Four Highest Eight-Hour Ozone Concentrations in 2013
as of May 23

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 2013 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.

Year	Report Format
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013	Tabular (Web Formatted) Comma-Delimited
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	2	05/07/2013	1100	66	05/12/2013	1100	65	05/14/2013	1000	64	05/22/2013	1200	63
	Keller C17	2	05/12/2013	1200	67	05/07/2013	1100	67	05/14/2013	1000	64	05/13/2013	1000	63
	Frisco C31/C680	1	05/07/2013	1100	74	05/14/2013	1100	69	05/13/2013	1200	69	03/14/2013	1200	66
	Midlothian OFW C52/A137	1	05/13/2013	1200	64	03/14/2013	1100	64	05/14/2013	1100	63	05/07/2013	1000	62
	Denton Airport South C56/A163/X157	1	05/07/2013	1100	77	05/22/2013	1200	70	05/14/2013	1000	70	05/13/2013	1000	66
	Arlington Municipal Airport C61	1	05/12/2013	1100	61	05/14/2013	1100	60	05/13/2013	1200	59	05/07/2013	1000	59
	Dallas North No.2 C63/C679	1	05/07/2013	1100	69	03/14/2013	1200	67	05/13/2013	1200	64	05/14/2013	1100	63
	Rockwall Heath C69	1	03/14/2013	1200	70	05/13/2013	1100	65	03/27/2013	1100	63	05/14/2013	1100	61
	Grapevine Fairway C70/A301/X182	1	05/07/2013	1100	69	05/14/2013	1000	66	05/13/2013	1100	65	05/12/2013	1300	64
	Kaufman C71/A304/X071	1	03/27/2013	1200	65	03/14/2013	1100	65	05/14/2013	1000	61	05/13/2013	1100	61
	Granbury C73/C681	1	05/14/2013	1200	62	05/12/2013	1100	62	05/22/2013	1100	61	05/07/2013	1000	61
	Eagle Mountain Lake C75	1	05/07/2013	1100	68	05/12/2013	1100	64	05/14/2013	1100	62	05/22/2013	1200	60
	Parker County C76	1	05/12/2013	1200	63	05/22/2013	1100	62	05/07/2013	1100	60	04/13/2013	1500	60
	Cleburne Airport C77/C682	1	05/07/2013	1100	62	05/14/2013	1100	61	05/13/2013	1300	60	03/27/2013	1200	60
	Dallas Hinton St. C401/C60/AH161	3	05/07/2013	1200	66	03/14/2013	1100	63	05/14/2013	1100	62	05/13/2013	1200	62
	Dallas Executive Airport C402	1	03/14/2013	1100	63	05/07/2013	1100	61	03/27/2013	1100	58	05/13/2013	1200	57
	Greenville C1006/A198	1	03/14/2013	1000	66	05/14/2013	1100	63	04/12/2013	1100	63	03/27/2013	1100	63
	Pilot Point C1032	1	05/14/2013	1100	74	05/07/2013	1100	72	05/13/2013	1100	71	05/22/2013	1100	67
	Italy C1044/A323	1	03/14/2013	1100	66	05/13/2013	1100	62	03/27/2013	1000	60	05/11/2013	1000	58
	Corsicana Airport C1051	1	05/13/2013	1100	64	03/27/2013	1100	64	05/07/2013	1100	63	05/14/2013	1000	59
Tyler-Longview-Marshall
	Longview C19/A127/C644	2	04/05/2013	1100	64	05/07/2013	1100	63	04/12/2013	1100	61	03/14/2013	1100	61
	Tyler Airport Relocated C82	1	03/14/2013	1100	63	05/14/2013	1200	62	04/25/2013	1100	60	03/27/2013	1100	60
	Karnack C85/AFHP303	1	05/14/2013	0900	63	05/08/2013	0900	62	03/08/2013	1300	61	05/13/2013	1100	60
