Quote:
Originally Posted by OBW
Yes, but expressed in parts per billion (ppb). Quantities far below what would be required to do damage to the human body.
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Or so you would think. In one famous case many people were poisoned by what appeared to be a quantity far below what would be required to do damage. However, they were assuming that was from drinking the water. The way the toxin poisoned the people was during their showers, it was a volatile chemical that evaporated at a lower temperature and was concentrated and breathed in as vapor during showers.