SmogRank / Countries / Portugal / March 2026

Most polluted cities in Portugal, March 2026

7 cities in Portugal ranked by their average PM2.5 over the 31 days. Worst: Porto at 16.7 µg/m³, #413 of 2,332 cities in the world. Cleanest: Vila Real at 3.0. A city needs measurements on 70% of the days to be ranked.

  1. 1Portolow-cost sensorsPorto
    16.7
  2. 2AmoraSetúbal
    7.9
  3. 3CacémLisbon
    5.0
  4. 4CorroiosSetúbal
    4.2
  5. 5FunchalMadeira
    3.4
  6. 6FaroFaro
    3.0
  7. 6Vila RealVila Real
    3.0
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, March 2026 · Portugal now