SmogRank / History / City race
Cities in Portugal, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in Portugal for PM2.5 over the 30 days to 9 May 2026: Funchal 4.0 µg/m³, Vila Real 4.0 µg/m³ and Santiago do Cacém 3.9 µg/m³.
- 1FunchalMadeira4.0
- 2Vila RealVila Real4.0
- 3Santiago do CacémSetúbal3.9
Not counted on this day, too few days measured: Faro since 22 Apr 2026, Porto since 17 Apr 2026, Paredes since 16 Apr 2026 and 2 more cities.
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.