SmogRank / Countries / Portugal / September 2026

Most polluted cities in Portugal, September 2026

4 cities in Portugal ranked by their average PM2.5 over the 30 days. Worst: Porto at 14.4 µg/m³, #247 of 2,332 cities in the world. Cleanest: Vila Real at 3.8. A city needs measurements on 70% of the days to be ranked.

  1. 1Portolow-cost sensorsPorto
    14.4
  2. 2FunchalMadeira
    7.0
  3. 3ParedesPorto
    4.8
  4. 4Vila RealVila Real
    3.8
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, September 2026 · Portugal now