SmogRank / Countries / Ireland / September 2025

Most polluted cities in Ireland, September 2025

4 cities in Ireland ranked by their average PM2.5 over the 30 days. Worst: Galway at 5.3 µg/m³, #1,904 of 2,439 cities in the world. Cleanest: Leixlip at 3.7. A city needs measurements on 70% of the days to be ranked.

  1. 1GalwayConnacht
    5.3
  2. 2DublinLeinster
    4.5
  3. 3LimerickMunster
    3.9
  4. 4LeixlipLeinster
    3.7
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, September 2025 · Ireland now

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SmogRank, most polluted cities in Ireland, PM2.5, September 2025, smogrank.com/ie/history/2025-09 (accessed 2 Oct 2026).

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