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 7 Aug 2026: Komárno 14.6 µg/m³, Trnava 14.3 µg/m³ and Prešov 13.5 µg/m³.
- 1KomárnoNitra Region14.6
- 2TrnavaTrnava Region14.3
- 3PrešovPrešov Region13.5
- 4TrebišovKošice Region13.3
- 5KošiceKošice Region12.7
- 6SenicaTrnava Region12.2
- 7ŽilinaŽilina Region12.0
- 8Chorvátsky Grob - Čierna VodaBratislava Region11.7
- 9NitraNitra Region11.6
- 10KrompachyKošice Region11.5
- 11HumennéPrešov Region11.5
- 12MalackyBratislava Region11.5
- 13Vranov nad TopľouPrešov Region11.4
- 14SninaPrešov Region11.2
- 15SenecBratislava Region11.2
- 16BardejovPrešov Region11.1
- 17SereďTrnava Region11.0
- 18PúchovTrenčín Region10.9
- 19MartinŽilina Region10.9
- 20Liptovský Mikulᚎilina Region10.9
+ 20 more cities, 10.8 µg/m³ and below
Not counted on this day, too few days measured: Čaňa since 5 Aug 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.