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 23 Feb 2023: Spišská Nová Ves 35.8 µg/m³, Ružomberok 34.2 µg/m³ and Martin 26.5 µg/m³.
- 1Spišská Nová VesKošice Region35.8
- 2RužomberokŽilina Region34.2
- 3MartinŽilina Region26.5
- 4HumennéPrešov Region25.8
- 5ŽilinaŽilina Region25.5
- 6PrešovPrešov Region24.8
- 7KošiceKošice Region24.6
- 8Banská BystricaBanská Bystrica Region22.9
- 9Vranov nad TopľouPrešov Region21.8
- 10ZvolenBanská Bystrica Region21.1
- 11TrenčínTrenčín Region20.3
- 12PrievidzaTrenčín Region19.5
- 13PartizánskeTrenčín Region19.5
- 14SenicaTrnava Region18.9
- 15NitraNitra Region16.9
- 16TrnavaTrnava Region16.8
- 17Žiar nad HronomBanská Bystrica Region15.2
- 18BratislavaBratislava Region14.9
- 19SninaPrešov Region13.8
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.