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Houston Department of Health and Human Services (HDHHS) > Daily Pollen and Mold Spore Count > What the Numbers Mean

What the Numbers Mean

***The following ranges are based on the data reported by all counting stations for weeds, grasses, trees and mold according to the National Allergy Bureau***

Weed pollen is measured per cubic meter of air.

  • 1-9 pollen per cubic meter of air or less = Low

  • 10 to 49 = Medium

  • 50 to 499 = Heavy

  • Greater than 500 = Extremely Heavy  

Grass pollen is measured per cubic meter of air.

  • 1-4 pollen per cubic meter of air or less = Low

  • 5 to 19 = Medium

  • 20 to 199 = Heavy

  • Greater than 200 = Extremely Heavy

Tree Pollen is measured during the tree pollen season of mid-January through mid-April.  Cedar Elm tree pollen is measured in September and October.  All tree pollen types are reported by HDHHS laboratory.

  • 1 to 14 pollen per cubic meter of air = Low

  • 15 to 89 = Medium

  • 90 to 1499 = Heavy

  • Greater than 1500 = Extremely Heavy

Mold spores are measured per cubic meter of air.

  • 1 to 6499 = Low

  • 6500 to 12999 = Medium

  • 13000 to 49999 = Heavy

  • Over 50000 = Extremely Heavy

The HDHHS Laboratory reports all major types of mold spore irritants:

  • Alternaria

  • Aspergillus 

  • Basidiomycetes

  • Cladosporium

  • Dematiaceous conidia  

  • Epicoccum

  • Drechslera/Helminthosporium

The HDHHS laboratory uses an instrument called the Burkard Spore Trap to measure air samples, in order to provide a daily report and recorded message for the pollen and mold spore count within the Area.  The Burkard Spore Trap collects pollen and mold spores 10 liters/ min, 24 hours a day.  It is located on the roof top of the building. 

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