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 16 Jun 2025: Prešov 11.7 µg/m³, Čaňa 11.5 µg/m³ and Krompachy 10.9 µg/m³.
- 1PrešovPrešov Region11.7
- 2ČaňaKošice Region11.5
- 3KrompachyKošice Region10.9
- 4PezinokBratislava Region10.8
- 5HumennéPrešov Region10.2
- 6PopradPrešov Region10.1
- 7KošiceKošice Region10.0
- 8MartinŽilina Region9.7
- 9TrebišovKošice Region9.4
- 10TrenčínTrenčín Region9.4
- 11BardejovPrešov Region9.3
- 12ŽarnovicaBanská Bystrica Region9.3
- 13LučenecBanská Bystrica Region9.3
- 14ZvolenBanská Bystrica Region9.2
- 15PúchovTrenčín Region9.0
- 16RevúcaBanská Bystrica Region8.9
- 17TrnavaTrnava Region8.9
- 18SenicaTrnava Region8.9
- 19BratislavaBratislava Region8.9
- 20KomárnoNitra Region8.7
+ 19 more cities, the next at 8.5 µg/m³
Not counted on this day, too few days measured: Snina since 15 Jun 2025 and Banská Bystrica since 15 Jun 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 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.