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- ArticleFedorak PM, Westlake WS.Can J Microbiol. 1978 May;24(5):618-9.Two types of commercially available microbiological air samplers (model STA-203, New Brunswick Scientific and All-Glass Impingers, Millipore) were used outdoors at an activated sludge treatment plant. The recovery of viable particles with both instruments was increased three- to eight-fold by shielding the trapping medium from the sun during the sampling process.