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Queensland University of Technology (QUT) researchers have identified a silver lining in the cloud of red dust that enveloped much of eastern Australia two years ago.
Research fellow Dr Rohan Jayaratne from QUT's International Laboratory for Air Quality and Health (ILAQH) said that data, from what is believed to be the first air quality test undertaken during an Australian dust storm, showed that large dust particles swept up the smaller, potentially fatal ultrafine particles caused by everyday vehicle emissions.
Air quality tests taken during the September 2009 dust storm showed that Brisbane's most harmful ultrafine particle pollution from vehicle emissions, which contain 250 well-known carcinogens, almost disappeared as the eerie orange haze settled over the city.
Dr Jayaratne's team, led by ILAQH director Professor Lidia Morawska, said the dramatic shift in air quality was the result of a process of polydisperse coagulation whereby smaller particles, such as diesel emissions, diffuse on to the surface of larger particles, such as dust.
"We have seen this happen in the laboratory but never in an environment like this, given the very specific conditions," he said.
"One of the reasons vehicle emissions are so scary is that the ultrafine particles are able to penetrate deeper into the lungs, in the alveoli, whereas larger particles such as dust tend to get trapped in the upper-respiratory system. Asthma is often caused by larger particles, but the finer particles are associated with long-term health issues such as cardiovascular mortality."
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The threshold for the process of polydisperse coagulation usually occurs when large dust particles reach concentrations of "a couple of hundred" micrograms per cubic metre.
On a typical day in an urban area, such as Brisbane, the dust concentration is about 50 micrograms.
However, at the peak of the dust storm in the Brisbane CBD at noon on September 23, 2009, the measured concentration shot up to 6000 micrograms per cubic metre, causing the vehicle emission particles to almost disappear.
The QUT findings were recently reported in the internationally reputed journal Atmospheric Environment.
Dr Jayaratne said he also investigated causes of severe Australian dust storms in order to predict future occurrences and believes we may see a similarly severe storm this year if dry conditions continue.
"We found dust storms in Australia usually occur after flood events, similar to what Brisbane experienced in January," he said.
"Sediment is carried along inland rivers and settles as fine alluvial dust on the desert floor.
"If these conditions are followed by a prolonged dry season, which we have had, and the heavy winds that are characteristic in September and October, then there is every chance we will see another dust storm similar to the one we experienced in 2009."
Media contact:Alita Pashley, QUT media officer, 07 3138 1841 or firstname.lastname@example.org
Dr Rohan Jayaratne