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 28 Jan 2023: Tocopilla 28.3 µg/m³, Nacimiento 24.4 µg/m³ and Santiago 23.8 µg/m³.
- 1TocopillaAntofagasta28.3
- 2NacimientoBiobio24.4
- 3SantiagoSantiago Metropolitan23.8
- 4RancaguaO'Higgins Region23.3
- 5PuchuncavíValparaiso22.8
- 6AricaArica y Parinacota Region22.7
- 7Puente AltoSantiago Metropolitan22.6
- 8LajaBiobio22.2
- 9TalaganteSantiago Metropolitan22.0
- 10HualpénBiobio21.4
- 11QuinteroValparaiso20.9
- 12ConcónValparaiso20.8
- 13Viña del MarValparaiso20.7
- 14QuillotaValparaiso19.9
- 15RengoO'Higgins Region19.7
- 16CuricóMaule Region19.5
- 17La SerenaCoquimbo Region19.2
- 18HuascoAtacama19.1
- 19CalamaAntofagasta18.8
- 20TalcahuanoBiobio18.7
+ 19 more cities, the next at 18.3 µg/m³
Days missing from the source archive fall in this window, so fewer countries are counted.
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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.