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 13 May 2025: Čaňa 15.5 µg/m³, Humenné 11.4 µg/m³ and Prešov 11.2 µg/m³.
- 1ČaňaKošice Region15.5
- 2HumennéPrešov Region11.4
- 3PrešovPrešov Region11.2
- 4RevúcaBanská Bystrica Region10.4
- 5LučenecBanská Bystrica Region10.2
- 6KrompachyKošice Region10.0
- 7KošiceKošice Region10.0
- 8MartinŽilina Region9.8
- 9ŽarnovicaBanská Bystrica Region9.6
- 10PopradPrešov Region9.5
- 11OščadnicaŽilina Region9.3
- 12ČadcaŽilina Region9.3
- 13BratislavaBratislava Region9.1
- 14BardejovPrešov Region9.0
- 15SninaPrešov Region8.9
- 16ŽilinaŽilina Region8.9
- 17PúchovTrenčín Region8.9
- 18TrebišovKošice Region8.8
- 19ZvolenBanská Bystrica Region8.7
- 20ŠahyNitra Region8.7
+ 16 more cities, 8.7 µg/m³ and below
Not counted on this day, too few days measured: Senec since 6 May 2025, Pezinok since 6 May 2025, Veľká Lomnica since 5 May 2025 and 3 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.