SmogRank / World / Portugal / January 2023
Most polluted cities in Portugal, January 2023
2 cities in Portugal ranked by their average PM2.5 over the 31 days. Worst: Funchal at 3.2 µg/m³, #962 of 993 cities in the world. Cleanest: Faro at 2.9. 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.
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 · Portugal now
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SmogRank, most polluted cities in Portugal, PM2.5, January 2023, smogrank.com/pt/history/2023-01 (accessed 2 Oct 2026).
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