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Allergy and Asthma Family Care North Texas Blog

Pollen Count Alert – August 20

There are HIGH concentrations of Trees (Elm) and moderate concentrations of Grass and Weeds (Goosefoot, Lamb’s Quarters, Pigweed, Amaranth, Saltbush, Russian Thistle, Ragweed).

There is a low concentration of mold.

Visit the pollen counting station website to learn more.

Pollen Count Alert August 20 Flower Mound Denton Allergist Grass Weeds Trees

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The NAB pollen and mold spore levels were developed using the chart below. The concentrations in the chart (pollen or spores per cubic meter) were statistics from all certified counting sites. The levels correspond to different ranges for each of the pollen categories and for fungal spores. The concentrations were translated into levels based on the following:

  • Low levels are concentrations that are less than the median or 50th percentile (i.e. half the counts were below the median.)
  • Moderate levels are concentrations that fall between the 50th and 75th percentile
  • High levels fall between the 75th and 99th percentile
  • Very high levels are above the 99th percentile (99% of the counts are below this level)

Based on these definitions, we suggest the following ranges for low, moderate, high, and very high.

NAB SCALE
* MOLD
0 – 6499 Low
6500 – 12999 Moderate
13000 – 49999 High
>50000 Very High
GRASS
0 – 4 Low
5 – 19 Moderate
20 – 199 High
>200 Very High
TREE
0 – 14 Low
15 – 89 Moderate
90 – 1499 High
>1500 Very High
WEED
0 – 9 Low
10 – 49 Moderate
50 – 499 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 levels and the corresponding ranges are based entirely on ecological measurements, not on health effects. Because the data were from all certified counting stations, the ranges allow comparisons between sites across the country and may be more appropriate than a range based on local numbers. This does mean that, for some stations, some categories will never be high. Because of this, a few stations have determined the ranges for their own locations and do not use these national ranges.

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