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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 Wednesday, July 2, 2025.
measured in parts per billion
RegionCAMSMorningAfternoonCAMSPOCEntity
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 7:00 8:00
Austin - all times are in CST
3 1716151413131415192632343434342517151211 FEW 3 2 R MDL TCEQ
38 1297654611152227323229292212952 FEW 38 1 R MDL TCEQ
614  1 QAS11991081012172326283335333128262220 FEW 614  1 1 N MDL Other Gov
690  1 QAS LIM8644451219242624242724161486 FEW 690  1 1 N MDL Other Gov
1604  1 9666434716 QAS QAS242425202121171313 FEW 1604  1 1 N MDL Other Gov
1605  2 876644671116182223212016117910 FEW 1605  2 1 N MDL Private
1612  3 13996221010161822222426252425222115 FEW 1612  3 1 N MDL Other Gov
1613  3 1086510311162123262526272723201817 FEW 1613  3 1 N MDL Other Gov
1619  4 QAS PMA PMA PMA PMA PMA PMA PMA PMA PMA PMA30303129241617139 FEW 1619  4 1 N MDL Other Gov
1620  4 QAS13131314 PMA PMA PMA PMA PMA PMA292832302826201212 FEW 1620  4 1 N MDL Other Gov
1629  5 QAS1310974310172226262526303429232320 FEW 1629  5 1 N MDL Other Gov
1630  5 QAS2574 QAS89122023262625282422191819 FEW 1630  5 1 N MDL Other Gov
1675  1 PMA PMA PMA PMA PMA PMA QAS QAS QAS PMA27262729252322201917 FEW 1675  1 1 N MDL Other Gov
Notes:
- These sites are maintained and operated by Dios Dado 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 the Capital Area Council of Governments.
- These sites are maintained and operated by Weston Solutions 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.