Figure 4
From: A novel application of capnography during controlled human exposure to air pollution
Unexpected zero shift for one test out of eight. Screenshot of WinDaq window showing trend capnography tracing for the EXP#1 (left side) and EXP#2 (right side) for the subject who had the particle delivery/CO2 removal mask incorrectly positioned during the EXP#2 that caused CO2 re-breathing.