Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

In Texas, higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

Use the controls below to select a different date or parameter. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.

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Region	CAMS	Morning				CAMS	POC	Entity
Ozone Hourly Averages for Tuesday, May 12, 2026. measured in parts per billion
Region	CAMS	Mid	1:00	2:00	3:00	CAMS	POC	Entity
San Antonio - all times are in CST
	23	29	25	18	FEW	23	2 ^R ^MDL	TCEQ
	58	9	7	4	FEW	58	1 ^R ^MDL	TCEQ
	59	33	33	26	FEW	59	1 ^R ^MDL	TCEQ
	501 ¹	29	14	8	FEW	501 ¹	1 ^N ^MDL	Oth Gov
	502 ¹	15	12	13	FEW	502 ¹	1 ^N ^MDL	Oth Gov
	503 ¹	10	7	1	FEW	503 ¹	1 ^N ^MDL	TCEQ
	504 ¹	19	19	13	FEW	504 ¹	1 ^N ^MDL	TCEQ
	505 ²	29	32	31	FEW	505 ²	1 ^N ^MDL	Other Gov
	506 ¹	5	2	3	FEW	506 ¹	1 ^N ^MDL	TCEQ
	622 ³	33	26	22	FEW	622 ³	1 ^N ^MDL	TCEQ
	678 ³	19	9	5	FEW	678 ³	1 ^N	TCEQ
	1610 ³	6	3	4	FEW	1610 ³	1 ^N ^MDL	TCEQ
		Notes: ¹- These sites are maintained and operated by Weston Solutions Inc. for Alamo Area Council of Governments. ²- These sites are maintained and operated by Weston Solutions for AACoG. ³- These sites are maintained and operated by Weston Solutions Inc. for City Public Service. TCEQ does not certify the validity or quality of data it hosts from other monitoring entities.
		Maximum values for the day are bold within the table. Minimum values are *bold italic*.
		^R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.
		^N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

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.

Texas Commission on Environmental Quality

Ozone Hourly Averages