El Paso-Juarez
	El Paso UTEP C12/A125/X151	2	04/28/2013	1000	73	05/04/2013	1100	68	04/27/2013	1100	68	05/23/2013	1000	66
	Ascarate Park SE C37/A332/A172/X159	1	04/28/2013	1000	60	05/04/2013	1400	59	04/27/2013	1100	56	05/23/2013	1000	55
	Chamizal C41/AH126	1	04/28/2013	1000	68	05/19/2013	1100	64	04/27/2013	1100	63	05/20/2013	0900	62
	Socorro Hueco C49/F312	1	04/28/2013	1100	59	05/14/2013	0900	57	05/04/2013	1100	57	04/17/2013	1800	56
	Skyline Park C72	1	05/19/2013	1800	64	05/23/2013	1000	62	05/04/2013	1100	61	05/20/2013	0700	60
	BRAVO Big Bend C67/C316/C656/C691	3 N	05/21/2013	1600	67	05/17/2013	1000	67	04/30/2013	1200	67	05/20/2013	1000	66
	Ivanhoe C414	1	04/28/2013	1100	62	05/23/2013	1000	61	05/14/2013	1000	59	05/20/2013	0700	58
	Cd Juarez Advance C661	1 N	03/13/2013	1000	49	03/20/2013	1000	45	03/17/2013	1000	45	03/31/2013	1000	44
	Cd Juarez 20-30 Club C662	1 N	05/04/2013	1100	51	05/23/2013	1000	50	04/28/2013	1000	50	04/27/2013	1000	47
	Cd Juarez Delphi C663	1 N	04/28/2013	1100	51	05/20/2013	2000	50	05/04/2013	1100	50	04/17/2013	1700	50
Waco
	Waco Mazanec C1037	1	05/13/2013	1100	66	03/14/2013	1000	66	05/11/2013	1000	65	04/20/2013	1500	61
	Killeen Skylark Field C1047	1	05/13/2013	1100	69	03/27/2013	1000	66	03/13/2013	1200	66	05/14/2013	1000	65
Beaumont-Port Arthur
	Beaumont-Downtown C2/A112/C2002	2	04/22/2013	0900	65	05/13/2013	1000	64	05/04/2013	1000	64	04/21/2013	1000	63
	West Orange C9/A141	2	05/07/2013	1200	62	05/13/2013	1100	59	05/04/2013	1000	59	04/22/2013	0900	57
	Port Arthur West C28/A128/A228	1	04/12/2013	1100	62	05/07/2013	1300	58	04/22/2013	0900	58	04/05/2013	1100	57
	Hamshire C64/C654	1	04/12/2013	1100	75	05/07/2013	1100	69	05/13/2013	0900	66	05/04/2013	1000	62
	SETRPC Port Arthur C628	1 N	04/12/2013	1000	65	05/07/2013	1200	61	05/13/2013	1000	59	04/22/2013	1000	59
	SETRPC 40 Sabine Pass C640/C1654	1	05/07/2013	1300	67	04/12/2013	1100	66	04/05/2013	1100	62	05/13/2013	1000	61
	SETRPC Mauriceville 42 C642/C311/C665	1 N	05/04/2013	1000	67	04/22/2013	1000	67	04/21/2013	1000	65	04/14/2013	1000	64
	SETRPC 43 Jefferson Co Airport C643	1	05/13/2013	1000	57	04/22/2013	0900	57	04/12/2013	1000	57	05/07/2013	1300	56
	Nederland High School C1035	1	05/13/2013	1000	63	05/04/2013	1000	63	05/07/2013	1300	62	05/14/2013	1100	59
Austin
	Austin Northwest C3/A322	2	05/13/2013	1100	68	03/13/2013	1100	68	05/07/2013	1000	62	03/14/2013	1000	62
	Audubon C38	1	05/13/2013	1100	70	03/13/2013	1200	68	05/22/2013	1000	67	05/07/2013	1100	64
	Fayette County C601	2 N	05/04/2013	1000	62	05/13/2013	1200	60	05/07/2013	1300	59	04/20/2013	1100	59
	Dripping Springs School C614	1 N	05/13/2013	1100	69	05/07/2013	1000	62	04/20/2013	1100	62	05/22/2013	0900	58
