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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, April 24, 2025.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00
San Antonio - all times are in CST
23 30 NA 23 2 R MDL TCEQ
58 30 NA 58 1 R MDL TCEQ
59 28 NA 59 1 R MDL TCEQ
501  1 30 NA 501  1 1 N MDL Oth Gov
502  1 28 NA 502  1 1 N MDL Oth Gov
503  1 23 NA 503  1 1 N MDL TCEQ
504  1 21 NA 504  1 1 N MDL TCEQ
505  2 28 NA 505  2 1 N MDL Other Gov
506  1 25 NA 506  1 1 N MDL TCEQ
622  3 33 NA 622  3 1 N MDL TCEQ
678  3 19 NA 678  3 1 N TCEQ
1610  3 30 NA 1610  3 1 N MDL TCEQ
Notes:
1 - These sites are maintained and operated by Weston Solutions Inc. for Alamo Area Council of Governments.
2 - These sites are maintained and operated by Weston Solutions for AACoG.
3 - These sites are maintained and operated by Weston Solutions Inc. for City Public Service.

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.