The 1985 American Conference of Governmental Industrial Hygienists (ACGIH) report containing proposals for dust sampler performance requirements was critiqued. The relation between proposed sampling efficiency envelopes or bands and permissible concentration measurement accuracy was investigated. The overall accuracy (both bias and imprecision) limited by the criteria was estimated for sampling of coal mine dust characterized in previous studies. Accuracy in sampling log normal dust distributions with several extreme allowable samplers was determined. When the dust mass median diameter was 18.6microm and the geometric standard deviation was 2.3, the net error ranged from -64.5 percent to 113.1 percent. Evaluation of these results with regards to curves depicting bias and imprecision permissible by ACGIH criteria, indicated that some acceptable samplers would give readings about six times as large as other samplers. The authors conclude that the proposed ACGIH criteria not only limit the class of permissible samplers, but also allow too much variation in estimates from single dust clouds. A reworking of the sampler criteria is recommended.
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