"Online Posting Date: August 16, 2002] **PEER REVIEWED** ..... RAIN/SNOW/FOG: Barium was detected in rainwater samples obtained from Finland, Norway and Russia at median concentrations of 0.47-1.07 ug/L(1)."
Literature: [(1) Reimann C et al; Atmos Environ 31: 159-70 (1997) (2) ATSDR; Toxicological Profile for Barium and Barium Compounds. Atlanta, GA: Agency for Toxic Substances and Disease Registry, US Public Health Service (2007)] **PEER REVIEWED**
http://toxnet.nlm.nih.gov/cgi-bin/sis/search/a?dbs+hsdb:@term+@DOCNO+6934