Advice from a Californian: HEPA filters are expensive and sell out during fires. Get yourself a box fan and a furnace filter or two of the same size and tape them to the inlet of the fan. It is almost as effective at a fraction of the price. By box fan I mean one of these: https://m.media-amazon.com/images/I/81Omz5tqhIL._AC_UF894,1000_QL80_.jpg

One more reason to get out of Athens as fast as possible. If you are visiting Greece, dont spend too much time in Athens. Do the tourist things, like Parthenon, Plaka, etc and get out.

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