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.

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Region	CAMS	Morning												Afternoon							CAMS	POC	Entity
Ozone Hourly Averages for Thursday, March 23, 2023. measured in parts per billion
Region	CAMS	Mid	1:00	2:00	3:00	4:00	5:00	6:00	7:00	8:00	9:00	10:00	11:00	Noon	1:00	2:00	3:00	4:00	5:00	6:00	CAMS	POC	Entity
Austin - all times are in CST
	3	25	25	24	23	23	23	20	21	22	23	25	26	29	31	29	26	26	25	FEW	3	2 ^R ^MDL	TCEQ
	38	21	21	22	22	20	21	22	21	21	23	25	27	30	33	32	29	28	28	FEW	38	1 ^R ^MDL	TCEQ
	614 ¹	21	19	19	18	18	18	18	17	17	17	19	21	23	25	25	25	24	25	FEW	614 ¹	1 ^N ^MDL	TCEQ
	690 ¹	23	22	22	22	22	21	21	20	19	21	24	26	29	31	32	29	27	26	FEW	690 ¹	1 ^N ^MDL	TCEQ
	1604 ¹	24	23	22	21	21	23	23	22	23	23	25	25	26	26	26	26	25	26	FEW	1604 ¹	1 ^N ^MDL	TCEQ
	1605 ²	23	22	21	19	18	18	18	18	19	21	23	24	26	27	25	23	23	21	FEW	1605 ²	1 ^N ^MDL	Private
	1612 ¹	24	23	23	22	23	23	22	21	22	25	26	26	25	24	24	22	22	24	FEW	1612 ¹	1 ^N ^MDL	TCEQ
	1613 ¹	23	24	23	22	21	22	22	20	21	24	25	25	24	24	24	22	22	21	FEW	1613 ¹	1 ^N ^MDL	TCEQ
	1619 ³	29	29	28	26	25	24	25	23	24	27	29	30	32	34	33	30	30	28	FEW	1619 ³	1 ^N ^MDL	Other Gov
	1620 ³	26	27	26	25	23	21	21	21	23	25	27	28	29	32	32	29	28	25	FEW	1620 ³	1 ^N ^MDL	Other Gov
	1675 ⁴	24	22	22	22	22	23	22	21	22	23	25	26	27	29	29	28	29	28	FEW	1675 ⁴	1 ^N ^MDL	Other Gov
		Notes: ¹- These sites are maintained and operated by Weston Solutions, Inc. 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 CAPCOG. ⁴- These sites are maintained and operated by Dios Dado for the Capital Area Council of Governments. 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