	CAPCOG McKinney Roughs C684	1 N	05/13/2013	1100	68	05/07/2013	1200	66	05/11/2013	1400	64	05/04/2013	1100	63
	CAPCOG Lake Georgetown C690	1 N	05/13/2013	1100	69	05/22/2013	1200	67	05/07/2013	1100	65	05/18/2013	0900	59
	CAPCOG San Marcos Staples Road C1675	1 N	05/04/2013	1100	67	05/13/2013	1000	66	05/07/2013	1000	64	04/20/2013	1200	64
	CAPCOG Hutto College Street C6602	1 N	05/13/2013	1100	69	05/07/2013	1100	64	05/11/2013	1200	63	05/22/2013	1100	60
Houston-Galveston-Brazoria
	Houston East C1/G316	2	05/07/2013	1100	69	04/22/2013	1000	64	04/05/2013	1100	64	05/01/2013	1100	63
	Houston Aldine C8/AF108/X150	2	05/07/2013	1100	73	05/01/2013	1100	72	05/13/2013	1100	67	04/22/2013	0900	67
	Channelview C15/AH115	3	05/07/2013	1100	60	05/04/2013	1100	58	04/12/2013	1100	57	03/15/2013	1000	56
	Northwest Harris Co. C26/A110/X154	2	05/13/2013	1100	82	04/22/2013	1100	71	05/07/2013	1100	65	05/01/2013	1100	65
	Hou.DeerPrk2 C35/235/1001/AFH139FP239	1	05/07/2013	1100	62	04/05/2013	1100	62	05/13/2013	1000	57	05/14/2013	0900	56
	Seabrook Friendship Park C45	1	05/07/2013	1100	64	05/13/2013	1000	60	04/13/2013	1600	59	04/12/2013	1300	59
	Houston Bayland Park C53/A146	1	04/12/2013	1200	68	05/07/2013	1100	66	05/13/2013	1000	65	05/01/2013	1000	62
	Conroe Relocated C78/A321	1	05/14/2013	1000	78	04/22/2013	1100	75	05/13/2013	1100	71	05/07/2013	1200	69
	Manvel Croix Park C84	1	04/05/2013	1100	67	05/13/2013	1100	66	05/07/2013	1100	64	03/13/2013	1000	64
	Clinton C403/C304/AH113	3	04/12/2013	1000	64	03/12/2013	1100	58	05/13/2013	0900	57	05/07/2013	1100	57
	Houston North Wayside C405	1	05/01/2013	1100	66	05/07/2013	1200	65	05/13/2013	1000	63	04/22/2013	1000	61
	Houston Monroe C406	1	05/07/2013	1100	61	04/05/2013	0900	60	05/04/2013	1000	58	04/12/2013	1100	58
	Lang C408	2	05/07/2013	1000	79	05/13/2013	1000	68	05/01/2013	1100	66	04/22/2013	1100	64
	Houston Croquet C409	2	04/12/2013	1100	65	03/13/2013	1100	62	05/13/2013	1100	61	05/07/2013	1000	61
	Houston Westhollow C410	1	05/13/2013	1100	65	05/07/2013	1100	65	04/12/2013	1100	60	03/13/2013	1200	59
	Houston Texas Avenue C411	1	04/12/2013	1100	63	05/13/2013	1000	59	04/22/2013	1100	57	03/12/2013	1300	56
	Park Place C416	1	05/07/2013	1100	63	04/05/2013	1100	61	05/13/2013	1000	60	04/12/2013	1000	60
	Sheldon C551	1 N	05/07/2013	1000	64	04/22/2013	1000	63	03/12/2013	1000	62	05/01/2013	1100	61
	Baytown Wetlands Center C552	1 N	02/15/2013	1000	55	03/21/2013	0900	54	03/12/2013	1100	54	03/08/2013	0900	54
	Crosby Library C553	1 N	05/07/2013	1000	76	05/13/2013	1000	62	05/04/2013	1100	62	05/14/2013	1000	59
	West Houston C554	1 N	05/13/2013	1100	73	05/22/2013	1100	68	05/07/2013	1100	68	04/22/2013	1100	65
