Figure 4
Effect of bell covers on reducing aerosol number emissions (0.25–35.15 μm size range) from instruments. (A) Participant-specific changes in CO2-normalized aerosol number concentration with bell covers (each line represents a pair of measurements for a participant with and without a bell cover). (B) Average percent reduction in emissions with 95% confidence intervals. Data are background corrected and restricted to instruments with n ≥ 3 measurement pairs.
