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 Monday, September 15, 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	CAMS	POC	Entity
Dallas-Fort Worth - all times are in CST
	13	34	35	38	27	14	5	2	15	36	49	62	66	69	75	FEW	13	2 ^R ^MDL	TCEQ
	17	38	35	34	34	29	28	21	16	24	37	56	66	68	74	FEW	17	2 ^R ^MDL	TCEQ
	31	36	34	33	33	32	28	23	24	42	49	61	68	78	82	FEW	31	1 ^R ^MDL	TCEQ
	56	31	20	15	14	17	8	5	10	30	42	55	62	69	78	FEW	56	1 ^R ^MDL	TCEQ
	61	31	30	28	26	16	12	12	16	31	45	61	67	67	QAS	QAS	61	1 ^R ^MDL	TCEQ
	63	32	30	26	27	25	20	10	17	32	41	57	65	71	76	FEW	63	1 ^R ^MDL	TCEQ
	69 ¹	31	31	35	35	28	17	15	17	31	40	48	54	54	62	FEW	69 ¹	1 ^R ^MDL	Other Gov
	70	30	27	27	25	20	12	7	QAS	QAS	40	56	68	74	80	FEW	70	1 ^R ^MDL	TCEQ
	71	27	29	30	25	16	3	3	11	28	43	55	46	53	51	FEW	71	1 ^R ^MDL	TCEQ
	73	40	39	36	36	35	33	27	30	41	48	PMA	PMA	61	63	FEW	73	1 ^R ^MDL	TCEQ
	75 ²	33	32	34	34	34	13	22	30	39	48	57	58	59	65	FEW	75 ²	1 ^R ^MDL	TCEQ
	76	49	47	44	40	38	36	38	39	45	49	55	58	59	59	FEW	76	1 ^R ^MDL	TCEQ
	77	36	34	32	31	28	24	14	18	32	51	58	56	56	57	FEW	77	1 ^R ^MDL	TCEQ
	402 ¹	32	32	30	25	23	16	7	12	35	51	58	62	61	63	FEW	402 ¹	1 ^R ^MDL	Other Gov
	1006	21	17	15	12	4	1	0	7	26	45	51	52	55	59	FEW	1006	1 ^R ^MDL	TCEQ
	1032	31	30	26	24	22	16	12	21	37	50	60	63	67	66	FEW	1032	1 ^R ^MDL	TCEQ
	1044	22	18	16	12	8	5	5	15	30	41	55	57	56	55	FEW	1044	1 ^R ^MDL	TCEQ
	1051	31	27	26	26	22	21	12	20	33	47	55	62	61	67	FEW	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