Period | ||||
---|---|---|---|---|
1996* | 1997 | 1998 | 1999† | |
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 Hill | 2 | 10 | 0 | 1 |
Salem | 1 | 5 | 0 | 1 |
North | 0 | 2 | 0 | 0 |
Proportion of days with very high dust concentrations (100–300 μg/m 3 ) | ||||
Cork Hill | 5 | 20 | 1 | 5 |
Salem | 2 | 5 | 1 | 5 |
North | 1 | 2 | 1 | 5 |
Cork Hill | 10 | 50 | 15 | 50 |
Proportion of days with raised dust concentrations (50–100 μg/m 3 ) | ||||
Salem | 5 | 30 | 15 | 55 |
North | 1 | 10 | 5 | 20 |