SmogRank / Countries / Portugal / December 2025

Most polluted cities in Portugal, December 2025

3 cities in Portugal ranked by their average PM2.5 over the 31 days. Worst: Porto at 21.9 µg/m³, #316 of 2,360 cities in the world. Cleanest: Faro at 2.4. A city needs measurements on 70% of the days to be ranked.

  1. 1Portolow-cost sensorsPorto
    21.9
  2. 2FunchalMadeira
    2.8
  3. 3FaroFaro
    2.4
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, December 2025 · Portugal now