Microbial aerosols: estimated contribution of combine harvesting to an airshed.
From plate counts of the airborne microorganisms in the downwind dust plume of operating grass-seed combines, the mean source concentrations were calculated to be 6.4 x 10 and 4.7 x 10/m, respectively, potentially accounting for at least 41.9% of the bacteria and 35.1% of the fungi in the airshed in the Willamette Valley, Oregon.
Lighthart
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Toxic and Hazardous Materials Branch, Corvallis Environmental Research Laboratory, U.S. Environmental Protection Agency, Corvallis, Oregon 97333.