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, January 4, 2026. 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	CAMS	POC	Entity
Houston-Galveston-Brazoria - all times are in CST
	1	20	19	18	18	18	19	27	29	24	29	34	37	42	44	46	FEW	NA	1	2 ^R ^MDL	TCEQ
	8	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	PMA	LIM	LIM	LIM	LIM	LIM	LIM	NA	8	2 ^R ^MDL	TCEQ
	15	26	24	22	23	22	27	32	31	31	35	40	41	44	45	47	49	NA	15	3 ^R ^MDL	TCEQ
	26	17	19	22	21	18	17	16	10	15	28	33	34	36	37	44	FEW	NA	26	2 ^R ^MDL	TCEQ
	35	19	24	21	16	17	22	25	27	31	37	40	42	44	46	47	FEW	NA	35	1 ^R ^MDL	TCEQ
	45	20	20	19	19	21	21	22	27	31	33	35	36	39	42	43	FEW	NA	45	1 ^R ^MDL	TCEQ
	53	22	27	26	25	26	25	24	28	27	25	27	39	47	49	48	FEW	NA	53	1 ^R ^MDL	TCEQ
	78	18	19	16	10	12	13	13	13	14	25	32	34	35	37	37	FEW	NA	78	1 ^R ^MDL	TCEQ
	84	24	24	25	20	18	16	18	19	23	28	37	42	43	46	48	FEW	NA	84	1 ^R ^MDL	TCEQ
	403 ¹	21	20	17	18	17	18	24	28	24	27	32	37	38	41	42	FEW	NA	403 ¹	3 ^R ^MDL	Other Gov
	405 ¹	21	23	22	21	22	20	22	29	26	30	32	36	39	44	44	FEW	NA	405 ¹	1 ^R ^MDL	Other Gov
	406 ¹	20	23	20	16	18	18	17	20	22	29	35	37	39	40	42	FEW	NA	406 ¹	1 ^R ^MDL	Other Gov
	408 ¹	18	23	24	21	22	14	10	8	14	28	30	34	40	50	48	FEW	NA	408 ¹	2 ^R ^MDL	Other Gov
	409 ¹	21	25	27	26	24	24	22	22	22	24	32	43	46	48	49	FEW	NA	409 ¹	2 ^R ^MDL	Other Gov
	410 ²	23	23	26	25	23	22	18	15	19	25	26	30	42	48	50	FEW	NA	410 ²	1 ^R ^MDL	Other Gov
	416 ¹	23	21	21	18	19	20	21	24	22	26	35	39	43	43	43	FEW	NA	416 ¹	1 ^R ^MDL	Other Gov
	417 ¹	23	24	23	23	22	23	24	26	29	28	32	38	46	47	50	FEW	NA	417 ¹	1 ^R ^MDL	Other Gov
	551 ³	18	16	13	15	16	21	28	29	30	32	34	36	39	40	42	NA	NA	551 ³	1 ^N ^MDL	Oth Gov
	552 ³	21	23	21	22	24	26	28	29	35	38	40	40	41	43	43	NA	NA	552 ³	1 ^N ^MDL	Oth Gov
	553 ³	15	14	14	14	18	27	30	30	32	33	33	34	37	42	42	NA	NA	553 ³	1 ^N ^MDL	Oth Gov
	554 ³	21	24	24	23	22	20	15	6	14	25	30	32	36	44	54	NA	NA	554 ³	1 ^N ^MDL	Oth Gov
	556 ⁴	19	18	22	17	22	25	26	28	32	36	38	38	40	43	45	NA	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	NA	NA	557 ³	1 ^N ^MDL	Oth Gov
	558 ³	25	24	25	23	19	20	20	20	25	30	39	43	46	47	48	NA	NA	558 ³	1 ^N ^MDL	Oth Gov
	559 ³	18	21	21	22	23	20	16	11	16	25	23	28	31	38	46	NA	NA	559 ³	1 ^N ^MDL	Oth Gov
	560 ³	20	19	18	16	16	10	8	8	8	18	30	31	33	37	45	NA	NA	560 ³	1 ^N ^MDL	Oth Gov
	561 ³	19	18	17	16	15	14	12	8	11	22	32	31	32	38	44	NA	NA	561 ³	1 ^N ^MDL	Oth Gov
	562 ³	19	22	23	21	20	19	13	10	14	25	25	30	40	45	47	NA	NA	562 ³	1 ^N ^MDL	Oth Gov
	563 ³	23	23	21	19	22	14	13	9	11	20	30	33	37	39	40	NA	NA	563 ³	1 ^N ^MDL	Oth Gov
	1015	17	18	21	13	18	25	29	31	33	36	39	39	43	45	47	FEW	NA	1015	1 ^R ^MDL	TCEQ
	1016	17	17	15	17	14	16	17	17	19	20	24	31	37	41	43	44	NA	1016	1 ^R ^MDL	TCEQ
	1017	20	21	21	20	22	31	32	34	35	36	39	40	41	43	45	46	NA	1017	1 ^R ^MDL	TCEQ
	1034	25	24	21	28	24	21	17	19	27	25	40	41	40	42	40	40	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