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 May 2023: Čaňa 21.6 µg/m³, Revúca 14.6 µg/m³ and Prešov 13.7 µg/m³.
- 1ČaňaKošice Region21.6
- 2RevúcaBanská Bystrica Region14.6
- 3PrešovPrešov Region13.7
- 4HumennéPrešov Region12.4
- 5TrnavaTrnava Region12.4
- 6Spišská Nová VesKošice Region12.2
- 7SmižanyKošice Region12.2
- 8SenicaTrnava Region12.2
- 9KošiceKošice Region11.9
- 10MartinŽilina Region11.0
- 11Vranov nad TopľouPrešov Region10.9
- 12ŽilinaŽilina Region10.8
- 13KolárovoNitra Region10.3
- 14BratislavaBratislava Region9.9
- 15SninaPrešov Region9.5
- 16RužomberokŽilina Region9.5
- 17NitraNitra Region9.4
- 18ZvolenBanská Bystrica Region9.1
- 19HnúšťaBanská Bystrica Region8.4
- 20PrievidzaTrenčín Region8.2
+ 5 more cities, 8.2 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 10 more cities.
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.