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 Houston Health Department 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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