Allergy Pollen Report from Hedberg Allergy & Asthma Center

This allergy report from Hedberg Allergy & Asthma Center contains the pollen and spore concentration report from the Roger’s sampler for the week of September 21 to September 25, 2021.

Daily Averages

The following table contains the contains the daily concentration of particles in the air from midnight to midnight each day. Numbers are in particles per cubic meter and the corresponding NAB category, see below.

	September 21	September 24	September 25
Molds	High = 37,326	High = 18,806	Moderate = 11,784
Grasses	Moderate = 10	Moderate = 6	Low = 2
Trees	Absent = 0	Absent = 0	Absent = 0
Other Weeds	High = 73	Moderate = 41	Moderate = 18
Ragweed	High = 351	High = 182	High = 102

Weekly Averages

The weekly averages for each category of allergen were as follows:

	Weekly Average
Molds	High = 22,639
Grasses	Moderate = 6
Trees	Absent = 0
Other Weeds	Moderate = 44
Ragweed	High = 211

Allergen Types

The allergen types that were in highest concentration were:

• Molds – Molds were at moderate to very high concentration. Cladosporium, Ascomycetes and Basidiomycetes were abundant each day. Pithomyces, Drechslera were present each day. Alternaria, Penicillium/Aspergillus, Myxomycetes, Smuts, Curvularia, Nigrospora, and hyphal fragments were all noted as well. September 5 started out wet and was dominated by Ascomycetes and Basidiomycetes.
• Grasses – Grass pollen was at moderate to low concentration. Trees – Tree pollen was absent.
• Other Weeds – Other weeds were high to moderate. Amaranthaceae (Amaranths, Chenopodium) were moderate to low. Plantago (plantain), various unidentified Asteraceae (sunflowers, daisies), Xanthium (cockleburs), and Artemisia (mugworts, wormwood) were in low numbers on each day.
• Ragweed – Ambrosia (ragweed) was high through the week.

Notes

The National Allergy Bureau (NAB) sets categories for airborne allergen concentration according to the following table. All concentration ranges in particles per cubic meter.

NAB Standard	Mold	Grass	Trees	Other Weeds	Ragweed
Absent	0	0	0	0	0
Low	1-6,499	1-4	1-14	1-9	1-9
Moderate	6,500-12,999	5-19	15-89	10-49	10-49
High	13,000-49,999	20-199	90-1,499	50-499	50-499
Very High	>50,000	>200	>1,500	>500	>500

Reference: 

Haley Burden
Hedberg Allergy & Asthma Center
479.787.0440