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 Jul 2026: Prešov 13.4 µg/m³, Košice 13.1 µg/m³ and Nitra 13.0 µg/m³.
- 1PrešovPrešov Region13.4
- 2KošiceKošice Region13.1
- 3NitraNitra Region13.0
- 4TrebišovKošice Region12.8
- 5TrnavaTrnava Region12.7
- 6KomárnoNitra Region12.7
- 7ZvolenBanská Bystrica Region12.6
- 8Vranov nad TopľouPrešov Region12.5
- 9MalackyBratislava Region12.4
- 10Chorvátsky Grob - Čierna VodaBratislava Region12.4
- 11ŽilinaŽilina Region12.3
- 12SereďTrnava Region12.3
- 13HumennéPrešov Region12.2
- 14ČaňaKošice Region12.2
- 15BardejovPrešov Region12.1
- 16SenecBratislava Region12.1
- 17MartinŽilina Region12.1
- 18SenicaTrnava Region11.9
- 19PopradPrešov Region11.8
- 20SninaPrešov Region11.5
+ 19 more cities, 11.5 µg/m³ and below
Not counted on this day, too few days measured: Krompachy since 2 Jul 2026 and Trenčín since 28 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.