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
San Antonio - all times are in CST
	23	24	21	21	23	22	22	21	19	19	20	22	24	25	27	30	32	32	33	NA	23	2 ^R ^MDL	TCEQ
	58	26	25	24	23	23	23	23	20	20	21	23	25	26	29	31	33	33	34	NA	58	1 ^R ^MDL	TCEQ
	59	25	24	25	24	24	22	21	20	21	23	24	25	26	29	30	32	34	33	NA	59	1 ^R ^MDL	TCEQ
	501 ¹	22	21	21	21	19	19	18	18	18	20	20	21	23	24	25	28	29	31	NA	501 ¹	1 ^N ^MDL	Oth Gov
	502 ¹	22	20	19	19	19	19	19	17	16	17	19	20	21	23	26	27	28	28	NA	502 ¹	1 ^N ^MDL	Oth Gov
	503 ¹	19	18	18	17	17	17	17	15	QAS	QAS	12	16	18	19	22	23	25	26	NA	503 ¹	1 ^N ^MDL	TCEQ
	504 ¹	19	18	17	19	19	18	17	17	18	19	21	22	24	25	24	25	25	24	NA	504 ¹	1 ^N ^MDL	TCEQ
	505 ²	20	19	17	18	18	19	15	13	14	17	19	21	22	24	25	26	27	27	NA	505 ²	1 ^N ^MDL	Other Gov
	506 ¹	24	23	23	23	24	24	23	22	22	23	24	24	26	27	27	27	28	26	NA	506 ¹	1 ^N ^MDL	TCEQ
	622 ³	22	21	22	21	21	20	19	18	18	19	20	22	23	26	27	29	31	30	NA	622 ³	1 ^N ^MDL	TCEQ
	678 ³	14	13	13	14	14	14	11	12	13	14	14	16	17	19	20	20	20	20	NA	678 ³	1 ^N	TCEQ
	1610 ³	18	15	15	15	16	15	14	14	14	14	16	17	18	19	19	21	24	25	NA	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