Pollen counting samplers trends from 1963-2016
Saturday, March 3, 2018
South Hall A2 (Convention Center)
Jendayi Jones, Preeti Wagle, Leonard Bielory, MD FAAAAI
RATIONALE: Various types of pollen counters have been used (e.g. Durham, Burkard, and Rotorod samplers including petri dishes for molds) to assess the exposure and concentration of pollen related to the development of allergic disorders. The evolution of pollen counting devices was assessed over the course of 50 years.

METHODS: Data from reports provided by the individual pollen counting sites were used to determine the type of pollen counters. As reported previously (Abstract 383 2017 Annual Meeting), 593 sites in the US and internationally, were recorded as active from 1963 to 2016. The maximum stations during a single year were reported in 1971 (143), and the fewest number of stations was provided in 1988 (19);average stations per year was 66.

RESULTS: Pollen samplers over the course of time changed from 1963 100% Durham (D) (58/58 sites); 1964, 95% D(70/74) with 1 Rotoslide(S) and 3 petri dish. Rotorod(R) use was first reported in in 1967, 2% (n=2/116); In 1974, Rotorods were once again used (1/136) and the subsequent years 1975, D:83% (40/48), R:10% (5/48), S:4% (2/48) ; 1980, D:59% (40/68), S:4% (3/68), R:29% (20/68); 1983, D:38% (22/58), S:3% (2/58), R:55% (32/58); 1984, R:100% (31/31). Burkhard(B) was introduced in 1978(2%, 1/57) with subsequent decrease in Rotorods (1991, B:9% (4/47), R:77% (36/47); 2000, B:61% (43/60), R:34% (24/70); 2010, B:85% (58/68), R:12% (8/68); 2016: B:97% (77/79), R:3% (2/79).

CONCLUSIONS: Pollen samplers have evolved from the Durham (gravimetric) to Rotorod (impaction) to Burkard (volumetric) sampling methods that appear to provide similar phenology frequency, duration, but improved quantitation of aeroallergens.