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Two-thirds of all physician office visits are for ear, nose, throat or allergic problems!

Today’s Pollen Count

Pollen Archive

May 2021

Date Ash Cotton
Wood
Elm Fungus Grass Maple Oak
May 100010,23206231
May 200016,279000
May 30000000
May 4046816,27916770
May 581861616,8214613931
May 6093015,348167716
May 70622314,573164631
May 80310017,13177310
May 90263016,43462160
May 10062015,3483100
May 11016013,875000
May 12031013,875800
May 130000000
May 14093015,426316246
May 150108016,2793100
May 160000000
May 1700014,496000
May 18093017,44123160
May 190000000
May 20062017,28646770
May 210463118,604231631
May 2200016,58916310
May 230000000
May 24023018,6041600
May 25077019,6894600
May 26062017,364000
May 2701081616,744623116
May 280170018,992463116
May 290000000
May 300000000
May 310000000

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NAB: Reading the Charts

aaaai allergy pollen countsThe following 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, we suggest the following definitions for low, moderate, high and very high concentration levels:

NAB SCALE

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

 

* These mold levels were determined based on outdoor exposure to natural occurring spores in the environment and should not be applied to indoor exposure which may represent an entirely different spectrum of spore types.

These definitions would allow comparison between sites across the country. They are based on ecological measurements, not health effects. However, assuming dose/response relationships are the same across the country, the definitions are probably more appropriate than a definition based on local numbers. This does mean that, for some stations, some categories will never be high.