Anything can be a toxin at a high enough dose, likewise a pollutant depends on the concentration. https://en.m.wikipedia.org/wiki/The_dose_makes_the_poison htt

Anything can be a toxin at a high enough dose, likewise a pollutant depends on the concentration. https://en.m.wikipedia.org/wiki/The_dose_makes_the_poison https://en.m.wikipedia.org/wiki/The_dose_makes_the_poison