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, May 11, 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	CAMS	POC	Entity
Dallas-Fort Worth - all times are in CST
	13	39	31	34	35	33	31	33	38	43	51	59	FEW	NA	13	2 ^R ^MDL	TCEQ
	17	32	34	32	33	33	32	33	36	42	49	54	FEW	NA	17	2 ^R ^MDL	TCEQ
	31	44	38	43	35	32	34	34	36	40	49	57	FEW	NA	31	1 ^R ^MDL	TCEQ
	56	29	29	33	33	30	27	27	29	36	42	53	FEW	NA	56	1 ^R ^MDL	TCEQ
	61	43	37	37	29	29	30	31	34	39	49	59	FEW	NA	61	1 ^R ^MDL	TCEQ
	63	45	43	41	41	40	37	38	38	42	48	54	FEW	NA	63	1 ^R ^MDL	TCEQ
	69 ¹	40	39	37	33	34	32	35	36	37	46	50	FEW	NA	69 ¹	1 ^R ^MDL	Other Gov
	70	43	41	39	38	32	32	31	33	38	47	56	FEW	NA	70	1 ^R ^MDL	TCEQ
	71	44	45	42	31	31	31	32	37	45	54	61	62	NA	71	1 ^R ^MDL	TCEQ
	73	38	30	30	32	29	27	29	32	43	51	57	FEW	NA	73	1 ^R ^MDL	TCEQ
	75 ²	33	29	30	25	19	8	15	28	35	44	55	FEW	NA	75 ²	1 ^R ^MDL	TCEQ
	76	45	40	42	41	38	38	38	37	48	53	56	FEW	NA	76	1 ^R ^MDL	TCEQ
	77	32	32	25	21	23	27	30	37	44	53	60	FEW	NA	77	1 ^R ^MDL	TCEQ
	402 ¹	46	40	36	35	36	36	32	35	39	49	57	58	NA	402 ¹	1 ^R ^MDL	Other Gov
	1006	45	41	38	36	35	36	36	37	44	51	54	FEW	NA	1006	1 ^R ^MDL	TCEQ
	1032	42	39	40	40	39	38	37	37	41	47	54	FEW	NA	1032	1 ^R ^MDL	TCEQ
	1044	38	38	39	34	29	24	26	28	35	47	56	FEW	NA	1044	1 ^R ^MDL	TCEQ
	1051	35	36	33	35	35	35	34	36	SPZ	44	57	FEW	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