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 Wednesday, September 27, 2023. 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	19	6	1	1	1	1	1	3	20	39	51	FEW	NA	1	2 ^R ^MDL	TCEQ
	8	4	2	1	1	1	1	1	4	18	39	52	60	NA	8	2 ^R ^MDL	TCEQ
	15	11	4	2	2	0	0	1	6	18	36	52	61	NA	15	3 ^R ^MDL	TCEQ
	26	2	2	1	1	1	1	1	8	28	44	52	FEW	NA	26	2 ^R ^MDL	TCEQ
	35	27	22	16	13	9	2	2	7	21	41	54	FEW	NA	35	1 ^R ^MDL	TCEQ
	45	10	7	4	4	8	4	1	6	27	36	46	FEW	NA	45	1 ^R ^MDL	TCEQ
	53	22	14	18	11	4	1	2	16	34	48	59	FEW	NA	53	1 ^R ^MDL	TCEQ
	78	12	11	9	4	4	1	2	9	PMA	PMA	PMA	FEW	NA	78	1 ^R ^MDL	TCEQ
	84	12	3	10	2	0	0	1	12	28	40	52	FEW	NA	84	1 ^R ^MDL	TCEQ
	403 ¹	20	12	7	0	0	0	0	2	13	33	50	FEW	NA	403 ¹	3 ^R ^MDL	Other Gov
	405 ¹	3	0	0	0	0	0	0	3	19	29	43	52	NA	405 ¹	1 ^R ^MDL	Other Gov
	406 ¹	11	8	11	5	1	1	1	7	20	33	44	53	NA	406 ¹	1 ^R ^MDL	Other Gov
	408 ¹	21	21	12	4	0	0	1	3	17	39	56	61	NA	408 ¹	2 ^R ^MDL	Oth Gov
	409 ¹	16	12	11	4	2	1	1	6	24	PMA	48	57	NA	409 ¹	2 ^R ^MDL	Other Gov
	410 ²	22	20	19	12	9	3	2	19	29	37	52	56	NA	410 ²	1 ^R ^MDL	Other Gov
	416 ¹	20	21	19	10	3	2	1	3	QAS	QAS	QAS	66	NA	416 ¹	1 ^R ^MDL	Other Gov
	417 ¹	33	31	29	12	0	0	0	3	23	43	PMA	FEW	NA	417 ¹	1 ^R ^MDL	Other Gov
	551 ³	0	0	0	0	0	0	2	12	32	44	NA	NA	NA	551 ³	1 ^N ^MDL	Oth Gov
	552 ³	14	8	7	6	1	0	2	17	31	42	NA	NA	NA	552 ³	1 ^N ^MDL	Oth Gov
	553 ³	2	0	0	0	0	0	1	15	38	51	NA	NA	NA	553 ³	1 ^N ^MDL	Oth Gov
	554 ³	1	0	0	0	0	0	2	24	40	53	NA	NA	NA	554 ³	1 ^N ^MDL	Oth Gov
	556 ⁴	22	15	8	9	0	1	2	15	30	44	NA	NA	NA	556 ⁴	1 ^N ^MDL	Other Gov
	557 ³	1	0	7	5	1	0	3	23	30	PMA	NA	NA	NA	557 ³	1 ^N ^MDL	Oth Gov
	558 ³	8	11	4	0	0	0	6	23	39	49	NA	NA	NA	558 ³	1 ^N ^MDL	Oth Gov
	559 ³	7	3	2	2	2	1	6	25	39	50	NA	NA	NA	559 ³	1 ^N ^MDL	Oth Gov
	561 ³	3	3	0	0	0	0	3	20	34	51	NA	NA	NA	561 ³	1 ^N ^MDL	Oth Gov
	562 ³	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	NA	NA	562 ³	1 ^N ^MDL	Oth Gov
	563 ³	1	5	1	0	1	0	1	14	33	46	NA	NA	NA	563 ³	1 ^N ^MDL	Oth Gov
	695 ⁵	35	32	NOD	24	5	7	5	3	20	42	55	FEW	NA	695 ⁵	1 ^N ^MDL	Other Gov
	698 ⁵	34	28	37	NOD	5	5	1	4	27	46	54	FEW	NA	698 ⁵	1 ^N ^MDL	Oth Gov
	1015	17	19	0	0	0	0	0	1	17	31	48	FEW	NA	1015	1 ^R ^MDL	TCEQ
	1016	1	1	1	1	3	2	1	8	33	42	46	FEW	NA	1016	1 ^R ^MDL	TCEQ
	1017	7	7	9	11	5	1	1	9	26	42	53	FEW	NA	1017	1 ^R ^MDL	TCEQ
	1034	41	41	42	35	37	32	28	40	46	44	63	70	NA	1034	1 ^R ^MDL	TCEQ
	1606 ⁵	QAS	40	36	18	24	28	30	31	37	49	55	FEW	NA	1606 ⁵	1 ^N ^MDL	TCEQ
	1611 ⁵	30	27	26	QAS	2	0	1	2	20	43	57	FEW	NA	1611 ⁵	1 ^N ^MDL	Other Gov
	1626 ⁵	0	5	1	NOD	-2	-3	-2	4	16	36	46	FEW	NA	1626 ⁵	1 ^N ^MDL	Other Gov
		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. ⁵- These sites are maintained and operated by University of Houston. 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