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 Sunday, September 21, 2025. measured in parts per billion
Region	CAMS	Mid	1:00	2:00	3:00	4:00	5:00	6:00	CAMS	POC	Entity
Austin - all times are in CST
	3	26	24	23	20	18	17	15	3	2 ^R ^MDL	TCEQ
	38	24	22	19	17	14	11	9	38	1 ^R ^MDL	TCEQ
	614 ¹	QAS	21	19	18	16	14	FEW	614 ¹	1 ^N ^MDL	Other Gov
	690 ¹	QAS	19	17	14	15	13	FEW	690 ¹	1 ^N ^MDL	Other Gov
	1604 ¹	18	14	13	11	9	8	FEW	1604 ¹	1 ^N ^MDL	Other Gov
	1605 ²	19	16	14	12	11	9	8	1605 ²	1 ^N ^MDL	Private
	1612 ³	23	20	17	14	17	8	FEW	1612 ³	1 ^N ^MDL	Other Gov
	1613 ³	24	21	19	17	16	14	FEW	1613 ³	1 ^N ^MDL	Other Gov
	1619 ⁴	QAS	26	24	22	21	19	FEW	1619 ⁴	1 ^N ^MDL	Other Gov
	1620 ⁴	QAS	24	23	21	19	18	FEW	1620 ⁴	1 ^N ^MDL	Other Gov
	1629 ⁵	QAS	22	21	19	17	15	FEW	1629 ⁵	1 ^N ^MDL	Other Gov
	1630 ⁵	QAS	22	17	15	15	13	FEW	1630 ⁵	1 ^N ^MDL	Other Gov
	1675 ¹	QAS	17	15	13	11	10	FEW	1675 ¹	1 ^N ^MDL	Other Gov
		Notes: ¹- These sites are maintained and operated by Dios Dado for the Capital Area Council of Governments. ²- These sites are maintained and operated by St. Edwards University/CAPCOG. ³- These sites are maintained and operated by Weston Solutions for the Capital Area Council of Governments. ⁴- These sites are maintained and operated by Weston Solutions for CAPCOG. ⁵- These sites are maintained and operated by Weston Solutions, Inc. for CAPCOG. 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