SmogRank / Countries / Slovakia / May 2025

Most polluted cities in Slovakia, May 2025

31 cities in Slovakia ranked by their average PM2.5 over the 31 days. Worst: Prešov at 9.6 µg/m³, #644 of 2,193 cities in the world. Cleanest: Malacky at 6.3. A city needs measurements on 70% of the days to be ranked.

  1. 1PrešovPrešov Region
    9.6
  2. 2MartinŽilina Region
    9.4
  3. 3HumennéPrešov Region
    9.2
  4. 4PezinokBratislava Region
    9.1
  5. 4ČadcaŽilina Region
    9.1
  6. 6PúchovTrenčín Region
    8.1
  7. 6LučenecBanská Bystrica Region
    8.1
  8. 8BardejovPrešov Region
    8.0
  9. 8ŽilinaŽilina Region
    8.0
  10. 8SenicaTrnava Region
    8.0
  11. 11KošiceKošice Region
    7.8
  12. 11KomárnoNitra Region
    7.8
  13. 13ZvolenBanská Bystrica Region
    7.6
  14. 13TrenčínTrenčín Region
    7.6
  15. 15SninaPrešov Region
    7.5
  16. 15TrnavaTrnava Region
    7.5
  17. 17PopradPrešov Region
    7.4
  18. 17Liptovský Mikulᚎilina Region
    7.4
  19. 17BratislavaBratislava Region
    7.4
  20. 20PartizánskeTrenčín Region
    7.1
  21. 21Žiar nad HronomBanská Bystrica Region
    7.0
  22. 21HandlováTrenčín Region
    7.0
  23. 23Vranov nad TopľouPrešov Region
    6.9
  24. 23TrebišovKošice Region
    6.9
  25. 23SereďTrnava Region
    6.9
  26. 26RužomberokŽilina Region
    6.8
  27. 26PrievidzaTrenčín Region
    6.8
  28. 28Devínska Nová VesBratislava Region
    6.7
  29. 29Banská BystricaBanská Bystrica Region
    6.5
  30. 30NitraNitra Region
    6.3
  31. 30MalackyBratislava Region
    6.3
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

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SmogRank, most polluted cities in Slovakia, PM2.5, May 2025, smogrank.com/sk/history/2025-05 (accessed 1 Oct 2026).

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