SmogRank / Countries / Portugal / January 2026

Most polluted cities in Portugal, January 2026

3 cities in Portugal ranked by their average PM2.5 over the 31 days. Worst: Porto at 16.6 µg/m³, #425 of 2,047 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
    16.6
  2. 2FunchalMadeira
    3.5
  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, January 2026 · Portugal now