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, March 1, 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	CAMS	POC	Entity
Houston-Galveston-Brazoria - all times are in CST
	1	28	29	29	28	27	27	26	27	32	39	44	46	51	56	56	FEW	1	2 ^R ^MDL	TCEQ
	8	28	30	31	20	22	20	17	21	33	40	50	51	55	61	62	FEW	8	2 ^R ^MDL	TCEQ
	15	23	22	32	16	14	7	5	13	31	33	43	46	52	53	52	FEW	15	3 ^R ^MDL	TCEQ
	26	34	32	30	28	25	19	21	18	27	39	47	51	54	56	57	FEW	26	2 ^R ^MDL	TCEQ
	35	29	33	35	37	37	38	36	33	38	42	46	50	54	56	55	FEW	35	1 ^R ^MDL	TCEQ
	45	23	16	15	25	23	23	24	27	28	32	38	43	44	43	43	FEW	45	1 ^R ^MDL	TCEQ
	53	32	32	33	33	32	31	28	29	37	42	45	49	52	53	51	FEW	53	1 ^R ^MDL	TCEQ
	78	31	29	28	27	26	25	30	19	24	34	43	52	58	58	59	FEW	78	1 ^R ^MDL	TCEQ
	84	32	32	37	37	34	30	31	39	41	46	51	54	56	56	54	FEW	84	1 ^R ^MDL	TCEQ
	403 ¹	25	28	22	28	27	26	24	32	32	36	39	44	48	52	52	FEW	403 ¹	3 ^R ^MDL	Other Gov
	405 ¹	24	25	19	20	16	18	14	20	31	38	43	43	49	54	55	FEW	405 ¹	1 ^R ^MDL	Other Gov
	406 ¹	26	29	31	31	33	33	31	32	34	38	41	44	46	47	47	FEW	406 ¹	1 ^R ^MDL	Other Gov
	408 ¹	30	31	29	29	34	25	17	25	34	38	45	48	51	52	51	FEW	408 ¹	2 ^R ^MDL	Other Gov
	409 ¹	34	34	37	34	35	35	31	33	41	43	48	52	54	55	53	FEW	409 ¹	2 ^R ^MDL	Other Gov
	410 ²	33	34	34	31	29	25	24	28	34	43	48	51	51	54	53	FEW	410 ²	1 ^R ^MDL	Other Gov
	416 ¹	30	33	34	34	36	36	34	33	38	41	44	49	50	51	52	FEW	416 ¹	1 ^R ^MDL	Other Gov
	417 ¹	29	32	34	35	36	33	36	34	39	41	47	51	52	53	55	FEW	417 ¹	1 ^R ^MDL	Other Gov
	551 ³	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	551 ³	1 ^N ^MDL	Oth Gov
	552 ³	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	552 ³	1 ^N ^MDL	Oth Gov
	553 ³	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	553 ³	1 ^N ^MDL	Oth Gov
	554 ³	35	34	31	30	25	21	21	23	31	40	46	50	54	56	57	NA	554 ³	1 ^N ^MDL	Oth Gov
	556 ⁴	24	29	31	33	31	31	32	32	31	34	38	43	45	45	45	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	557 ³	1 ^N ^MDL	Oth Gov
	558 ³	31	36	37	36	39	39	40	41	43	45	51	54	55	56	55	NA	558 ³	1 ^N ^MDL	Oth Gov
	559 ³	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	559 ³	1 ^N ^MDL	Oth Gov
	560 ³	24	21	20	16	12	7	6	13	23	26	39	49	49	49	50	NA	560 ³	1 ^N ^MDL	Oth Gov
	561 ³	26	28	27	21	20	20	13	15	22	36	46	53	54	59	60	NA	561 ³	1 ^N ^MDL	Oth Gov
	562 ³	31	31	30	31	29	28	21	21	34	39	45	47	51	52	54	NA	562 ³	1 ^N ^MDL	Oth Gov
	563 ³	32	33	29	23	16	14	11	24	31	32	43	50	50	51	51	NA	563 ³	1 ^N ^MDL	Oth Gov
	1015	30	24	20	27	22	24	26	29	32	34	44	46	53	54	53	FEW	1015	1 ^R ^MDL	TCEQ
	1016	36	35	33	33	34	31	27	30	37	45	48	50	50	50	50	FEW	1016	1 ^R ^MDL	TCEQ
	1017	32	34	33	35	33	30	27	26	32	40	48	50	52	52	51	FEW	1017	1 ^R ^MDL	TCEQ
	1034	35	40	40	35	38	37	38	31	27	39	57	63	67	56	51	FEW	1034	1 ^R ^MDL	TCEQ
	1607 ⁵	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	1607 ⁵	1 ^N ^MDL	Private
		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. ⁵- These sites are maintained and operated by AECOM. 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