SmogRank / Countries / Ireland / April 2026

Most polluted cities in Ireland, April 2026

22 cities in Ireland ranked by their average PM2.5 over the 30 days. Worst: Waterford at 8.4 µg/m³, #1,032 of 2,283 cities in the world. Cleanest: Sligo at 5.6. A city needs measurements on 70% of the days to be ranked.

  1. 1WaterfordMunster
    8.4
  2. 2TraleeMunster
    8.2
  3. 3WexfordLeinster
    8.0
  4. 4EnnisMunster
    7.9
  5. 5Dún LaoghaireLeinster
    7.8
  6. 6CorkMunster
    7.7
  7. 7DublinLeinster
    7.6
  8. 8NavanLeinster
    7.0
  9. 8AthloneLeinster
    7.0
  10. 10LeixlipLeinster
    6.8
  11. 11LetterkennyUlster
    6.7
  12. 12PortlaoiseLeinster
    6.6
  13. 12GalwayConnacht
    6.6
  14. 12DroghedaLeinster
    6.6
  15. 15GreystonesLeinster
    6.5
  16. 16Cluain MealaMunster
    6.4
  17. 17TallaghtLeinster
    6.3
  18. 18NaasLeinster
    6.1
  19. 18CarlowLeinster
    6.1
  20. 20BrayLeinster
    5.9
  21. 21LimerickMunster
    5.7
  22. 22SligoConnacht
    5.6
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, April 2026 · Ireland now

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SmogRank, most polluted cities in Ireland, PM2.5, April 2026, smogrank.com/ie/history/2026-04 (accessed 2 Oct 2026).

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