We evaluated respiratory functions in 39 volunteers with Japanese cedar (JC) pollinosis exposed to 8,000 grains/m3 of JC pollen in the OHIO Chamber, which stably disperses fixed pollen concentrations, in non-pollen season. PEF, FEV1, FEV1%, and FVC were measured before and after pollen exposure using the “HI-101” spirometer (Chest Co. Ltd. Tokyo). No significant differences were seen in these four parameters, suggesting that JC pollen exposure under these conditions does not affect lower respiratory functions and is safe and tolerable.
