Comment by culi

Synthesized from hydroxyphenyl-triazines (HPTs). HPTs were invented to protect materials like automotive paints, aerospace coatings, and heavy-duty plastics from solar degradation.

It doesn't seem to bioaccumulate in marine organisms despite the fact that it doesn't biodegrade. This seems to be due to the sheer size of the compound making it not easily cross the biological membranes. It does however accumulate on lake and ocean bed sediments so there are still some long term concerns.

Overall it's environmental profile seems like a huge step up from previous classes of sunscreen chemicals but it's not perfect either.