98:
A comparison of Plantago major pollen counts at two different heights
Saturday, March 3, 2018
South Hall A2 (Convention Center)
Preeti Wagle, Jendayi Jones, Leonard Bielory, MD FAAAAI
RATIONALE: The current recommendation for height of pollen collection is 30-60' off the ground, in an area clear of trees and other structures, so as not to impede air flow. The average person has exposure within 6' of the ground surface. The objective was to determine the effect of height on the concentration of pollen and human exposure.

METHODS: Pollen counts was generated at a suburban location (40.700, -74.322; Springfield, NJ) from July 8 - August 28, 2017 (41 days), and pollen counts were performed almost daily, using a Rotorod™ sampler placed at two different heights (68.5” = A and 210.5” = B), and assessed for Plantago major (Pm) species (“English Plantain”). No Pm pollen noted before the start date.

RESULTS: Average Pm pollen counts over 41 days for Height A and Height B were respectively 26.2 and 66.78 g/m3; cumulative Pm count were 1048 and 2471 g/m3. Release of Pm wasn't continuous, with 5 peaks of release seen at both heights, with 3 that were statistically different on days 7, 28, and 40 (p= 0.548, 0.469 and 0.344). There was a minor release at A without it being noted in B (9 g/m3)

CONCLUSIONS: Average and cumulative counts were greater for height B, but release of pollen occurred 2 days earlier at height A. Statistically significant peaks occurred throughout plantain season at 3 points. This shows that the start date for pollen can be noted earlier at levels for an average person exposed than what is detected at the currently recommended counting height.