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 Sunday, November 30, 2025. 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	7:00	8:00	CAMS	POC	Entity
Houston-Galveston-Brazoria - all times are in CST
	1	25	23	31	35	20	15	15	14	13	11	9	9	10	12	12	12	11	12	12	13	NA	1	2 ^R ^MDL	TCEQ
	8	13	22	37	29	18	19	17	17	15	13	12	13	15	17	17	17	17	16	17	17	NA	8	2 ^R ^MDL	TCEQ
	15	36	32	38	38	21	14	18	17	16	14	11	11	12	15	16	16	16	16	17	17	NA	15	3 ^R ^MDL	TCEQ
	26	21	28	24	18	18	18	17	15	14	14	15	16	17	19	20	20	20	18	20	20	NA	26	2 ^R ^MDL	TCEQ
	35	31	29	31	39	28	17	16	16	16	15	14	11	12	15	15	16	15	16	15	14	NA	35	1 ^R ^MDL	TCEQ
	45	29	28	22	32	29	12	11	9	11	8	10	7	6	7	9	9	9	9	9	9	NA	45	1 ^R ^MDL	TCEQ
	53	27	30	33	37	19	17	18	17	16	14	12	12	14	15	17	17	17	16	16	15	NA	53	1 ^R ^MDL	TCEQ
	78	37	36	19	19	19	18	17	14	14	14	16	17	18	19	20	20	20	21	20	21	NA	78	1 ^R ^MDL	TCEQ
	84	24	26	25	32	29	15	15	15	15	13	11	10	10	12	13	13	13	13	14	13	NA	84	1 ^R ^MDL	TCEQ
	403 ¹	26	25	31	37	21	16	16	16	14	13	10	10	12	13	15	15	15	15	15	15	NA	403 ¹	3 ^R ^MDL	Other Gov
	405 ¹	17	21	34	33	16	16	17	15	14	12	9	11	11	14	15	16	15	15	15	15	NA	405 ¹	1 ^R ^MDL	Other Gov
	406 ¹	24	25	27	36	26	14	16	15	14	12	10	8	9	11	12	13	12	11	11	11	NA	406 ¹	1 ^R ^MDL	Other Gov
	408 ¹	27	24	34	28	16	16	15	15	13	11	10	10	12	14	13	14	14	14	15	15	NA	408 ¹	2 ^R ^MDL	Other Gov
	410 ²	24	24	29	28	18	18	18	17	15	13	13	14	16	17	18	18	18	17	18	18	NA	410 ²	1 ^R ^MDL	Other Gov
	416 ¹	26	27	29	36	22	15	17	16	15	13	10	9	11	13	13	14	14	14	14	14	NA	416 ¹	1 ^R ^MDL	Other Gov
	417 ¹	30	27	35	35	18	18	18	17	16	13	12	12	14	15	17	17	16	15	15	16	NA	417 ¹	1 ^R ^MDL	Other Gov
	551 ³	22	20	29	31	17	14	14	13	13	11	10	10	11	13	14	15	14	15	15	15	NA	551 ³	1 ^N ^MDL	Oth Gov
	552 ³	24	23	28	37	31	17	16	16	14	13	12	11	11	13	14	15	14	14	14	14	NA	552 ³	1 ^N ^MDL	Oth Gov
	553 ³	22	23	33	32	15	14	14	14	12	11	9	9	11	13	14	15	15	15	15	15	NA	553 ³	1 ^N ^MDL	Oth Gov
	554 ³	27	25	31	23	17	18	18	17	14	13	13	14	16	17	18	18	17	17	18	18	NA	554 ³	1 ^N ^MDL	Oth Gov
	556 ⁴	31	31	25	37	32	16	15	16	15	15	14	12	8	11	15	15	16	15	14	14	NA	556 ⁴	1 ^N ^MDL	Other Gov
	557 ³	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	557 ³	1 ^N ^MDL	Oth Gov
	558 ³	25	26	27	31	27	11	12	12	10	9	8	5	6	8	9	11	12	12	12	11	NA	558 ³	1 ^N ^MDL	Oth Gov
	559 ³	23	22	32	19	18	17	17	15	14	14	13	13	16	18	19	19	19	19	18	19	NA	559 ³	1 ^N ^MDL	Oth Gov
	560 ³	20	24	30	27	15	16	16	14	14	12	12	13	14	16	17	18	17	17	18	18	NA	560 ³	1 ^N ^MDL	Oth Gov
	561 ³	9	26	31	17	16	16	16	14	11	11	12	13	15	16	17	17	18	18	19	19	NA	561 ³	1 ^N ^MDL	Oth Gov
	562 ³	24	19	23	28	14	14	13	13	12	10	9	10	11	13	14	14	14	14	14	15	NA	562 ³	1 ^N ^MDL	Oth Gov
	563 ³	19	36	36	28	18	17	17	16	15	12	11	12	14	15	16	16	17	17	16	17	NA	563 ³	1 ^N ^MDL	Oth Gov
	1015	32	28	33	40	22	14	14	13	13	13	9	8	9	12	13	13	13	14	15	13	NA	1015	1 ^R ^MDL	TCEQ
	1016	35	36	35	35	35	35	18	15	14	14	14	12	10	10	11	12	12	12	12	11	NA	1016	1 ^R ^MDL	TCEQ
	1017	32	30	39	42	24	18	18	18	16	15	13	12	13	14	15	16	16	15	15	16	NA	1017	1 ^R ^MDL	TCEQ
	1034	42	41	41	40	38	42	21	17	19	19	18	18	19	17	14	14	15	14	14	13	NA	1034	1 ^R ^MDL	TCEQ
		Notes: ¹- These sites are maintained and operated by the City of Houston. ²- These sites are maintained and operated by the City of Houston Health Department. ³- These sites are maintained and operated by the Harris County Pollution Control Services Department. ⁴- These sites are maintained and operated by the Harris County. 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