Fair comment Yokka, I would say there's negligible amounts in rain water but without the data at hand I can't confirm that. As a toxicologist friend once told me, anything and everything is toxic, all depending on the amount or concentration consumed (including simple H2O)!
The focus here is really about fluoridation, being the ADDITION of a chemical such as fluoride to our drinking water, which otherwise would not be present in its current concentrations. That is what I'm opposed to.
