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 Feb 2024: Revúca 33.1 µg/m³, Šahy 31.1 µg/m³ and Krompachy 25.0 µg/m³.
- 1RevúcaBanská Bystrica Region33.1
- 2ŠahyNitra Region31.1
- 3KrompachyKošice Region25.0
- 4ŽarnovicaBanská Bystrica Region24.9
- 5TrebišovKošice Region23.5
- 6LučenecBanská Bystrica Region23.4
- 7Vranov nad TopľouPrešov Region23.3
- 8ČaňaKošice Region23.0
- 9KošiceKošice Region22.9
- 10HumennéPrešov Region22.2
- 11PrešovPrešov Region21.8
- 12ČadcaŽilina Region20.3
- 13PúchovTrenčín Region20.2
- 14HnúšťaBanská Bystrica Region19.9
- 15BardejovPrešov Region19.8
- 16OščadnicaŽilina Region19.2
- 17ŽilinaŽilina Region18.3
- 18PrievidzaTrenčín Region16.4
- 19MartinŽilina Region16.1
- 20RužomberokŽilina Region16.0
+ 22 more cities, the next at 15.4 µg/m³
Not counted on this day, too few days measured: Karlova Ves since 8 Feb 2024, Spišská Nová Ves since 7 Feb 2024 and Smižany since 6 Feb 2024. 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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.