SmogRank / History / City race
Cities in Chile, 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 Chile for PM2.5 over the 30 days to 13 Nov 2025: Hualpén 28.2 µg/m³, Puerto Varas 28.1 µg/m³ and Puente Alto 24.9 µg/m³.
- 1HualpénBiobio28.2
- 2Puerto VarasLos Lagos Region28.1
- 3Puente AltoSantiago Metropolitan24.9
- 4TocopillaAntofagasta24.4
- 5ConcónValparaiso23.9
- 6AricaArica y Parinacota Region23.7
- 7CoyhaiqueAysén23.1
- 8PuchuncavíValparaiso21.6
- 9OsornoLos Lagos Region21.5
- 10SantiagoSantiago Metropolitan21.0
- 11QuinteroValparaiso20.9
- 12Puerto MonttLos Lagos Region20.6
- 13VillarricaAraucania20.5
- 14RancaguaO'Higgins Region20.3
- 15CopiapóAtacama20.3
- 16TalaganteSantiago Metropolitan20.1
- 17La SerenaCoquimbo Region19.1
- 18CoronelBiobio18.5
- 19Alto HospicioTarapacá18.4
- 20AntofagastaAntofagasta18.3
+ 16 more cities, 18.1 µg/m³ and below
Not counted on this day, too few days measured: Quilpué since 10 Nov 2025, Curanilahue since 10 Nov 2025, Tomé since 4 Nov 2025 and 6 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.