SmogRank / Countries / Portugal / 2026

Most polluted cities in Portugal, 2026

3 cities in Portugal ranked by their average PM2.5 so far (273 of 365 days); 1 above the WHO annual guideline (5.0 µg/m³). Worst: Porto at 13.9 µg/m³, #360 of 2,181 cities in the world. Cleanest: Vila Real at 3.7. A city needs measurements on 70% of the days to be ranked.

  1. 1Portolow-cost sensorsPorto
    13.92.8×
  2. 2FunchalMadeira
    4.40.9×
  3. 3Vila RealVila Real
    3.70.7×
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, 2026 · Portugal now