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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 Sunday, July 13, 2025.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00
Houston-Galveston-Brazoria - all times are in CST
1 131212 FEW 1 2 R MDL TCEQ
8 121212 FEW 8 2 R MDL TCEQ
15 141411 FEW 15 3 R MDL TCEQ
26 161514 FEW 26 2 R MDL TCEQ
35 151514 FEW 35 1 R MDL TCEQ
45 141412 FEW 45 1 R MDL TCEQ
53 171614 FEW 53 1 R MDL TCEQ
78 545 FEW 78 1 R MDL TCEQ
84 1198 FEW 84 1 R MDL TCEQ
403  1 101011 FEW 403  1 3 R MDL Other Gov
405  1 965 FEW 405  1 1 R MDL Other Gov
406  1 12119 FEW 406  1 1 R MDL Other Gov
408  1 141413 FEW 408  1 2 R MDL Other Gov
409  1 141311 FEW 409  1 2 R MDL Other Gov
410  2 171513 FEW 410  2 1 R MDL Other Gov
416  1 141311 FEW 416  1 1 R MDL Other Gov
417  1 161716 FEW 417  1 1 R MDL Other Gov
551  3 1210 NA NA 551  3 1 N MDL Oth Gov
552  3 1414 NA NA 552  3 1 N MDL Oth Gov
553  3 1210 NA NA 553  3 1 N MDL Oth Gov
554  3 1110 NA NA 554  3 1 N MDL Oth Gov
557  3 1213 NA NA 557  3 1 N MDL Oth Gov
558  3 1313 NA NA 558  3 1 N MDL Oth Gov
559  3 1312 NA NA 559  3 1 N MDL Oth Gov
560  3 99 NA NA 560  3 1 N MDL Oth Gov
561  3 1313 NA NA 561  3 1 N MDL Oth Gov
562  3 1110 NA NA 562  3 1 N MDL Oth Gov
563  3 PMA PMA NA NA 563  3 1 N MDL Oth Gov
1015 121315 FEW 1015 1 R MDL TCEQ
1016 161617 FEW 1016 1 R MDL TCEQ
1017 151617 FEW 1017 1 R MDL TCEQ
1034 202019 FEW 1034 1 R MDL TCEQ
Notes:
1 - These sites are maintained and operated by the City of Houston.
2 - These sites are maintained and operated by the City of Houston Health Department.
3 - These sites are maintained and operated by the Harris County Pollution Control Services Department.

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.