SmogRank / World / United Kingdom / Northern Ireland / May 2025
Most polluted cities in Northern Ireland, United Kingdom, May 2025
2 cities in Northern Ireland, United Kingdom ranked by their average PM2.5 over the 31 days. Worst: Belfast at 7.5 µg/m³, #1,441 of 2,771 cities in the world. Cleanest: Derry at 3.3. A city needs measurements on 70% of the days to be ranked.
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
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SmogRank, most polluted cities in Northern Ireland, United Kingdom, PM2.5, May 2025, smogrank.com/gb/region/northern-ireland/history/2025-05 (accessed 7 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.