Tropical makes a logical argument, but it is not backed up by the world of science.
consider:
http://www.cac.yorku.ca/people/mozurke/Halogen.htm
http://www.lbl.gov/Science-Articles/...icroscope.html
http://www.cac.yorku.ca/people/mozurke/Aerosol.htm
It does seem rather counter-intuitive that particles of salt could be suspended in the air like that.