SmogRank / Countries / Portugal / May 2026

Most polluted cities in Portugal, May 2026

4 cities in Portugal ranked by their average PM2.5 over the 31 days. Worst: Porto at 12.5 µg/m³, #287 of 2,243 cities in the world. Cleanest: Faro at 2.3. A city needs measurements on 70% of the days to be ranked.

  1. 1Portolow-cost sensorsPorto
    12.5
  2. 2FunchalMadeira
    3.4
  3. 2Vila RealVila Real
    3.4
  4. 4FaroFaro
    2.3
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, May 2026 · Portugal now