SmogRank / World / United Kingdom / Wales / 2024
Most polluted cities in Wales, United Kingdom, 2024
2 cities in Wales, United Kingdom ranked by their average PM2.5 over the 366 days; 2 above the WHO annual guideline (5.0 µg/m³). Worst: Cwmafan at 7.8 µg/m³, #1,161 of 2,052 cities in the world. Cleanest: Newport 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 one of these days. Cities in the United States and Europe have it 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.
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 Wales, United Kingdom, PM2.5, 2024, smogrank.com/gb/region/wales/history/2024 (accessed 8 Oct 2026). Some readings from Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published.
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.