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 11 Jun 2026: Čaňa 12.7 µg/m³, Prešov 10.6 µg/m³ and Krompachy 10.2 µg/m³.
- 1ČaňaKošice Region12.7
- 2PrešovPrešov Region10.6
- 3KrompachyKošice Region10.2
- 4HumennéPrešov Region9.7
- 5SninaPrešov Region9.4
- 6KošiceKošice Region9.4
- 7KomárnoNitra Region9.0
- 8BardejovPrešov Region8.9
- 9TrebišovKošice Region8.8
- 10PopradPrešov Region8.7
- 11ZvolenBanská Bystrica Region8.6
- 12Vranov nad TopľouPrešov Region8.5
- 13MartinŽilina Region8.4
- 14TrenčínTrenčín Region8.3
- 15NitraNitra Region8.1
- 16LučenecBanská Bystrica Region8.0
- 17SenecBratislava Region7.9
- 18Veľká LomnicaPrešov Region7.8
- 19ŽilinaŽilina Region7.8
- 20ŽarnovicaBanská Bystrica Region7.7
+ 19 more cities, 7.7 µg/m³ and below
Not counted on this day, too few days measured: Banská Bystrica since 11 Jun 2026 and Malacky since 9 Jun 2026.
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.