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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.

Use the controls below to select a different date or parameter. Click on the Generate Report button once you have made your selections.

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, March 23, 2023.
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
Houston-Galveston-Brazoria - all times are in CST
1 2827262522222121242831323232302723 FEW 1 2 R MDL TCEQ
8 2525252322201920222731323232312924 FEW 8 2 R MDL TCEQ
15 91176453292931323231302615 FEW 15 3 R MDL TCEQ
26 3130302927262424283339403939373532 FEW 26 2 R MDL TCEQ
35 2929282727262525273031313130282624 FEW 35 1 R MDL TCEQ
45 1819191817161411222628272625242321 FEW 45 1 R MDL TCEQ
53 3130292828272528313436363433323128 FEW 53 1 R MDL TCEQ
78 2019222118181717213140434545434038 FEW 78 1 R MDL TCEQ
84 3028272626232325273031323231302624 FEW 84 1 R MDL TCEQ
403  1 2628252324201916212530293030292623 FEW 403  1 3 R MDL Other Gov
405  1 25242320171513151724 PMA PMA PMA29292621 FEW 405  1 1 R MDL Other Gov
406  1 282826262419202023 QAS QAS292830262421 FEW 406  1 1 R MDL Other Gov
408  1 2928272523191820253133343331302825 FEW 408  1 2 R MDL Oth Gov
409  1 2928262526242325293233343130292825 FEW 409  1 2 R MDL Other Gov
410  2 2120201817161212192425252424232120 NA 410  2 1 R MDL Other Gov
416  1 292927272625222124303232 QAS QAS QAS QAS24 FEW 416  1 1 R MDL Other Gov
417  1 3030292827262323253234353435333226 FEW 417  1 1 R MDL Other Gov
551  3 1010 FEW1355242328302929292620 NA NA 551  3 1 N MDL Oth Gov
552  3 21222120201813161823232526272626 NA NA 552  3 1 N MDL Oth Gov
553  3 20202017171617182529313232302724 NA NA 553  3 1 N MDL Oth Gov
554  3 25242322211920242932323231302826 NA NA 554  3 1 N MDL Oth Gov
556  4 19232312121297922242425271323 NA NA 556  4 1 N MDL Other Gov
557  3 26232323212017222733353736373530 NA NA 557  3 1 N MDL Oth Gov
558  3 26252425242324252930303030292623 NA NA 558  3 1 N MDL Oth Gov
559  3 26252422181517212630313129292726 NA NA 559  3 1 N MDL Oth Gov
560  3 111316191586112327293030302823 NA NA 560  3 1 N MDL Oth Gov
561  3 25232221201918232832353532313028 NA NA 561  3 1 N MDL Oth Gov
563  3 26252321212121212631353536353229 NA NA 563  3 1 N MDL Oth Gov
695  5 2727 NOD2524242323243132333233322924 NA 695  5 1 N MDL Other Gov
698  5 302928 QAS21232020233138414342393634 NA 698  5 1 N MDL Oth Gov
1015 766458338193131313027199 FEW 1015 1 R MDL TCEQ
1016 3434333434333335343435343331302930 FEW 1016 1 R MDL TCEQ
1017 3333333130292825283537363738363634 FEW 1017 1 R MDL TCEQ
1034 3229303030303132313131303136402826 FEW 1034 1 R MDL TCEQ
1626  5 2930302827262224263031313130302725 NA 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.