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A schematic diagram of the VACES used to deliver CAPs and filtered air to human subjects. Abbreviations: CO, carbon monoxide; CPC, condensation particle counter; NOx, nitrogen oxides; Q, quartz filter; RH, relative humidity; SMPS, scanning mobility particle sizer; SO2, sulfur dioxide; T, temperature; T1 and T2, teflon filters. See “Materials and Methods” for details.
