SmogRank / World / Ireland / Connacht / February 2026

Most polluted cities in Connacht, Ireland, February 2026

1 city in Connacht, Ireland ranked by their average PM2.5 over the 28 days. The only one: Roscommon at 7.4 µg/m³, #2,120 of 2,841 cities in the world. A city needs measurements on 70% of the days to be ranked.

  1. 1Roscommon
    41
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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 Connacht, Ireland, PM2.5, February 2026, smogrank.com/ie/region/connacht/history/2026-02 (accessed 7 Oct 2026).

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