Avobenzone
Butyl Methoxydibenzoylmethane
The main UVA filter in US sunscreens. Needs stabilising or it degrades in sunlight.
How solid is the pore-clogging number
Avobenzone rates 1 of 5 — unlikely to clog pores for most people. The rating is graded moderate. Reasonably supported, but from fewer or less direct sources than the best-established ratings.
It describes the raw ingredient in isolation. In a finished product, how much is present and where it sits in the list matter just as much. Check a whole label to see it in context.