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 to24 Jul 2023 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 24 Jul 2023: Čaňa 17.2 µg/m³, Trnava 16.1 µg/m³ and Prešov 15.8 µg/m³.

  1. 1ČaňaKošice Region17.2
  2. 2TrnavaTrnava Region16.1
  3. 3PrešovPrešov Region15.8
  4. 4KošiceKošice Region14.9
  5. 5NitraNitra Region14.4
  6. 6MartinŽilina Region13.9
  7. 7SmižanyKošice Region13.0
  8. 8BratislavaBratislava Region13.0
  9. 9Spišská Nová VesKošice Region12.9
  10. 10SenicaTrnava Region12.9
  11. 11HumennéPrešov Region12.5
  12. 12ŽilinaŽilina Region11.8
  13. 13KolárovoNitra Region11.7
  14. 14RužomberokŽilina Region11.5
  15. 15Vranov nad TopľouPrešov Region11.4
  16. 16PartizánskeTrenčín Region11.2
  17. 17ZvolenBanská Bystrica Region11.0
  18. 18Žiar nad HronomBanská Bystrica Region11.0
  19. 19PrievidzaTrenčín Region10.3
  20. 20Veľká LomnicaPrešov Region10.2

+ 7 more cities, 9.9 µg/m³ and below

Days missing from the source archive fall in this window, so fewer countries are counted.

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.