SmogRank / World / Ireland / Leinster / 2023
Most polluted cities in Leinster, Ireland, 2023
2 cities in Leinster, Ireland ranked by their average PM2.5 over the 365 days; 2 above the WHO annual guideline (5.0 µg/m³). Worst: Dún Laoghaire at 7.3 µg/m³, #973 of 1,302 cities in the world. Cleanest: Dublin at 6.6. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for 56 of these 365 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.
Leinster has 15 cities ranked over the last 30 days, but only 2 here: most of its monitors have no readings for 2023 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.
- 1Dún Laoghaire 411.5×
- 2Dublin 371.3×
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, 2023 · All cities in Ireland, 2023 · Leinster now
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SmogRank, most polluted cities in Leinster, Ireland, PM2.5, 2023, smogrank.com/ie/region/leinster/history/2023 (accessed 6 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.