SmogRank / Countries / Ireland / Ulster
Most polluted cities in Ulster, Ireland
1 measured city ranked by PM2.5, last 7 days. Worst: Letterkenny at 5.7 µg/m³, #1632 in the world.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Letterkenny Ulster | 5.7 |
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data
Updated 2026-10-01 10:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.