SHOWER EXPOSURE to volatile organic compounds. “The chloroform dose to an individual from showering was determined based on exhaled breath analysis. The postexposure chloroform breath concentration ranged from 6.0-21 μg/m-3 while all corresponding background breath concentrations were less than 0.86 μg/m-3.”
http://onlinelibrary.wiley.com/doi/10.1111/j.1539-6924.1990.tb00542.x/abstract