SmogRank / World / Spain / Asturias / January 2023
Most polluted cities in Asturias, Spain, January 2023
2 cities in Asturias, Spain ranked by their average PM2.5 over the 31 days. Worst: Oviedo at 11.7 µg/m³, #357 of 1,225 cities in the world. Cleanest: Sama at 10.4. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for 7 of these 31 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.
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.
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, January 2023 · All cities in Spain, January 2023 · Asturias now
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SmogRank, most polluted cities in Asturias, Spain, PM2.5, January 2023, smogrank.com/es/region/asturias/history/2023-01 (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.