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 25 Apr 2023: Čaňa 20.8 µg/m³, Revúca 15.7 µg/m³ and Prešov 14.3 µg/m³.
- 1ČaňaKošice Region20.8
- 2RevúcaBanská Bystrica Region15.7
- 3PrešovPrešov Region14.3
- 4KolárovoNitra Region13.8
- 5SenicaTrnava Region13.2
- 6KošiceKošice Region13.1
- 7ŽilinaŽilina Region12.9
- 8TrnavaTrnava Region12.8
- 9Spišská Nová VesKošice Region12.7
- 10MartinŽilina Region12.5
- 11SmižanyKošice Region12.4
- 12HumennéPrešov Region11.5
- 13RužomberokŽilina Region11.3
- 14TrenčínTrenčín Region10.4
- 15PrievidzaTrenčín Region10.3
- 16NitraNitra Region10.3
- 17HnúšťaBanská Bystrica Region10.1
- 18Vranov nad TopľouPrešov Region10.0
- 19PartizánskeTrenčín Region10.0
- 20ZvolenBanská Bystrica Region9.7
+ 5 more cities, 9.7 µg/m³ and below
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 readers for them. Most cities there are missing from this board, not clean. Why.