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 15 Aug 2025: Coyhaique 103.2 µg/m³, Nacimiento 70.8 µg/m³ and Osorno 64.0 µg/m³.
- 1CoyhaiqueAysén103.2
- 2NacimientoBiobio70.8
- 3OsornoLos Lagos Region64.0
- 4LinaresMaule Region63.4
- 5CuricóMaule Region59.9
- 6LajaBiobio56.5
- 7VillarricaAraucania56.0
- 8Puerto VarasLos Lagos Region54.6
- 9RengoO'Higgins Region52.6
- 10San CarlosÑuble52.1
- 11TalaganteSantiago Metropolitan50.6
- 12TemucoAraucania50.0
- 13RancaguaO'Higgins Region49.2
- 14SantiagoSantiago Metropolitan47.9
- 15HualpénBiobio47.4
- 16ChillánÑuble46.0
- 17Puerto MonttLos Lagos Region45.3
- 18Los ÁngelesBiobio43.3
- 19CuranilahueBiobio43.0
- 20ValdiviaLos Ríos Region42.9
+ 27 more cities, 42.1 µg/m³ and below
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.