Abstract
ABSTRACT THE sizes of aerial starch, grain meal and all particles present in swine finishing houses were described by the log normal distribution. Respirable fractions by mass and by number were 3.7 and 76.1%, respectively, as estimated from the particle size distribution. Most starch and grain meal particles identified were larger than 5 jum diameter. Fifty percent of all particles were less than 2.6 jLtm diameter. Higher total mass concentrations were not associated with similar increases in respirable mass concentrations. The aerial dust originated primarily from feed, based on particle identification using optical and electron scanning microscopy.
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