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 Wednesday, February 25, 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	5:00	6:00	CAMS	POC	Entity
Dallas-Fort Worth - all times are in CST
	13	40	38	35	34	32	29	26	24	24	28	30	37	42	45	48	49	50	FEW	NA	13	2 ^R ^MDL	TCEQ
	17	41	38	35	34	32	29	25	22	23	26	30	34	42	46	50	51	52	FEW	NA	17	2 ^R ^MDL	TCEQ
	31	40	40	38	35	33	31	28	24	25	26	29	34	39	43	48	51	50	FEW	NA	31	1 ^R ^MDL	TCEQ
	56	42	41	37	35	33	31	27	24	25	28	31	37	42	49	54	59	59	FEW	NA	56	1 ^R ^MDL	TCEQ
	61	36	37	35	33	31	28	26	24	25	28	31	35	39	41	43	44	47	48	NA	61	1 ^R ^MDL	TCEQ
	63	40	38	36	33	31	29	26	23	22	24	29	34	37	42	46	49	49	49	NA	63	1 ^R ^MDL	TCEQ
	69 ¹	40	38	35	34	33	30	27	26	26	28	31	34	36	41	43	PMA	49	FEW	NA	69 ¹	1 ^R ^MDL	Other Gov
	70	36	35	34	33	30	25	19	17	22	25	29	34	38	40	47	50	48	48	NA	70	1 ^R ^MDL	TCEQ
	71	42	40	38	37	37	36	35	34	34	35	37	39	42	45	50	53	55	FEW	NA	71	1 ^R ^MDL	TCEQ
	73	42	40	38	37	36	35	32	31	32	34	38	39	PMA	QAS	44	45	48	FEW	NA	73	1 ^R ^MDL	TCEQ
	75 ²	42	42	40	38	36	34	32	28	28	32	37	41	45	48	50	53	54	FEW	NA	75 ²	1 ^R ^MDL	TCEQ
	76	42	41	40	40	36	35	34	33	33	PMA	QAS	QAS	36	39	43	45	48	FEW	NA	76	1 ^R ^MDL	TCEQ
	77	34	33	32	30	25	22	24	21	24	28	32	35	37	41	45	45	45	FEW	NA	77	1 ^R ^MDL	TCEQ
	402 ¹	43	40	38	37	35	33	29	27	28	30	33	37	41	44	47	50	51	50	NA	402 ¹	1 ^R ^MDL	Other Gov
	1006	44	40	38	36	35	33	31	30	31	32	34	37	41	44	47	50	52	FEW	NA	1006	1 ^R ^MDL	TCEQ
	1032	41	38	37	36	33	30	27	24	26	28	29	33	39	47	52	57	59	55	NA	1032	1 ^R ^MDL	TCEQ
	1044	LIM	LIM	LIM	LIM	LIM	LIM	LIM	CAL	CAL	31	33	36	42	48	53	57	58	FEW	NA	1044	1 ^R ^MDL	TCEQ
	1051	40	37	37	37	37	35	34	33	34	35	38	41	44	47	49	51	52	52	NA	1051	1 ^R ^MDL	TCEQ
		Notes: ¹- These sites are maintained and operated by the City of Dallas. ²- These sites are maintained and operated by AECOM for North Texas Commission (NTC). 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.

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