Characteristics of rural dust events shown to impact on asthma severity in Brisbane, Australia.

Wind erosion in arid inland Australia leads to dust plumes which can pass over populated coastal areas in Eastern Australia, such as Brisbane. Such events can lead to concerns about respiratory health problems because they significantly increase the fine particle component of atmospheric aerosols. This paper examines the particulate characteristics of 11 dust events in Brisbane and associations with daily diary records (peak expiratory flow, symptoms) of people with asthma, and hospital emergency attendances for asthma during a number of seasons between 1992 and 1994. These dust events are frequently, but not always, characterised by higher particulate levels and higher ratios of fine to coarse particulates. The results indicate that a number of dust events were significantly associated with changes in asthma severity, but general relationships could not be determined. Given that the phenomenon of wind-blown dust is not isolated to the Australian continent, these findings raise important questions about the effects of wind-blown dust in other parts of the world.