When did you last live there? I was traveling/living in various parts of Greece for short periods of time over the last 30 years, the last time in 2018, where, due to EU economic sanctions, there were still regular fires happening in the anarchist district (Exarcheia). Googling shows that there are still regularly things burning there (as well as Zografou), though lately[0] it seems to be primarily vehicles. Just Google "Exarcheia fires" and you will find a lot of articles from almost every year going back to at least 2008.

Zakynthos is the island I was referring to. It's an illegal dumping ground, and even the EU has fined them for it. Also Kalymnos has a decades-old issue with burning trash - they even call it "trash volcano". Lots of other islands also have illegal dumping issues. Also many nature areas in mainland Greece are not in the most pristine state, often littered with junk, often junk that you can tell has been there for a long time. Whenever I went exploring by car, we would find the most beautiful areas but almost always trash everywhere :( Maybe it's gotten better though, I haven't been back since 2019, though I'm not sure I really want to.

[0] https://www.thenationalherald.com/arsonists-run-amok-in-athe...