[GRASS POLLEN DISPERSAL, SYMPTOM AND MEDICATION SCORE IN PATIENTS WITH GRASS POLLINOSIS (FIRST REPORT) -INVESTIGATION OF GRASS POLLEN DISPERSAL PERIOD AND REGIONAL CHARACTERISTICS].

OBJECTIVE

We conducted an airborne pollen survey to determine the grass pollen dispersal period unaffected by other pollen dispersal and examine its regional characteristics.

METHODS

The Airborne pollen count was investigated from May 1 to August 31, 2024, using the gravitational method, IS-type rotary pollen trap, at 13 cooperative pollen monitoring sites. The investigated pollens were Cupressaceae (except for Cryptomeria japonica), Alnus, Betula, Poaceae, Ambrosia, Artemisia, and Humulus japonicus. We set conditions for the start date, end date, peak start date, and peak end date of pollen dispersal and indicated the pollen dispersal period and peak dispersal period for each observation site.

RESULTS

Grass pollen was collected from early June to mid-July at the pollen monitoring sites in Hokkaido, and at the other sites, from early May to mid-to-late August. Tree pollen is mainly collected from early May to early June. Grass-weed pollen other than grass pollen was mainly collected in mid-to-late August.

CONCLUSION

Based on this survey, the grass pollen dispersal period of low impact from other pollen dispersal was determined to be from June to July in Hokkaido and from May to August in other regions.