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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Region	CAMS	Morning												Afternoon						CAMS	POC	Entity
Ozone Hourly Averages for Friday, July 18, 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	1:00	2:00	3:00	4:00	5:00	CAMS	POC	Entity
Beaumont-Port Arthur - all times are in CST
	2	14	13	7	6	5	3	5	6	8	7	13	14	16	25	30	38	27	FEW	2	2 ^R ^MDL	TCEQ
	9	0	0	0	-1	-1	-1	6	7	5	13	11	16	22	23	22	28	34	FEW	9	2 ^R ^MDL	TCEQ
	28	13	9	7	6	5	3	4	10	15	9	9	14	17	21	23	26	26	FEW	28	1 ^R ^MDL	TCEQ
	64	5	3	2	0	-3	-4	-2	1	4	4	8	14	20	27	31	28	28	SPN	64	1 ^R ^MDL	TCEQ
	640 ¹	11	9	8	6	5	7	6	17	18	22	20	22	26	32	31	36	36	FEW	640 ¹	1 ^R ^MDL	Private
	643 ¹	11	12	10	7	6	4	8	7	12	11	11	16	21	29	36	33	30	FEW	643 ¹	1 ^R ^MDL	Private
	1035	18	14	12	10	8	4	10	6	8	13	10	14	19	30	36	38	34	FEW	1035	1 ^R ^MDL	TCEQ
		Notes: ¹- These sites are maintained and operated by AECOM for South East Texas Regional Planning Commission. 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