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 to13 Apr 2025 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 13 Apr 2025: Čaňa 19.1 µg/m³, Šahy 19.1 µg/m³ and Lučenec 17.6 µg/m³.

  1. 1ČaňaKošice Region19.1
  2. 2ŠahyNitra Region19.1
  3. 3LučenecBanská Bystrica Region17.6
  4. 4RevúcaBanská Bystrica Region17.4
  5. 5OščadnicaŽilina Region17.4
  6. 6ČadcaŽilina Region17.4
  7. 7ŽarnovicaBanská Bystrica Region17.2
  8. 8MartinŽilina Region17.1
  9. 9ŽilinaŽilina Region16.3
  10. 10PrešovPrešov Region15.9
  11. 11HumennéPrešov Region15.8
  12. 12PúchovTrenčín Region15.8
  13. 13RužomberokŽilina Region15.1
  14. 14KrompachyKošice Region14.6
  15. 15TrenčínTrenčín Region14.3
  16. 16TrebišovKošice Region13.9
  17. 17KošiceKošice Region13.8
  18. 18PezinokBratislava Region13.8
  19. 19Vranov nad TopľouPrešov Region13.5
  20. 20SenicaTrnava Region13.3

+ 22 more cities, 13.3 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.