breathe http://www.arb.ca.gov/research/resnotes/notes/94-11.htm http://www.arb.ca.gov/research/resnotes/notes/94-11.htm http://www.arb.ca.gov/research/resnotes/notes/94-11.htm 20.000 liters of air every day breathe www.arb.ca.gov/research/resnotes/notes/94-11.htm a 1994 study www.arb.ca.gov/research/resnotes/notes/94-11.htm a study How Much Air Do We Breathe? a study by the California EPA a study by the California EPA a study http://www.arb.ca.gov/research/resnotes/notes/94-11.htm a 1994 study a study by the California EPA http://www.arb.ca.gov/research/resnotes/notes/94-11.htm