SmogRank / World / Slovakia / January 2023

Most polluted cities in Slovakia, January 2023

20 cities in Slovakia ranked by their average PM2.5 over the 31 days. Worst: Ružomberok at 22.4 µg/m³, #63 of 993 cities in the world. Cleanest: Poprad at 7.3. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 7 of these 31 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.

← Ružomberok 22.4
Every city in Slovakia ranked for January 2023, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1RužomberokŽilina Region
    76
  2. 2Spišská Nová VesKošice Region
    74
  3. 3ŽilinaŽilina Region
    67
  4. 4ZvolenBanská Bystrica Region
    66
  5. 5PrešovPrešov Region
    65
  6. 6KošiceKošice Region
    64
  7. 7HumennéPrešov Region
    64
  8. 8SenicaTrnava Region
    63
  9. 9Vranov nad TopľouPrešov Region
    63
  10. 9MartinŽilina Region
    63
  11. 11PrievidzaTrenčín Region
    62
  12. 11Banská BystricaBanská Bystrica Region
    62
  13. 13NitraNitra Region
    61
  14. 14TrnavaTrnava Region
    60
  15. 14TrenčínTrenčín Region
    60
  16. 16PartizánskeTrenčín Region
    59
  17. 17Žiar nad HronomBanská Bystrica Region
    58
  18. 18BratislavaBratislava Region
    57
  19. 19SninaPrešov Region
    43
  20. 20PopradPrešov Region
    41
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, January 2023 · Slovakia now

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SmogRank, most polluted cities in Slovakia, PM2.5, January 2023, smogrank.com/sk/history/2023-01 (accessed 2 Oct 2026).

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