The first step is to estimate the amount of water
aerosol inhaled during a 10 min shower. Peak
aerosol mass (mean ± SD, particle size range
from 0.1 to >2 lm) produced by a residential
showerhead during a 10 min shower is reportedly
414 ± 258 lg/m3 [3]. Assuming an adult human
ventilation rate of 20 m3
/day would yield a
human water aerosol exposure of 58 lg during
a 10 min shower