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Mercer Arboretum C557

    Temporarily down due to site construction

  • EPA site number: 48-201-0557
  • State: Texas
  • County: Harris
  • City: Houston
  • Address: 22306 Aldine Westfield Road
  • Site coordinates:
    • Latitude: 30° 02' 17.00" North (+30.038056°)
    • Longitude: 95° 22' 52.00" West (-95.381111°)
    • Elevation: 12 m (39 ft)
  • Maintained by: Harris County Pollution Control Services Department
Area Map Overall site
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Street level Map
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Historical Measurements
Monthly Summary Report
Yearly Summary Report
  • Real-time monitoring since: Wednesday, February 18, 2004
  • Current status: Active
  • Parameters that have been monitored but are no longer active:
    • Pollution parameters:
      • Ozone

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.