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.

CountriesCities
The 30 days to27 Jun 2023 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 27 Jun 2023: Čaňa 19.7 µg/m³, Trnava 15.2 µg/m³ and Prešov 14.9 µg/m³.

  1. 1ČaňaKošice Region19.7
  2. 2TrnavaTrnava Region15.2
  3. 3PrešovPrešov Region14.9
  4. 4SenicaTrnava Region14.8
  5. 5KošiceKošice Region13.9
  6. 6MartinŽilina Region13.7
  7. 7HumennéPrešov Region13.3
  8. 8Spišská Nová VesKošice Region12.7
  9. 9SmižanyKošice Region12.7
  10. 10NitraNitra Region12.7
  11. 11BratislavaBratislava Region12.1
  12. 12RužomberokŽilina Region11.9
  13. 13ŽilinaŽilina Region11.6
  14. 14KolárovoNitra Region11.1
  15. 15Vranov nad TopľouPrešov Region10.9
  16. 16ZvolenBanská Bystrica Region10.8
  17. 17TrenčínTrenčín Region10.5
  18. 18Veľká LomnicaPrešov Region10.3
  19. 19PartizánskeTrenčín Region10.2
  20. 20Žiar nad HronomBanská Bystrica Region10.0

+ 7 more cities, the next at 9.8 µg/m³

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that 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.