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 24 Feb 2023: Spišská Nová Ves 36.2 µg/m³, Ružomberok 34.2 µg/m³ and Čadca 30.8 µg/m³.
- 1Spišská Nová VesKošice Region36.2
- 2RužomberokŽilina Region34.2
- 3ČadcaŽilina Region30.8
- 4LučenecBanská Bystrica Region28.8
- 5TrebišovKošice Region27.6
- 6MartinŽilina Region26.6
- 7HumennéPrešov Region26.5
- 8Liptovský Mikulᚎilina Region26.3
- 9ŽilinaŽilina Region25.7
- 10PrešovPrešov Region25.6
- 11KošiceKošice Region25.6
- 12PúchovTrenčín Region24.8
- 13BardejovPrešov Region24.7
- 14Banská BystricaBanská Bystrica Region23.0
- 15Vranov nad TopľouPrešov Region22.7
- 16ZvolenBanská Bystrica Region21.1
- 17TrenčínTrenčín Region20.5
- 18PartizánskeTrenčín Region19.7
- 19PrievidzaTrenčín Region19.6
- 20MalackyBratislava Region19.4
+ 12 more cities, 19.1 µg/m³ and below
Not counted on this day, too few days measured: Veľká Lomnica since 3 Feb 2023, Smižany since 3 Feb 2023, Kolárovo since 3 Feb 2023 and Hnúšťa since 3 Feb 2023. 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.