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 14 May 2025: Čaňa 15.2 µg/m³, Humenné 11.4 µg/m³ and Prešov 11.1 µg/m³.
- 1ČaňaKošice Region15.2
- 2HumennéPrešov Region11.4
- 3PrešovPrešov Region11.1
- 4LučenecBanská Bystrica Region10.0
- 5RevúcaBanská Bystrica Region9.9
- 6KrompachyKošice Region9.8
- 7KošiceKošice Region9.8
- 8MartinŽilina Region9.8
- 9ŽarnovicaBanská Bystrica Region9.6
- 10PopradPrešov Region9.5
- 11OščadnicaŽilina Region9.5
- 12ČadcaŽilina Region9.5
- 13BardejovPrešov Region9.1
- 14BratislavaBratislava Region9.1
- 15ŽilinaŽilina Region9.0
- 16PúchovTrenčín Region9.0
- 17SninaPrešov Region8.9
- 18TrnavaTrnava Region8.7
- 19TrebišovKošice Region8.6
- 20ZvolenBanská Bystrica Region8.6
+ 15 more cities, 8.6 µg/m³ and below
Not counted on this day, too few days measured: Malacky since 14 May 2025, Senec since 6 May 2025, Pezinok since 6 May 2025 and 4 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 readers for them. Most cities there are missing from this board, not clean. Why.