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 to21 Sep 2023 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 21 Sep 2023: Čaňa 16.7 µg/m³, Trnava 13.8 µg/m³ and Prešov 13.7 µg/m³.

  1. 1ČaňaKošice Region16.7
  2. 2TrnavaTrnava Region13.8
  3. 3PrešovPrešov Region13.7
  4. 4MartinŽilina Region12.4
  5. 5KolárovoNitra Region12.4
  6. 6KošiceKošice Region12.3
  7. 7HumennéPrešov Region12.0
  8. 8NitraNitra Region11.7
  9. 9SenicaTrnava Region11.2
  10. 10ŽilinaŽilina Region10.7
  11. 11BratislavaBratislava Region10.7
  12. 12Spišská Nová VesKošice Region10.6
  13. 13SmižanyKošice Region10.6
  14. 14ZvolenBanská Bystrica Region10.6
  15. 15Žiar nad HronomBanská Bystrica Region10.3
  16. 16RevúcaBanská Bystrica Region10.2
  17. 17PrievidzaTrenčín Region10.1
  18. 18Vranov nad TopľouPrešov Region10.0
  19. 19PartizánskeTrenčín Region9.7
  20. 20SninaPrešov Region8.9

+ 7 more cities, 8.8 µg/m³ and below

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 readers for them. Most cities there are missing from this board, not clean. Why.