Table 6

Estimated proportion (%) of days with differing levels of dustiness based on measurement data (tables 3–5), reported levels of volcanic activity (MVO), and information from interviews with islanders

Period
1996*199719981999†
Note that Cork Hill has been unoccupied since mid 1997 and Salem was officially unoccupied between August 1997 and October 1998.
*April to December.
†January to August—rainfall data used to estimate proportion of days between January and April.
Proportion of days with alert level dust concentrations (>300 μg/m 3 )
Cork Hill21001
Salem1501
North0200
Proportion of days with very high dust concentrations (100–300 μg/m 3 )
Cork Hill52015
Salem2515
North1215
Cork Hill10501550
Proportion of days with raised dust concentrations (50–100 μg/m 3 )
Salem5301555
North110520