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.

Use the controls below to select a different date or parameter. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.

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Highlight validated data (Validated data has been manually reviewed by a data validator)
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Region	CAMS	Morning			CAMS	POC	Entity
Ozone Hourly Averages for Friday, October 17, 2025. measured in parts per billion
Region	CAMS	Mid	1:00	2:00	CAMS	POC	Entity
Dallas-Fort Worth - all times are in CST
	13	58	FEW	NA	13	2 ^R ^MDL	TCEQ
	17	42	FEW	NA	17	2 ^R ^MDL	TCEQ
	31	27	26	NA	31	1 ^R ^MDL	TCEQ
	56	23	18	NA	56	1 ^R ^MDL	TCEQ
	61	37	32	NA	61	1 ^R ^MDL	TCEQ
	63	32	37	NA	63	1 ^R ^MDL	TCEQ
	69 ¹	42	FEW	NA	69 ¹	1 ^R ^MDL	Other Gov
	70	38	41	NA	70	1 ^R ^MDL	TCEQ
	71	34	FEW	NA	71	1 ^R ^MDL	TCEQ
	73	50	47	NA	73	1 ^R ^MDL	TCEQ
	75 ²	PMA	PMA	NA	75 ²	1 ^R ^MDL	TCEQ
	76	55	FEW	NA	76	1 ^R ^MDL	TCEQ
	77	45	FEW	NA	77	1 ^R ^MDL	TCEQ
	402 ¹	38	37	NA	402 ¹	1 ^R ^MDL	Other Gov
	1006	34	FEW	NA	1006	1 ^R ^MDL	TCEQ
	1032	30	FEW	NA	1032	1 ^R ^MDL	TCEQ
	1044	31	FEW	NA	1044	1 ^R ^MDL	TCEQ
	1051	38	38	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