To find that out, he says, future longer, larger - scale experiments, perhaps using natural dust, are required. (sciencemag.org)
However, studies of sediment cores have shown that natural dust deposition has been in decline. (nextbigfuture.com)
The paradoxical finding — that more natural dust in the air improves air quality — comes from a team of researchers from the Department of Energy's Pacific Northwest National Laboratory and Scripps Institution of Oceanography at the University of California at San Diego. (sciencedaily.com)