	La Porte Sylvan Beach C556	1 N	05/14/2013	0700	50	03/08/2013	1500	49	02/03/2013	1100	48	02/01/2013	1200	48
	Mercer Arboretum C557	1 N	05/07/2013	1100	81	04/22/2013	1100	73	05/13/2013	1100	72	05/01/2013	1100	72
	Tom Bass C558	1 N	03/13/2013	1100	61	05/13/2013	1100	59	05/07/2013	1100	59	04/12/2013	1200	56
	Katy Park C559	1 N	03/13/2013	1000	58	04/12/2013	1200	57	05/07/2013	1000	56	04/13/2013	1000	54
	Atascocita C560	1 N	03/27/2013	1000	59	03/28/2013	0900	57	01/20/2013	1000	57	03/15/2013	1000	55
	Meyer Park C561	1 N	05/01/2013	1200	77	05/13/2013	1100	76	05/07/2013	1100	71	04/22/2013	1100	68
	Bunker Hill Village C562	1 N	05/07/2013	1100	72	05/13/2013	1100	68	05/01/2013	1000	65	04/12/2013	1200	60
	Huffman Wolf Road C563	1 N	05/07/2013	1100	76	04/22/2013	1000	65	05/13/2013	1000	63	03/15/2013	1000	63
	HRM-3 Haden Road C603/A114	1 N	05/07/2013	1100	72	04/05/2013	1000	69	04/12/2013	1100	66	05/13/2013	0900	64
	Wallisville Road C617	1 N	05/07/2013	1000	74	05/04/2013	1000	65	04/12/2013	1200	64	05/13/2013	1000	62
	Danciger C618	1 N	05/07/2013	0900	65	04/13/2013	1000	65	04/12/2013	1100	65	03/13/2013	1000	65
	Mustang Bayou C619	1 N	04/12/2013	1200	67	05/13/2013	1000	58	05/07/2013	1000	58	04/13/2013	1000	58
	Texas City 34th St. C620	1 N	05/13/2013	0900	60	05/07/2013	1100	60	04/12/2013	1200	60	04/13/2013	1000	59
	UH Moody Tower C695	1 N	04/12/2013	1100	66	05/13/2013	1100	64	05/07/2013	1100	60	05/04/2013	1100	58
	U of H-Sugarland C696	1 N	04/12/2013	1100	71	03/13/2013	1100	68	04/13/2013	1000	60	03/12/2013	1300	60
	UH Coastal Center C697	1 N	05/07/2013	1100	61	05/13/2013	1000	60	04/13/2013	1100	60	04/12/2013	1200	60
	UH WG Jones Forest C698	1 N	04/22/2013	1100	84	05/13/2013	1100	79	05/01/2013	1200	77	05/07/2013	1200	74
	UH West Liberty C699	1 N	05/07/2013	1100	66	05/04/2013	1100	60	05/13/2013	1000	59	04/22/2013	1000	59
	Lynchburg Ferry C1015/A165	1	05/07/2013	1100	61	04/05/2013	1100	56	05/13/2013	1100	55	05/04/2013	1000	53
	Lake Jackson C1016	1	05/07/2013	1100	60	04/13/2013	0900	60	04/12/2013	1100	60	03/12/2013	1100	60
	Baytown Eastpoint C1017	1	05/07/2013	1000	68	04/05/2013	1000	59	05/04/2013	1000	58	04/12/2013	1200	57
	Galveston 99th St. C1034/A320/X183	1	05/07/2013	1600	64	04/12/2013	1300	62	03/12/2013	1500	62	03/07/2013	1600	60
San Antonio
	San Antonio Northwest C23	2	05/13/2013	1100	70	03/13/2013	1000	69	04/12/2013	1100	68	04/20/2013	1100	65
	Camp Bullis C58	1	05/13/2013	1000	77	03/13/2013	1100	74	04/12/2013	1200	71	05/07/2013	1100	68
	Calaveras Lake C59	1	03/13/2013	1100	67	04/12/2013	1100	65	05/13/2013	1000	63	04/20/2013	1000	61
	Elm Creek Elementary C501	1 N	05/13/2013	1100	60	04/20/2013	1000	60	05/07/2013	1100	59	05/04/2013	1000	59
