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Pollen and Mold Center
Tree Pollen Levels - General Information
The following Aeroallergen Network calculations are based on the data reported by all counting stations for trees, grass, weeds, and molds. The National Allergy Bureau (NAB) Report calculates by:
- Median or 50th percentile (half of counts are below this point)
- 75th percentile (75% of counts are below this point)
- 99th percentile (99% of counts are below this point)
Tree Pollen Levels
| Grains per Cubic Meter |
Level |
| 0-15 |
Low |
| 15-90 |
Moderate |
| 90-1500 |
High |
| 1500 or more |
Very High |
What This Means to Tree Pollen Allergy Sufferers
| Level |
Those Who Will Likely Suffer Symptoms |
| Absent |
No symptoms |
| Low |
Only individuals extremely sensitive to tree pollens |
| Moderate |
Many individuals sensitive to tree pollens |
| High |
Most individuals with any sensitivity to tree pollens |
| Very High |
Almost all individuals with any sensitivity to tree pollens. Extremely sensitive people could have severe symptoms. |
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