Best beaches in Athens for 2018 (or nearby) post oil spill?


I was wondering if anyone has been to the beaches in Athens since the oil spill in Oct 2017. Are they open? If so, are they clean? Not interested in tours etc, prefer to relax, swim and eat all day. Planning to go in early June 2018. We wont have a car, so easily accessible by subway/cab or even a day trip by boat if it's worth doing. Access to umbrellas and lounge chairs needed for old/young.