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 Oct 2023: Čaňa 16.0 µg/m³, Revúca 14.2 µg/m³ and Trnava 14.0 µg/m³.
- 1ČaňaKošice Region16.0
- 2RevúcaBanská Bystrica Region14.2
- 3TrnavaTrnava Region14.0
- 4HumennéPrešov Region13.3
- 5KošiceKošice Region13.0
- 6MartinŽilina Region12.9
- 7KolárovoNitra Region12.8
- 8PrešovPrešov Region12.6
- 9Spišská Nová VesKošice Region11.6
- 10SmižanyKošice Region11.6
- 11ŽilinaŽilina Region11.2
- 12SenicaTrnava Region11.2
- 13NitraNitra Region11.2
- 14Vranov nad TopľouPrešov Region11.0
- 15TrenčínTrenčín Region11.0
- 16RužomberokŽilina Region10.8
- 17ZvolenBanská Bystrica Region9.9
- 18BratislavaBratislava Region9.9
- 19PrievidzaTrenčín Region9.8
- 20SninaPrešov Region9.7
+ 7 more cities, the next at 9.1 µg/m³
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.