Houston Health Department
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:
• Dematiaceous conidia
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.
For additional information,
Recorded message is available at 713.247.5846.
Information about air quality is available by calling 832.393.5612.
For additional information, email us or call 832.393.3920. Have a Wonderful Monday!