SmogRank / History / City race
Cities in Slovakia, 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 Slovakia for PM2.5 over the 30 days to 17 Apr 2025: Čaňa 19.9 µg/m³, Revúca 19.1 µg/m³ and Šahy 19.1 µg/m³.
- 1ČaňaKošice Region19.9
- 2RevúcaBanská Bystrica Region19.1
- 3ŠahyNitra Region19.1
- 4LučenecBanská Bystrica Region19.0
- 5MartinŽilina Region17.8
- 6ŽarnovicaBanská Bystrica Region17.5
- 7PrešovPrešov Region17.4
- 8HumennéPrešov Region17.2
- 9OščadnicaŽilina Region17.1
- 10ČadcaŽilina Region17.1
- 11ŽilinaŽilina Region16.6
- 12PúchovTrenčín Region16.3
- 13KrompachyKošice Region16.0
- 14RužomberokŽilina Region15.7
- 15KošiceKošice Region15.3
- 16TrebišovKošice Region15.0
- 17TrenčínTrenčín Region15.0
- 18Vranov nad TopľouPrešov Region14.9
- 19PezinokBratislava Region14.5
- 20BardejovPrešov Region14.0
+ 22 more cities, the next at 13.8 µg/m³
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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.