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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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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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Ozone Hourly Averages for Thursday, September 28, 2023.
measured in parts per billion
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00
Austin - all times are in CST
3 312625252622172329 FEW 3 2 R MDL TCEQ
38 1211830-4 NEG NEG PMA FEW 38 1 R MDL TCEQ
614  1 343226221813162232 FEW 614  1 1 N MDL TCEQ
690  1 212020161513131121 FEW 690  1 1 N MDL TCEQ
1604  1 20191513630822 FEW 1604  1 1 N MDL TCEQ
1605  2 292319142117132027 FEW 1605  2 1 N MDL Private
1612  1 36262119552930 FEW 1612  1 1 N MDL TCEQ
1613  1 313026221464927 FEW 1613  1 1 N MDL TCEQ
1619  3 24181613751112 FEW 1619  3 1 N MDL Other Gov
1620  3 1710541040525 FEW 1620  3 1 N MDL Other Gov
1629  4 33313026211571027 FEW 1629  4 1 N MDL Other Gov
1630  4 19221112321921 FEW 1630  4 1 N MDL Other Gov
1675  5 2218139400315 FEW 1675  5 1 N MDL Oth 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 Weston Solutions, Inc. for CAPCOG.
- These sites are maintained and operated by Weston Solutions, Inc. for CAPCOG .

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.