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. Author manuscript; available in PMC: 2019 Jul 29.
Published in final edited form as: J Occup Environ Hyg. 2017 Aug;14(8):585–595. doi: 10.1080/15459624.2017.1304645

Figure 1.

Figure 1.

The physical collection efficiency of four filters at sampling flow rates of 2 and 4 L min−1 determined at RH≈20–25%. Each data point represents an arithmetic mean of ten consecutive 1-min measurements. The standard deviations are too small to be seen in the graphs. MCE = Mixed Cellulose Easter, PTFE = Polytetrafluoroethylene, PC = Polycarbonate.