Trees have 4 stages from 0 - healthy to 3 - no leaves. Debug info when hovering over a tree refers to that value as 'progress'.
I'm looking how to check that value. I've failed to find any relevant info in Factorio API docs, but maybe I'm just blind.
Trees pollution progress value
Re: Trees pollution progress value
I'm an admin over at https://wiki.factorio.com. Feel free to contact me if there's anything wrong (or right) with it.
Re: Trees pollution progress value
Thanks. So I was blind...