SmogRank / Countries / Portugal / August 2026

Most polluted cities in Portugal, August 2026

2 cities in Portugal ranked by their average PM2.5 over the 31 days. Worst: Porto at 11.1 µg/m³, #460 of 2,312 cities in the world. Cleanest: Vila Real at 3.9. A city needs measurements on 70% of the days to be ranked.

  1. 1Portolow-cost sensorsPorto
    11.1
  2. 2Vila RealVila Real
    3.9
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, August 2026 · Portugal now