	Fair Oaks Ranch C502	1 N	05/13/2013	1100	72	05/07/2013	1100	65	04/12/2013	1200	64	04/20/2013	1100	62
	Bulverde Elementary C503	1 N	05/13/2013	1100	72	04/12/2013	1100	69	04/20/2013	1100	65	05/07/2013	1000	63
	New Braunfels Airport C504	1 N	05/04/2013	1100	61	04/12/2013	1100	61	05/13/2013	1000	60	05/07/2013	1000	58
	City of Garden Ridge C505	1 N	04/12/2013	1700	74	05/13/2013	1100	69	04/20/2013	1100	63	05/04/2013	1100	60
	Seguin Outdoor Learning Center C506	1 N	04/12/2013	1200	64	05/13/2013	1100	62	04/20/2013	1100	59	05/07/2013	1000	57
	Heritage Middle School C622	1 N	03/13/2013	1100	70	04/12/2013	1100	69	05/13/2013	1100	66	04/20/2013	1000	65
	CPS Pecan Valley C678	1 N	05/13/2013	1000	67	03/13/2013	1100	67	04/20/2013	1000	62	05/07/2013	1000	61
Corpus Christi-Victoria
	Corpus Christi West C4	2	03/13/2013	1400	70	05/05/2013	1100	63	04/12/2013	1100	61	05/06/2013	0800	58
	Corpus Christi Tuloso C21	1	03/13/2013	1600	66	05/05/2013	0900	59	04/20/2013	1000	57	04/12/2013	1000	57
	Victoria C87	1	03/13/2013	1100	62	04/12/2013	1100	57	04/13/2013	1100	55	03/12/2013	1100	55
	Inez C609	1 N	05/12/2013	1100	61	05/07/2013	1000	60	04/20/2013	1100	58	05/13/2013	1100	56
	Coleto C624	1 N	05/13/2013	0900	56	05/07/2013	0900	55	05/06/2013	1200	54	05/04/2013	1100	54
	Aransas Pass C659	1 N	03/12/2013	1300	63	05/05/2013	1100	61	05/04/2013	1900	60	03/01/2013	1300	60
	Holly Road C660	1 N	03/13/2013	1300	76	04/12/2013	1000	65	04/20/2013	0900	64	03/14/2013	0900	64
	Violet C664	1 N	05/05/2013	1000	72	03/13/2013	1200	68	05/06/2013	0800	66	04/20/2013	1000	64
	Ingleside C685	1 N	03/13/2013	1200	73	03/14/2013	0900	66	05/05/2013	1000	64	04/12/2013	1100	64
	Odem C686	1 N	03/13/2013	1200	68	05/05/2013	1000	67	04/12/2013	1100	65	03/14/2013	0900	65
	Taft C687	1 N	03/13/2013	1200	57	03/14/2013	0900	55	03/27/2013	0900	54	04/12/2013	1000	52
Lower Rio Grande Valley
	Mission C43/AP143	1	04/20/2013	1000	55	03/20/2013	1700	53	04/21/2013	1000	50	04/12/2013	0900	50
	Brownsville C80/AGP180	1	04/20/2013	1000	59	03/02/2013	1100	58	03/01/2013	1000	57	03/20/2013	1500	54
	Harlingen Teege C1023	1	04/20/2013	1000	63	05/04/2013	0900	62	03/14/2013	1000	60	03/12/2013	1000	57
Laredo
	Laredo Vidaurri C44/AFGP144/P244	1	05/05/2013	1100	54	05/04/2013	1100	51	03/04/2013	1000	51	05/11/2013	1100	50
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

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

• The AQI for ozone is based on either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight. When calculating air quality for the current day, the Virginia DEQ uses a surrogate 8-hour average based on the current hourly average.

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.