SmogRank / World / Europe / Ireland / Connacht
Most polluted cities in Connacht, Ireland
2 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Galway at 6.5 µg/m³, #1,552 in the world.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
Not on this map: #1 Galway 6.5.
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
Bad-air episodes in Connacht
- Europe, 18 to 25 March 20268 days430 cities136 µg/m³peak, Łask
- Germany, Poland and 25 more countries, March 20253 to 13 March 2025, 11 days553 cities152 µg/m³peak, Negotin
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
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SmogRank, most polluted cities in Connacht, Ireland, PM2.5, last 30 days to 7 Oct 2026, 00:00 UTC, smogrank.com/ie/region/connacht?w=30d.
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.
Updated 2026-10-07 00:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.