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 Monday, September 22, 2025. measured in parts per billion
Region	CAMS	Mid	1:00	CAMS	POC	Entity
Houston-Galveston-Brazoria - all times are in CST
	1	12	FEW	1	2 ^R ^MDL	TCEQ
	8	8	4	8	2 ^R ^MDL	TCEQ
	15	22	25	15	3 ^R ^MDL	TCEQ
	26	10	FEW	26	2 ^R ^MDL	TCEQ
	35	22	FEW	35	1 ^R ^MDL	TCEQ
	45	22	FEW	45	1 ^R ^MDL	TCEQ
	53	24	FEW	53	1 ^R ^MDL	TCEQ
	78	14	FEW	78	1 ^R ^MDL	TCEQ
	84	12	6	84	1 ^R ^MDL	TCEQ
	403 ¹	13	FEW	403 ¹	3 ^R ^MDL	Other Gov
	405 ¹	4	FEW	405 ¹	1 ^R ^MDL	Other Gov
	406 ¹	10	FEW	406 ¹	1 ^R ^MDL	Other Gov
	408 ¹	20	FEW	408 ¹	2 ^R ^MDL	Other Gov
	409 ¹	20	FEW	409 ¹	2 ^R ^MDL	Other Gov
	410 ²	17	FEW	410 ²	1 ^R ^MDL	Other Gov
	416 ¹	12	FEW	416 ¹	1 ^R ^MDL	Other Gov
	417 ¹	26	FEW	417 ¹	1 ^R ^MDL	Other Gov
	1015	19	20	1015	1 ^R ^MDL	TCEQ
	1016	12	FEW	1016	1 ^R ^MDL	TCEQ
	1017	29	FEW	1017	1 ^R ^MDL	TCEQ
	1034	35	FEW	1034	1 ^R ^MDL	TCEQ
		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. 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