SmogRank / History / City race
Cities in Greece, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in Greece for PM2.5 over the 30 days to 10 Dec 2025: Thessaloníki 19.6 µg/m³, Grevená 9.0 µg/m³ and Pylaía 7.9 µg/m³.
- 1ThessaloníkiCentral Macedonia19.6
- 2GrevenáWest Macedonia9.0
- 3PylaíaCentral Macedonia7.9
- 4KhalándrionAttica7.7
- 5ThrakomakedónesAttica7.2
- 6KozániWest Macedonia6.9
Not counted on this day, too few days measured: Asprópyrgos since 7 Dec 2025, Volos since 30 Nov 2025 and Kastoria since 2 Nov 2025.
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.