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 22 Sep 2023: Čaňa 16.4 µg/m³, Prešov 13.5 µg/m³ and Trnava 13.3 µg/m³.
- 1ČaňaKošice Region16.4
- 2PrešovPrešov Region13.5
- 3TrnavaTrnava Region13.3
- 4KolárovoNitra Region12.3
- 5KošiceKošice Region12.2
- 6MartinŽilina Region12.2
- 7HumennéPrešov Region11.7
- 8NitraNitra Region11.3
- 9SenicaTrnava Region11.2
- 10Spišská Nová VesKošice Region10.6
- 11SmižanyKošice Region10.6
- 12ŽilinaŽilina Region10.5
- 13ZvolenBanská Bystrica Region10.4
- 14BratislavaBratislava Region10.2
- 15RevúcaBanská Bystrica Region10.1
- 16Žiar nad HronomBanská Bystrica Region10.0
- 17PrievidzaTrenčín Region10.0
- 18Vranov nad TopľouPrešov Region9.9
- 19PartizánskeTrenčín Region9.4
- 20RužomberokŽilina Region8.8
+ 7 more cities, 8.7 µg/m³ and below
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.