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 28 Apr 2023: Čaňa 21.6 µg/m³, Revúca 16.4 µg/m³ and Kolárovo 15.0 µg/m³.
- 1ČaňaKošice Region21.6
- 2RevúcaBanská Bystrica Region16.4
- 3KolárovoNitra Region15.0
- 4PrešovPrešov Region14.9
- 5KošiceKošice Region13.6
- 6SenicaTrnava Region13.6
- 7ŽilinaŽilina Region13.3
- 8TrnavaTrnava Region13.3
- 9Spišská Nová VesKošice Region13.2
- 10SmižanyKošice Region12.9
- 11MartinŽilina Region12.9
- 12HumennéPrešov Region12.3
- 13RužomberokŽilina Region11.6
- 14NitraNitra Region10.6
- 15Vranov nad TopľouPrešov Region10.4
- 16PrievidzaTrenčín Region10.4
- 17HnúšťaBanská Bystrica Region10.4
- 18TrenčínTrenčín Region10.3
- 19ZvolenBanská Bystrica Region10.2
- 20PartizánskeTrenčín Region10.2
+ 5 more cities, the next at 10.1 µg/m³
Not counted on this day, too few days measured: Trebišov since 30 Mar 2023, Poprad since 30 Mar 2023, Bardejov since 30 Mar 2023 and 11 more cities. Days missing from the source archive fall in this window, so fewer countries are counted.
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.