Pollen Count

March 13, 2010

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Pollen Count

Trees Grasses Weeds
Ragweed Molds
The previous Aeroallergen Network calculations are based on the data (per cubic meter) reported by all certified counting stations for trees, grasses, weeds and molds.
  • 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)

Based on these calculations, the National Allergy Bureau has set the following definitions for low, moderate, high and very high concentration levels:

National Allergy Bureau Scale
* MOLD
0 Absent
1 - 6499 Low
6500 - 12999 Moderate
13000 - 49999 High
>50000 Very High
GRASS
0 Absent
1 - 4 Low
5 - 19 Moderate
20 - 199 High
>200 Very High
TREE
0 Absent
1 - 14 Low
15 - 89 Moderate
90 - 1499 High
>1500 Very High
WEED
0 Absent
1 - 9 Low
10 - 49 Moderate
50 - 499 High
>500 Very High

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