Googling for "epa pfoa", I found this page, where the limit is listed as 70 parts per trillion: https://www.epa.gov/ground-water-and-drinking-water/drinking-wa

Googling for "epa pfoa", I found this page, where the limit is listed as 70 parts per trillion: https://www.epa.gov/ground-water-and-drinking-water/drinking-water-health-advisories-pfoa-and-pfos https://www.epa.gov/ground-water-and-drinking-water/drinking... Did you get a chance to take a crack at the chemistry math problem I posed? Once you've solved that one, here is another one for you: If 4.75 nanograms of the material is aerosoled out into the air, what amount is absorbed directly into the food which is cooking on the pan?