Thanks for the link. If memory serves (been 14 years since I worked for the plastics and chemicals industries), levels set by EPA are often (if not usually) 3 orders of magnitude greater than what tox testing shows as lethal dose - that's how much of a margin there is. So if 1 ppm is acutely toxic, the regulators will set 1 ppb as the standard. Forgive me if I've misremembered any of this, it was a big part of my workadays for about 12 years.
-- Mark
http://www.tpfr.org
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