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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 Friday, April 19, 2024.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00
Houston-Galveston-Brazoria - all times are in CST
1 2517232115 FEW 1 2 R MDL TCEQ
8 161512103 FEW 8 2 R MDL TCEQ
15 1112151610 FEW 15 3 R MDL TCEQ
26 1714964 FEW 26 2 R MDL TCEQ
35 2221232420 FEW 35 1 R MDL TCEQ
45 2122212219 FEW 45 1 R MDL TCEQ
53 2525242217 FEW 53 1 R MDL TCEQ
78 1210111312 FEW 78 1 R MDL TCEQ
84 201819189 FEW 84 1 R MDL TCEQ
403  1 2220151210 FEW 403  1 3 R MDL Other Gov
405  1 1312010 FEW 405  1 1 R MDL Other Gov
406  1 1820201914 FEW 406  1 1 R MDL Other Gov
408  1 231718219 FEW 408  1 2 R MDL Oth Gov
409  1 2020211612 FEW 409  1 2 R MDL Other Gov
410  2 2625231916 FEW 410  2 1 R MDL Other Gov
416  1 2525232322 FEW 416  1 1 R MDL Other Gov
417  1 2117232220 FEW 417  1 1 R MDL Other Gov
551  3 7842 NA NA 551  3 1 N MDL Oth Gov
552  3 17191616 NA NA 552  3 1 N MDL Oth Gov
553  3 111084 NA NA 553  3 1 N MDL Oth Gov
554  3 171285 NA NA 554  3 1 N MDL Oth Gov
556  4 18191719 NA NA 556  4 1 N MDL Other Gov
557  3 6120 NA NA 557  3 1 N MDL Oth Gov
558  3 19201815 NA NA 558  3 1 N MDL Oth Gov
559  3 191399 NA NA 559  3 1 N MDL Oth Gov
560  3 121075 NA NA 560  3 1 N MDL Oth Gov
561  3 10442 NA NA 561  3 1 N MDL Oth Gov
562  3 1919167 NA NA 562  3 1 N MDL Oth Gov
563  3 7431 NA NA 563  3 1 N MDL Oth Gov
695  5 2521 NOD2216 FEW 695  5 1 N MDL Other Gov
698  5 1010973 FEW 698  5 1 N MDL Oth Gov
1015 2217232523 FEW 1015 1 R MDL TCEQ
1016 2927242219 FEW 1016 1 R MDL TCEQ
1017 1918232317 FEW 1017 1 R MDL TCEQ
1034 3029302927 FEW 1034 1 R MDL TCEQ
1626  5 11 NOD1175 FEW 1626  5 1 N MDL Other Gov
Notes:
- These sites are maintained and operated by the City of Houston.
- These sites are maintained and operated by the City of Houston Health Department.
- These sites are maintained and operated by the Harris County Pollution Control Services Department.
- These sites are maintained and operated by the Harris County.
- These sites are maintained and operated by University of Houston.

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.