SmogRank / Countries / Portugal / May 2025
Most polluted cities in Portugal, May 2025
2 cities in Portugal ranked by their average PM2.5 over the 31 days. Worst: Funchal at 3.6 µg/m³, #2,083 of 2,187 cities in the world. Cleanest: Faro at 2.6. A city needs measurements on 70% of the days to be ranked.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+
All cities in the world, May 2025 · Portugal now
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SmogRank, most polluted cities in Portugal, PM2.5, May 2025, smogrank.com/pt/history/2025-05 (accessed 2 Oct 2026).
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