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 18 Mar 2025: Chiguayante 27.7 µg/m³, Tocopilla 27.2 µg/m³ and Coyhaique 25.8 µg/m³.
- 1ChiguayanteBiobio27.7
- 2TocopillaAntofagasta27.2
- 3CoyhaiqueAysén25.8
- 4ConcónValparaiso25.2
- 5NacimientoBiobio24.7
- 6Puente AltoSantiago Metropolitan23.7
- 7PuchuncavíValparaiso21.6
- 8SantiagoSantiago Metropolitan21.5
- 9AricaArica y Parinacota Region21.3
- 10QuillotaValparaiso20.8
- 11Viña del MarValparaiso20.3
- 12LinaresMaule Region20.2
- 13Puerto VarasLos Lagos Region20.1
- 14AntofagastaAntofagasta20.1
- 15San CarlosÑuble19.9
- 16CopiapóAtacama19.8
- 17QuinteroValparaiso19.5
- 18Puerto AysénAysén19.5
- 19Los ÁngelesBiobio18.9
- 20CalamaAntofagasta18.6
+ 23 more cities, the next at 18.3 µg/m³
Not counted on this day, too few days measured: Coquimbo since 18 Mar 2025.
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.