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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.

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Ozone Hourly Averages for Thursday, March 23, 2023.
measured in parts per billion
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00 5:00 6:00
Austin - all times are in CST
3 252524232323202122232526293129262625 FEW 3 2 R MDL TCEQ
38 212122222021222121232527303332292828 FEW 38 1 R MDL TCEQ
614  1 211919181818181717171921232525252425 FEW 614  1 1 N MDL TCEQ
690  1 232222222221212019212426293132292726 FEW 690  1 1 N MDL TCEQ
1604  1 242322212123232223232525262626262526 FEW 1604  1 1 N MDL TCEQ
1605  2 232221191818181819212324262725232321 FEW 1605  2 1 N MDL Private
1612  1 242323222323222122252626252424222224 FEW 1612  1 1 N MDL TCEQ
1613  1 232423222122222021242525242424222221 FEW 1613  1 1 N MDL TCEQ
1619  3 292928262524252324272930323433303028 FEW 1619  3 1 N MDL Other Gov
1620  3 262726252321212123252728293232292825 FEW 1620  3 1 N MDL Other Gov
1675  4 242222222223222122232526272929282928 FEW 1675  4 1 N MDL Other Gov
- These sites are maintained and operated by Weston Solutions, Inc. for the Capital Area Council of Governments.
- These sites are maintained and operated by St. Edwards University/CAPCOG.
- These sites are maintained and operated by Weston Solutions for CAPCOG.
- These sites are maintained and operated by Dios Dado for the Capital Area Council of Governments.

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.