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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

September 2017

Date Elm Fungus Grass Oak Pigweed Ragweed
Sep 1000000
Sep 2000000
Sep 304,80600031
Sep 404,72800031
Sep 505,271003146
Sep 604,86100031
Sep 7775,8913100372
Sep 805,5810016217
Sep 9314,8831600248
Sep 10936,511008193
Sep 11466,124000232
Sep 12000000
Sep 13314,9610016186
Sep 1405,9680023248
Sep 15418046016201
Sep 161085,968000263
Sep 171705,4261600294
Sep 18624,186000224
Sep 19424,186000232
Sep 20423,798000658
Sep 21934,961000372
Sep 22234,3410016372
Sep 2303,41031160217
Sep 2403,178000263
Sep 25163,953000248

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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.