(closed symbols, ‘‘extreme’’ events with reduced values of D),
fluctuations become much larger. It can now be clearly
discerned that during the sampling period 0900–1000 EDT,
just before the pollen concentration reaches a minimum, the
‘‘extreme’’ event duration fraction peaks (D = 0.13 at 0930 EDT)
and then decreases to aminimum (D = 0.06 at 1000 EDT) during
the same sampling period that pollen concentrations are
minimal. Subsequently, the duration fraction rises sharply
again to a value of D = 0.13 at 1015 EDT.