/2022100061
Corsicana Airport C1051103/02/202211006605/16/202210006504/30/202212006403/26/2022110064
Tyler-Longview-Marshall
Longview C19/A127/C644203/03/202211006403/26/202211005903/02/202210005904/02/2022110057
Tyler Airport Relocated C82103/26/202211007103/02/202210007103/13/202212006504/03/2022120063
Karnack C85/AFHP303103/03/202211007203/26/202212006203/20/202210005903/02/2022100059
El Paso-Juarez
Ascarate Park SE C37/A332/A172/X159105/15/202210005904/30/202210005505/14/202211005304/25/2022130052
Chamizal C41/AH126 105/15/202210006605/14/202211005605/16/202210005505/08/2022090055
Socorro Hueco C49/F312105/14/202211006905/15/202210006605/16/202210006204/30/2022100061
Skyline Park C72105/15/202211006805/07/202213006405/06/202210006205/16/2022080061
Ivanhoe C414/F514105/15/202210006005/16/202208005605/14/202211005504/30/2022100052
Ojo De Agua C1021/FG121/FG221105/15/202210006704/30/202211006105/16/202209005805/14/2022110058
Waco
Waco Mazanec C1037103/26/202211006604/02/202211006503/02/202211006104/30/2022110059
Temple Georgia C1045103/02/202211006603/26/202211006504/01/202213006204/02/2022120060
Killeen Skylark Field C1047103/02/202211006903/03/202211006503/16/202212006403/25/2022110063
Beaumont-Port Arthur
Beaumont-Downtown C2/A112/C2002 201/14/202211005905/12/202210005805/06/202209005401/30/2022100054
West Orange C9/A141202/10/202211006003/02/202210005904/09/202210005801/14/2022120058
Port Arthur West C28/A128/A228105/12/202210005502/10/202211005502/09/202210005304/29/2022020051
Hamshire C64/C654103/01/202211006204/14/202211005804/01/202211005803/26/2022100058
SETRPC Port Arthur C6281 N01/14/202212006404/28/202213006103/02/202211006004/09/2022110059
SETRPC 40 Sabine Pass C640/C1654101/14/202211006304/28/202214006203/25/202212006204/29/2022010060
SETRPC Mauriceville 42 C642/C311/C6651 N03/02/202210006704/27/202211006503/26/202210006402/10/2022100064
SETRPC 43 Jefferson Co Airport C643103/02/202210005902/10/202211005901/14/202212005802/09/2022110057
Nederland 17th Street C1035105/16/202210005005/17/202209004605/15/202208004505/13/2022100045
Austin
Austin North Hills Drive C3/A322203/26/202211006604/14/202212006203/25/202210006103/16/2022110061
Audubon C38104/14/202213006403/16/202211006403/26/202210006303/25/2022110062
Dripping Springs School C6141 N03/02/202211008303/26/202211007503/03/202211007503/01/2022110075
CAPCOG Lake Georgetown C6901 N03/25/202211006603/26/202211006504/01/202211006403/16/2022110064
Lockhart C16041 N03/02/202211006904/06/202211006804/14/202211006604/02/2022100066
CAPCOG Bastrop CAMS16121 N03/26/202211006704/14/202212006603/16/202213006303/02/2022100061
CAPCOG Elgin C16131 N03/02/202210007204/14/202212006903/25/202211006903/16/2022120068
CAPCOG East Austin C16191 N03/26/202211007003/02/202211006603/25/202211006503/16/2022110065
CAPCOG Round Rock Brushy Creek W C16201 N03/26/202210006804/14/202213006503/02/202210006504/09/2022110064
CAPCOG San Marcos Staples Road C16751 N03/02/202211007303/25/202211007203/16/202211007203/26/2022100071
Houston-Galveston-Brazoria
Houston East C1/G316205/16/202209007204/27/202210006305/12/202209006203/26/2022100062
Houston Aldine C8/AF108/X150 205/16/202210007105/12/202210006904/27/202210006403/26/2022100061
Channelview C15/AH115 305/16/202209006103/26/202210005704/02/202210005603/25/2022110055
Northwest Harris Co. C26/A110/X154205/06/202211009104/27/202211007905/11/202211007105/12/2022100066
Hou.DeerPrk2 C35/235/1001/AFH139FP239103/25/202212006003/02/202211005804/02/202210005605/12/2022100055
Seabrook Friendship Park C45103/02/202210005903/25/202211005404/01/202213005003/01/2022120050
Houston Bayland Park C53/A146 103/02/202212006704/14/202211006103/26/202209006103/25/2022100061
Conroe Relocated C78/A321105/17/202210007305/12/202211007105/13/202211006903/03/2022110067
Manvel Croix Park C84103/02/202210006304/02/202212006203/25/202211005903/26/2022100058
Clinton C403/C304/AH113 305/16/202210006504/27/202208006504/02/202212006003/02/2022110056
Houston North Wayside C405/C1033105/16/202210006505/12/202210005804/27/202209005503/26/2022100055
Houston Monroe C406103/02/202211005604/02/202211005403/25/202211005103/26/2022100050
Lang C408204/27/202211008405/06/202210006905/16/202211006203/26/2022090060
Houston Croquet C409203/02/202211006403/25/202211005804/02/202212005703/26/2022100057
Houston Westhollow C410/C3003104/14/202210006003/02/202211005904/27/202211005603/25/2022100052
Park Place C416103/02/202211006204/02/202212006103/26/202209005703/25/2022110057
