indicates that relative to the neighboring pollen sampling periods,
‘‘extreme’’ ejections (high thresholds) occur increasingly less
as the threshold value is raised during periods of minimum
pollen concentration. Thus, ‘‘extreme’’ events may be instrumental
as an upward pollen transport mechanism as
indicated by DNS (Soldati, 2005). However, since the here
presented synchronicity between turbulence and pollen
concentration is based on measurements made during only
2 days, one should be careful with its interpretation.