dgriffith , 4 hours ago

This is the hard part. Modern techniques can detect just about anything in anything, down to parts per billion or less.

So we all have measurable quantities of PFAS , radioactive materials, arsenic, plastics, endocrine disrupters and so on and so forth, but there are very few actual hard numbers as to what levels are distinctly harmful and what levels are just “something else will kill you long before this does”.