Houston Harvard Street C417104/27/202210008205/16/202210007004/06/202212006303/26/2022090062
Sheldon C5511 N04/14/202211005704/02/202211005403/02/202210005403/01/2022100054
Baytown Wetlands Center C5521 N03/16/202210005603/25/202211005503/02/202211005504/14/2022100053
Crosby Library C5531 N05/16/202210006303/02/202210006003/26/202209005804/27/2022110056
West Houston C5541 N04/27/202211008804/14/202211007405/06/202209006503/25/2022100065
La Porte Sylvan Beach C5561 N03/02/202212005404/01/202216005303/25/202212005203/01/2022140048
Mercer Arboretum C5571 N05/12/202210007605/16/202211006503/26/202210006505/06/2022100064
Tom Bass C5581 N03/02/202211006304/02/202212006203/25/202211005803/16/2022110057
Katy Park C5591 N04/14/202211006504/27/202210006303/02/202210005704/01/2022110054
Atascocita C5601 N05/16/202211006003/26/202210005803/02/202211005605/12/2022100055
Meyer Park C5611 N05/12/202210006805/06/202210006804/27/202211006705/16/2022120063
Bunker Hill Village C5621 N03/02/202212006204/27/202210006004/14/202211005803/26/2022100055
Huffman Wolf Road C5631 N03/26/202210006003/02/202210006005/16/202211005903/03/2022110059
HRM-3 Haden Road C603/A114 1 N04/02/202210006203/26/202210006203/25/202212006103/01/2022110060
Wallisville Road C617 1 N04/14/202211006303/02/202211006103/16/202210005903/01/2022110059
Texas City 34th St. C620 1 N03/02/202210006703/25/202210006603/01/202213006401/30/2022100064
UH Moody Tower C6951 N03/02/202211006305/16/202210005903/26/202210005904/02/2022120058
UH WG Jones Forest C6981 N05/12/202211008305/06/202211007105/17/202210007003/03/2022110068
Lynchburg Ferry C1015/A165 103/16/202211005405/12/202209005103/02/202210005104/09/2022100049
Lake Jackson C1016 103/02/202210006204/02/202212006004/01/202214006003/01/2022110059
Baytown Garth C1017104/14/202211006705/16/202209006603/26/202209006203/16/2022100062
Galveston 99th St. C1034/A320/X183103/01/202213007303/25/202211006204/01/202214006103/19/2022150061
UH Smith Point C16061 N03/02/202210006704/01/202215005803/01/202212005803/25/2022110057
Oyster Creek C1607 1 N03/02/202210007003/01/202211006504/01/202214006204/02/2022110061
UH Launch Trailer C16111 N05/16/202210006504/02/202212006104/27/202209005604/09/2022090056
Liberty Sam Houston Library C16261 N03/26/202210007104/09/202209006603/02/202210006604/01/2022110065
San Antonio
San Antonio Northwest C23204/03/202209006403/26/202210005903/25/202211005903/01/2022110057
Camp Bullis C58 104/03/202209006603/26/202211006403/25/202211006403/16/2022110062
Calaveras Lake C59103/25/202211006103/01/202211005804/02/202211005503/16/2022110055
Elm Creek Elementary C5011 N04/18/202211005604/03/202209005603/26/202210005603/01/2022100056
Fair Oaks Ranch C5021 N04/03/202209005903/25/202212005505/16/202211005403/26/2022100054
Bulverde Elementary C5031 N03/25/202211006204/03/202210006003/26/202210005904/09/2022100056
New Braunfels Airport C5041 N03/25/202210005903/02/202210005503/16/202210005403/01/2022100054
City of Garden Ridge C5051 N03/26/202211005803/25/202212005804/03/202209005503/16/2022110054
Seguin Outdoor Learning Center C5061 N03/16/202211005703/25/202211005303/26/202210005204/14/2022110051
Heritage Middle School C6221 N03/25/202211006404/03/202210006103/26/202211006104/02/2022110058
CPS Pecan Valley C6781 N03/25/202212004504/03/202209004403/16/202211004403/31/2022120042
Government Canyon C16101 N03/01/202210004904/03/202210004804/14/202211004503/26/2022100045
Corpus Christi-Victoria
Corpus Christi West C4203/25/202211005703/02/202212005603/16/202211005503/01/2022110055
Corpus Christi Tuloso C21104/06/202213005803/25/202211005603/16/202211005602/09/2022110056
Victoria C87103/01/202211006003/25/202213005803/16/202211005704/09/2022100054
Lower Rio Grande Valley
Mission C43/AP143103/25/202210006004/06/202210005903/31/202210005704/05/2022110056
Harlingen Teege C1023103/25/202211005403/16/202210005403/26/202210005304/09/2022090051
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 - 0.054
51 - 100 Not Defined 0.055 - 0.070
101 - 150 0.125 - 0.164 0.071 - 0.085
151 - 200 0.165 - 0.204 0.086 - 0.105
201 - 300 0.205 - 0.404 0.106 - 0.200
301 - 400 0.405 - 0.504 Not Defined
401 - 500 Not Defined Not Defined
500+ Not Defined Not Defined
  • The AQI for ozone is based on either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight.

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, 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.