SmogRank / World / Europe / Ireland

Most polluted cities in Ireland

21 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Letterkenny at 6.4 µg/m³, #1,091 in the world.

Ulster: 1 measured cityLeinster: 12 measured citiesMunster: 6 measured citiesConnacht: 2 measured cities#21 Bray: 4.1 µg/m³#20 Naas: 4.3 µg/m³#19 Greystones: 4.4 µg/m³#18 Leixlip: 4.7 µg/m³#17 Dún Laoghaire: 4.8 µg/m³#15 Dundalk: 4.9 µg/m³#16 Cluain Meala: 4.9 µg/m³#14 Cork: 5.0 µg/m³#12 Navan: 5.1 µg/m³#13 Limerick: 5.1 µg/m³#11 Carlow: 5.2 µg/m³#9 Dublin: 5.3 µg/m³#10 Drogheda: 5.3 µg/m³#7 Tralee: 5.4 µg/m³#8 Athlone: 5.4 µg/m³#6 Ennis: 5.6 µg/m³#5 Sligo: 5.7 µg/m³#4 Wexford: 5.8 µg/m³#3 Waterford: 6.0 µg/m³#2 Galway: 6.3 µg/m³#1 Letterkenny: 6.4 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city, or a region to zoom in.
← Letterkenny 6.4 WHO 24-hour guideline
Every measured city in Ireland, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1LetterkennyUlster 6.4
  2. 2GalwayConnacht 6.3
  3. 3WaterfordMunster 6.0
  4. 4WexfordLeinster 5.8
  5. 5SligoConnacht 5.7
  6. 6EnnisMunster 5.6
  7. 7TraleeMunster 5.4
  8. 8AthloneLeinster 5.4
  9. 9DublinLeinster 5.3
  10. 10DroghedaLeinster 5.3
  11. 11CarlowLeinster 5.2
  12. 12NavanLeinster 5.1
  13. 13LimerickMunster 5.1
  14. 14CorkMunster 5.0
  15. 15DundalkLeinster 4.9
  16. 16Cluain MealaMunster 4.9
  17. 17Dún LaoghaireLeinster 4.8
  18. 18LeixlipLeinster 4.7
  19. 19GreystonesLeinster 4.4
  20. 20NaasLeinster 4.3
  21. 21BrayLeinster 4.1
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Estimated: cities without a monitor

Ireland cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Douglas≈ 6 µg/m³Good
Droichead Nua≈ 4 µg/m³Good
An Muileann gCearr≈ 4 µg/m³Good
Sandyford≈ 5 µg/m³Good
Balbriggan≈ 6 µg/m³Good
Kilkenny≈ 5 µg/m³Good
Celbridge≈ 5 µg/m³Good
Finglas≈ 5 µg/m³Good
Ballincollig≈ 6 µg/m³Good
Carrigaline≈ 6 µg/m³Good
Rathfarnham≈ 5 µg/m³Good
Maynooth≈ 5 µg/m³Good
Malahide≈ 6 µg/m³Good
Tullamore≈ 4 µg/m³Good
Lucan≈ 5 µg/m³Good

Use this board

SmogRank, most polluted cities in Ireland, PM2.5, last 30 days to 2 Oct 2026, 01:00 UTC, smogrank.com/ie?w=30d.

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Regions

Connacht 2Leinster 12Munster 6Ulster 1

Measured cities in each region (30 days).

Updated 2026-10-02 01:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.