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	CAMS	POC	Entity
Houston-Galveston-Brazoria - all times are in CST
	1	28	27	26	25	22	22	21	21	24	28	31	32	32	32	30	27	23	FEW	1	2 ^R ^MDL	TCEQ
	8	25	25	25	23	22	20	19	20	22	27	31	32	32	32	31	29	24	FEW	8	2 ^R ^MDL	TCEQ
	15	9	11	7	6	4	5	3	2	9	29	31	32	32	31	30	26	15	FEW	15	3 ^R ^MDL	TCEQ
	26	31	30	30	29	27	26	24	24	28	33	39	40	39	39	37	35	32	FEW	26	2 ^R ^MDL	TCEQ
	35	29	29	28	27	27	26	25	25	27	30	31	31	31	30	28	26	24	FEW	35	1 ^R ^MDL	TCEQ
	45	18	19	19	18	17	16	14	11	22	26	28	27	26	25	24	23	21	FEW	45	1 ^R ^MDL	TCEQ
	53	31	30	29	28	28	27	25	28	31	34	36	36	34	33	32	31	28	FEW	53	1 ^R ^MDL	TCEQ
	78	20	19	22	21	18	18	17	17	21	31	40	43	45	45	43	40	38	FEW	78	1 ^R ^MDL	TCEQ
	84	30	28	27	26	26	23	23	25	27	30	31	32	32	31	30	26	24	FEW	84	1 ^R ^MDL	TCEQ
	403 ¹	26	28	25	23	24	20	19	16	21	25	30	29	30	30	29	26	23	FEW	403 ¹	3 ^R ^MDL	Other Gov
	405 ¹	25	24	23	20	17	15	13	15	17	24	PMA	PMA	PMA	29	29	26	21	FEW	405 ¹	1 ^R ^MDL	Other Gov
	406 ¹	28	28	26	26	24	19	20	20	23	QAS	QAS	29	28	30	26	24	21	FEW	406 ¹	1 ^R ^MDL	Other Gov
	408 ¹	29	28	27	25	23	19	18	20	25	31	33	34	33	31	30	28	25	FEW	408 ¹	2 ^R ^MDL	Oth Gov
	409 ¹	29	28	26	25	26	24	23	25	29	32	33	34	31	30	29	28	25	FEW	409 ¹	2 ^R ^MDL	Other Gov
	410 ²	21	20	20	18	17	16	12	12	19	24	25	25	24	24	23	21	20	NA	410 ²	1 ^R ^MDL	Other Gov
	416 ¹	29	29	27	27	26	25	22	21	24	30	32	32	QAS	QAS	QAS	QAS	24	FEW	416 ¹	1 ^R ^MDL	Other Gov
	417 ¹	30	30	29	28	27	26	23	23	25	32	34	35	34	35	33	32	26	FEW	417 ¹	1 ^R ^MDL	Other Gov
	551 ³	10	10	FEW	13	5	5	2	4	23	28	30	29	29	29	26	20	NA	NA	551 ³	1 ^N ^MDL	Oth Gov
	552 ³	21	22	21	20	20	18	13	16	18	23	23	25	26	27	26	26	NA	NA	552 ³	1 ^N ^MDL	Oth Gov
	553 ³	20	20	20	17	17	16	17	18	25	29	31	32	32	30	27	24	NA	NA	553 ³	1 ^N ^MDL	Oth Gov
	554 ³	25	24	23	22	21	19	20	24	29	32	32	32	31	30	28	26	NA	NA	554 ³	1 ^N ^MDL	Oth Gov
	556 ⁴	19	23	23	12	12	12	9	7	9	22	24	24	25	27	13	23	NA	NA	556 ⁴	1 ^N ^MDL	Other Gov
	557 ³	26	23	23	23	21	20	17	22	27	33	35	37	36	37	35	30	NA	NA	557 ³	1 ^N ^MDL	Oth Gov
	558 ³	26	25	24	25	24	23	24	25	29	30	30	30	30	29	26	23	NA	NA	558 ³	1 ^N ^MDL	Oth Gov
	559 ³	26	25	24	22	18	15	17	21	26	30	31	31	29	29	27	26	NA	NA	559 ³	1 ^N ^MDL	Oth Gov
	560 ³	11	13	16	19	15	8	6	11	23	27	29	30	30	30	28	23	NA	NA	560 ³	1 ^N ^MDL	Oth Gov
	561 ³	25	23	22	21	20	19	18	23	28	32	35	35	32	31	30	28	NA	NA	561 ³	1 ^N ^MDL	Oth Gov
	563 ³	26	25	23	21	21	21	21	21	26	31	35	35	36	35	32	29	NA	NA	563 ³	1 ^N ^MDL	Oth Gov
	695 ⁵	27	27	NOD	25	24	24	23	23	24	31	32	33	32	33	32	29	24	NA	695 ⁵	1 ^N ^MDL	Other Gov
	698 ⁵	30	29	28	QAS	21	23	20	20	23	31	38	41	43	42	39	36	34	NA	698 ⁵	1 ^N ^MDL	Oth Gov
	1015	7	6	6	4	5	8	3	3	8	19	31	31	31	30	27	19	9	FEW	1015	1 ^R ^MDL	TCEQ
	1016	34	34	33	34	34	33	33	35	34	34	35	34	33	31	30	29	30	FEW	1016	1 ^R ^MDL	TCEQ
	1017	33	33	33	31	30	29	28	25	28	35	37	36	37	38	36	36	34	FEW	1017	1 ^R ^MDL	TCEQ
	1034	32	29	30	30	30	30	31	32	31	31	31	30	31	36	40	28	26	FEW	1034	1 ^R ^MDL	TCEQ
	1626 ⁵	29	30	30	28	27	26	22	24	26	30	31	31	31	30	30	27	25	NA	1626 ⁵	1 ^N ^MDL	Other Gov
		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 University of Houston. 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