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 Thursday, April 25, 2024. 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	1:00	2:00	3:00	4:00	5:00	CAMS	POC	Entity
Houston-Galveston-Brazoria - all times are in CST
	1	28	24	21	22	27	24	21	23	26	28	30	32	33	33	33	32	28	NA	1	2 ^R ^MDL	TCEQ
	8	26	24	13	15	15	12	20	17	18	26	25	29	33	33	32	32	28	NA	8	2 ^R ^MDL	TCEQ
	15	30	28	11	11	11	13	25	25	21	26	25	27	30	30	27	27	28	NA	15	3 ^R ^MDL	TCEQ
	26	28	25	23	20	18	25	23	19	21	23	25	31	36	35	31	31	29	NA	26	2 ^R ^MDL	TCEQ
	35	29	27	23	28	30	26	24	26	28	30	31	31	33	33	32	31	30	NA	35	1 ^R ^MDL	TCEQ
	45	27	28	26	24	23	24	26	26	26	28	29	29	30	30	30	30	28	NA	45	1 ^R ^MDL	TCEQ
	53	31	30	30	29	25	26	25	27	28	30	33	35	35	34	34	33	31	NA	53	1 ^R ^MDL	TCEQ
	78	21	14	13	12	12	12	14	15	18	23	24	31	41	46	48	45	40	NA	78	1 ^R ^MDL	TCEQ
	84	25	23	24	16	14	23	20	24	26	27	29	30	31	30	30	30	28	NA	84	1 ^R ^MDL	TCEQ
	403 ¹	20	25	29	26	22	18	18	18	16	21	22	24	27	24	26	25	23	NA	403 ¹	3 ^R ^MDL	Other Gov
	405 ¹	22	18	16	16	18	14	12	18	22	24	24	26	32	31	30	30	28	NA	405 ¹	1 ^R ^MDL	Other Gov
	406 ¹	25	24	24	24	23	20	15	21	24	26	26	27	30	28	28	27	26	NA	406 ¹	1 ^R ^MDL	Other Gov
	408 ¹	30	30	27	22	24	23	18	20	22	23	28	30	33	32	32	31	26	NA	408 ¹	2 ^R ^MDL	Oth Gov
	409 ¹	27	27	27	26	25	24	22	25	27	28	30	31	32	30	31	30	29	NA	409 ¹	2 ^R ^MDL	Other Gov
	410 ²	33	34	32	30	31	29	26	26	27	29	32	35	35	34	34	32	30	NA	410 ²	1 ^R ^MDL	Other Gov
	416 ¹	31	29	29	30	24	26	21	24	28	31	30	33	34	33	33	32	30	NA	416 ¹	1 ^R ^MDL	Other Gov
	417 ¹	28	27	26	27	27	24	20	20	PMA	PMA	PMA	PMA	33	32	32	30	27	NA	417 ¹	1 ^R ^MDL	Other Gov
	551 ³	13	10	6	9	5	8	12	14	15	18	20	25	27	23	24	27	NA	NA	551 ³	1 ^N ^MDL	Oth Gov
	552 ³	22	19	24	23	26	24	21	24	28	31	33	32	PMA	29	26	26	NA	NA	552 ³	1 ^N ^MDL	Oth Gov
	553 ³	19	15	17	15	13	17	20	22	26	30	33	35	29	33	31	29	NA	NA	553 ³	1 ^N ^MDL	Oth Gov
	554 ³	29	28	25	28	26	24	23	23	26	28	33	36	34	34	32	30	NA	NA	554 ³	1 ^N ^MDL	Oth Gov
	556 ⁴	32	31	30	32	30	24	26	30	31	32	27	26	26	29	30	26	NA	NA	556 ⁴	1 ^N ^MDL	Other Gov
	557 ³	18	13	7	10	5	3	3	8	17	21	25	31	32	34	31	30	NA	NA	557 ³	1 ^N ^MDL	Oth Gov
	558 ³	25	25	26	26	24	23	26	28	30	32	33	34	34	34	32	31	NA	NA	558 ³	1 ^N ^MDL	Oth Gov
	559 ³	25	25	23	24	21	20	22	22	23	28	31	33	31	32	30	30	NA	NA	559 ³	1 ^N ^MDL	Oth Gov
	560 ³	18	14	11	9	4	4	16	21	24	25	27	34	36	34	32	32	NA	NA	560 ³	1 ^N ^MDL	Oth Gov
	561 ³	20	20	15	11	13	16	17	20	21	24	30	33	33	32	32	30	NA	NA	561 ³	1 ^N ^MDL	Oth Gov
	562 ³	26	24	22	24	23	21	23	24	25	28	32	33	32	32	31	28	NA	NA	562 ³	1 ^N ^MDL	Oth Gov
	563 ³	17	14	14	11	11	12	11	13	16	23	28	33	34	31	28	31	NA	NA	563 ³	1 ^N ^MDL	Oth Gov
	695 ⁵	31	29	26	23	27	26	21	21	24	27	30	32	32	32	32	30	28	NA	695 ⁵	1 ^N ^MDL	Other Gov
	698 ⁵	20	22	15	9	8	4	2	6	9	16	18	26	37	40	43	39	34	NA	698 ⁵	1 ^N ^MDL	Oth Gov
	1015	28	27	26	25	22	26	28	26	28	32	31	31	34	36	35	36	33	NA	1015	1 ^R ^MDL	TCEQ
	1016	38	37	37	35	34	32	32	32	32	32	32	32	32	32	32	31	30	NA	1016	1 ^R ^MDL	TCEQ
	1017	36	29	20	20	25	27	27	29	29	32	34	37	36	35	33	31	28	NA	1017	1 ^R ^MDL	TCEQ
	1034	45	43	43	40	41	40	41	41	39	39	38	36	36	39	38	36	34	NA	1034	1 ^R ^MDL	TCEQ
	1626 ⁵	24	17	NOD	14	17	17	15	18	20	24	26	27	29	29	28	27	27	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