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.

Select a date:	Time Format:	Select a Parameter:


Highlight validated data (Validated data has been manually reviewed by a data validator)
Select a Region:

Region	CAMS	Morning												Afternoon	CAMS	POC	Entity
Ozone Hourly Averages for Monday, December 8, 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
Houston-Galveston-Brazoria - all times are in CST
	1	21	21	20	20	16	9	8	8	10	11	14	16	FEW	1	2 ^R ^MDL	TCEQ
	8	24	24	23	23	22	19	17	16	13	16	18	21	FEW	8	2 ^R ^MDL	TCEQ
	15	23	22	23	22	21	19	19	17	16	18	18	21	FEW	15	3 ^R ^MDL	TCEQ
	26	24	21	21	20	19	17	14	12	11	13	15	17	FEW	26	2 ^R ^MDL	TCEQ
	35	21	21	22	24	23	22	20	18	19	19	21	23	FEW	35	1 ^R ^MDL	TCEQ
	45	17	20	19	16	16	16	13	10	11	14	16	19	FEW	45	1 ^R ^MDL	TCEQ
	53	22	24	23	22	20	20	17	14	15	17	17	19	FEW	53	1 ^R ^MDL	TCEQ
	78	21	21	21	18	17	16	16	15	14	14	16	19	FEW	78	1 ^R ^MDL	TCEQ
	84	21	24	24	23	22	19	16	15	15	16	18	19	FEW	84	1 ^R ^MDL	TCEQ
	403 ¹	21	22	21	21	18	17	14	13	17	17	19	19	FEW	403 ¹	3 ^R ^MDL	Other Gov
	405 ¹	21	22	22	20	18	15	14	11	13	14	16	18	FEW	405 ¹	1 ^R ^MDL	Other Gov
	406 ¹	19	22	21	22	19	14	11	12	12	QAS	QAS	18	FEW	406 ¹	1 ^R ^MDL	Other Gov
	408 ¹	21	21	20	19	17	14	8	7	7	9	13	15	FEW	408 ¹	2 ^R ^MDL	Other Gov
	409 ¹	22	23	22	20	20	19	15	14	15	15	16	18	FEW	409 ¹	2 ^R ^MDL	Other Gov
	410 ²	23	24	23	21	18	17	18	16	16	16	17	19	FEW	410 ²	1 ^R ^MDL	Other Gov
	416 ¹	21	22	23	22	18	15	12	12	13	15	16	18	FEW	416 ¹	1 ^R ^MDL	Other Gov
	417 ¹	23	24	24	23	21	18	15	14	14	13	16	19	FEW	417 ¹	1 ^R ^MDL	Other Gov
	551 ³	20	21	21	22	22	20	19	17	17	18	18	19	NA	551 ³	1 ^N ^MDL	Oth Gov
	552 ³	24	23	24	23	21	19	18	17	15	18	19	22	NA	552 ³	1 ^N ^MDL	Oth Gov
	553 ³	20	21	23	22	20	19	18	18	17	17	18	19	NA	553 ³	1 ^N ^MDL	Oth Gov
	554 ³	24	24	22	21	19	18	16	15	11	13	16	17	NA	554 ³	1 ^N ^MDL	Oth Gov
	556 ⁴	22	23	20	21	19	19	18	15	16	17	20	21	NA	556 ⁴	1 ^N ^MDL	Other Gov
	557 ³	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	557 ³	1 ^N ^MDL	Oth Gov
	558 ³	24	25	26	24	24	21	18	16	18	18	20	20	NA	558 ³	1 ^N ^MDL	Oth Gov
	559 ³	22	21	16	14	14	12	8	8	9	10	14	16	NA	559 ³	1 ^N ^MDL	Oth Gov
	560 ³	23	23	24	22	20	17	16	16	18	17	19	20	NA	560 ³	1 ^N ^MDL	Oth Gov
	561 ³	21	22	20	21	19	18	16	14	14	15	17	17	NA	561 ³	1 ^N ^MDL	Oth Gov
	562 ³	19	20	19	18	17	15	12	12	10	11	14	16	NA	562 ³	1 ^N ^MDL	Oth Gov
	563 ³	21	21	23	21	20	19	19	16	16	16	17	18	NA	563 ³	1 ^N ^MDL	Oth Gov
	1015	20	20	21	23	18	15	17	15	15	15	17	20	FEW	1015	1 ^R ^MDL	TCEQ
	1016	21	21	22	20	19	18	14	11	12	16	22	23	FEW	1016	1 ^R ^MDL	TCEQ
	1017	21	22	23	22	21	19	19	18	18	19	20	23	FEW	1017	1 ^R ^MDL	TCEQ
	1034	24	22	23	23	23	22	23	22	22	23	22	24	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. ³- These sites are maintained and operated by the Harris County Pollution Control Services Department. ⁴- These sites are maintained and operated by the Harris County. 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.
		^N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used 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