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 18 Mar 2025: Šahy 36.9 µg/m³, Čaňa 35.6 µg/m³ and Revúca 31.7 µg/m³.
- 1ŠahyNitra Region36.9
- 2ČaňaKošice Region35.6
- 3RevúcaBanská Bystrica Region31.7
- 4LučenecBanská Bystrica Region31.1
- 5ŽarnovicaBanská Bystrica Region31.0
- 6MartinŽilina Region27.4
- 7ŽilinaŽilina Region27.3
- 8PrešovPrešov Region26.8
- 9TrebišovKošice Region26.7
- 10HumennéPrešov Region26.4
- 11PúchovTrenčín Region26.1
- 12RužomberokŽilina Region25.8
- 13KrompachyKošice Region25.0
- 14KošiceKošice Region24.9
- 15OščadnicaŽilina Region24.2
- 16ČadcaŽilina Region24.2
- 17TrenčínTrenčín Region23.5
- 18PezinokBratislava Region23.4
- 19HnúšťaBanská Bystrica Region21.0
- 20BratislavaBratislava Region21.0
+ 19 more cities, the next at 20.9 µg/m³
Not counted on this day, too few days measured: Senec since 18 Mar 2025, Malacky since 6 Mar 2025 and Vranov nad Topľou since 3 Mar 2025.
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.