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 Mar 2023: Spišská Nová Ves 21.9 µg/m³, Humenné 20.5 µg/m³ and Prešov 19.3 µg/m³.
- 1Spišská Nová VesKošice Region21.9
- 2HumennéPrešov Region20.5
- 3PrešovPrešov Region19.3
- 4KošiceKošice Region19.2
- 5ŽilinaŽilina Region19.1
- 6LučenecBanská Bystrica Region18.7
- 7TrebišovKošice Region18.1
- 8PúchovTrenčín Region17.7
- 9ČadcaŽilina Region17.7
- 10RužomberokŽilina Region17.1
- 11TrenčínTrenčín Region16.7
- 12SenicaTrnava Region16.4
- 13MartinŽilina Region16.3
- 14BardejovPrešov Region16.2
- 15TrnavaTrnava Region15.8
- 16Vranov nad TopľouPrešov Region15.7
- 17Banská BystricaBanská Bystrica Region15.7
- 18SenecBratislava Region15.4
- 19PrievidzaTrenčín Region14.9
- 20ZvolenBanská Bystrica Region14.6
+ 12 more cities, 14.2 µg/m³ and below
Not counted on this day, too few days measured: Malacky since 24 Mar 2023, Veľká Lomnica since 3 Feb 2023, Smižany since 3 Feb 2023 and 2 more cities. 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.