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 Feb 2025: Nacimiento 36.1 µg/m³, Chiguayante 32.0 µg/m³ and Puente Alto 23.6 µg/m³.
- 1NacimientoBiobio36.1
- 2ChiguayanteBiobio32.0
- 3Puente AltoSantiago Metropolitan23.6
- 4PuchuncavíValparaiso23.5
- 5QuillotaValparaiso22.7
- 6SantiagoSantiago Metropolitan22.4
- 7TocopillaAntofagasta22.2
- 8San CarlosÑuble21.8
- 9HualquiBiobio21.3
- 10Viña del MarValparaiso21.2
- 11LinaresMaule Region21.1
- 12AricaArica y Parinacota Region21.0
- 13TalaganteSantiago Metropolitan20.5
- 14QuinteroValparaiso20.4
- 15CalamaAntofagasta20.4
- 16ConcónValparaiso20.2
- 17Los ÁngelesBiobio20.1
- 18CuricóMaule Region20.1
- 19RengoO'Higgins Region20.0
- 20RancaguaO'Higgins Region19.9
+ 26 more cities, 19.9 µg/m³ and below
Not counted on this day, too few days measured: Hualpén since 26 Dec 2024.
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.