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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, September 27, 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
Houston-Galveston-Brazoria - all times are in CST
1 196111113203951 FEW NA 1 2 R MDL TCEQ
8 4211111418395260 NA 8 2 R MDL TCEQ
15 11422001618365261 NA 15 3 R MDL TCEQ
26 22111118284452 FEW NA 26 2 R MDL TCEQ
35 272216139227214154 FEW NA 35 1 R MDL TCEQ
45 107448416273646 FEW NA 45 1 R MDL TCEQ
53 2214181141216344859 FEW NA 53 1 R MDL TCEQ
78 1211944129 PMA PMA PMA FEW NA 78 1 R MDL TCEQ
84 12310200112284052 FEW NA 84 1 R MDL TCEQ
403  1 2012700002133350 FEW NA 403  1 3 R MDL Other Gov
405  1 3000000319294352 NA 405  1 1 R MDL Other Gov
406  1 118115111720334453 NA 406  1 1 R MDL Other Gov
408  1 2121124001317395661 NA 408  1 2 R MDL Oth Gov
409  1 1612114211624 PMA4857 NA 409  1 2 R MDL Other Gov
410  2 222019129321929375256 NA 410  2 1 R MDL Other Gov
416  1 202119103213 QAS QAS QAS66 NA 416  1 1 R MDL Other Gov
417  1 3331291200032343 PMA FEW NA 417  1 1 R MDL Other Gov
551  3 0000002123244 NA NA NA 551  3 1 N MDL Oth Gov
552  3 14876102173142 NA NA NA 552  3 1 N MDL Oth Gov
553  3 2000001153851 NA NA NA 553  3 1 N MDL Oth Gov
554  3 1000002244053 NA NA NA 554  3 1 N MDL Oth Gov
556  4 221589012153044 NA NA NA 556  4 1 N MDL Other Gov
557  3 10751032330 PMA NA NA NA 557  3 1 N MDL Oth Gov
558  3 81140006233949 NA NA NA 558  3 1 N MDL Oth Gov
559  3 7322216253950 NA NA NA 559  3 1 N MDL Oth Gov
561  3 3300003203451 NA NA NA 561  3 1 N MDL Oth Gov
562  3 PMA PMA PMA PMA PMA PMA PMA PMA PMA PMA NA NA NA 562  3 1 N MDL Oth Gov
563  3 1510101143346 NA NA NA 563  3 1 N MDL Oth Gov
695  5 3532 NOD245753204255 FEW NA 695  5 1 N MDL Other Gov
698  5 342837 NOD5514274654 FEW NA 698  5 1 N MDL Oth Gov
1015 1719000001173148 FEW NA 1015 1 R MDL TCEQ
1016 11113218334246 FEW NA 1016 1 R MDL TCEQ
1017 779115119264253 FEW NA 1017 1 R MDL TCEQ
1034 414142353732284046446370 NA 1034 1 R MDL TCEQ
1606  5 QAS40361824283031374955 FEW NA 1606  5 1 N MDL TCEQ
1611  5 302726 QAS2012204357 FEW NA 1611  5 1 N MDL Other Gov
1626  5 051 NOD-2-3-24163646 FEW 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.