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 May 2025: Čaňa 14.5 µg/m³, Humenné 10.9 µg/m³ and Prešov 10.3 µg/m³.
- 1ČaňaKošice Region14.5
- 2HumennéPrešov Region10.9
- 3PrešovPrešov Region10.3
- 4LučenecBanská Bystrica Region9.4
- 5RevúcaBanská Bystrica Region9.3
- 6OščadnicaŽilina Region9.3
- 7MartinŽilina Region9.3
- 8ČadcaŽilina Region9.3
- 9ŽarnovicaBanská Bystrica Region9.2
- 10KrompachyKošice Region9.1
- 11PopradPrešov Region9.0
- 12KošiceKošice Region9.0
- 13ŽilinaŽilina Region8.7
- 14PúchovTrenčín Region8.7
- 15BardejovPrešov Region8.6
- 16BratislavaBratislava Region8.5
- 17SninaPrešov Region8.4
- 18ŠahyNitra Region8.3
- 19ZvolenBanská Bystrica Region8.2
- 20TrnavaTrnava Region8.1
+ 17 more cities, the next at 8.1 µg/m³
Not counted on this day, too few days measured: Pezinok since 17 May 2025, Malacky since 17 May 2025, Chorvátsky Grob - Čierna Voda since 17 May 2025 and 2 more cities.
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.