THE total mass concentration of aerial dust particles in 11 swine finishing units averaged 8.1 mg/m^ during a 9-month survey and exceeded the 15 mg/m^ OSHA threshold in 13 of 88 farm visits. The average particle number concentration from 75 samples of 1.76 to 7.01 jjim diameter particles was 11.2/mL. Total particle mass and number concentrations were significantly related (P<.10) to ventilation type, outside air temperature, inside/outside air temperature difference, and inside relativehumidity. Inorganic contents of aerial and settled dust were 13.2 and 14.2%, respectively. Measures to remove aerial dust should emphasize proper management of ventilation equipment to assure reliable and sufficient airflow.
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Heber et al. (1988) studied this question.
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