SmogRank / Cleaner or dirtier / Chile

Chile: cleaner or dirtier, 2026

In Chile, 47 cities have enough days in both years to compare 2026 so far (1 January to 6 October) with the same days of 2025: 16 got dirtier and 30 cleaner.

Every city's change from 2025 to 2026, one column each, biggest rise on the left, coloured by its 2026 level. Above the line: dirtier. Below: cleaner.

The 16 cities that got dirtier, biggest rise first

#City20252026Change
1CoyhaiqueAysén, Chile153159+9.0 µg/m³+16%
2LotaBiobio, Chile6574+5.1 µg/m³+31%
3La UniónLos Ríos Region, Chile104114+4.2 µg/m³+11%
4CuranilahueBiobio, Chile105114+3.6 µg/m³+10%
5Puerto VarasLos Lagos Region, Chile124131+2.8 µg/m³+6%
6ValdiviaLos Ríos Region, Chile102109+2.8 µg/m³+8%
7OsornoLos Lagos Region, Chile129135+2.5 µg/m³+5%
8ChillánÑuble, Chile98103+2.0 µg/m³+6%
9CauquenesMaule Region, Chile8790+1.8 µg/m³+6%
10HualpénBiobio, Chile130133+1.3 µg/m³+3%
11San Pedro de la PazBiobio, Chile7880+1.2 µg/m³+5%
12AricaArica y Parinacota Region, Chile7476+1.1 µg/m³+5%
13LajaBiobio, Chile129131+0.7 µg/m³+1%
14Puerto MonttLos Lagos Region, Chile9798+0.5 µg/m³+1%
15ToméBiobio, Chile8080+0.1 µg/m³0%
16Viña del MarValparaiso, Chile7676+0.1 µg/m³0%

The 30 cities that got cleaner, biggest fall first

#City20252026Change
1NacimientoBiobio, Chile148121−10.6 µg/m³−19%
2VillarricaAraucania, Chile118102−6.8 µg/m³−16%
3San CarlosÑuble, Chile112100−4.7 µg/m³−12%
4ChiguayanteBiobio, Chile8678−4.4 µg/m³−16%
5LinaresMaule Region, Chile129118−4.2 µg/m³−9%
6QuillotaValparaiso, Chile8275−3.9 µg/m³−15%
7ConcónValparaiso, Chile8579−3.5 µg/m³−13%
8Puente AltoSantiago Metropolitan, Chile9892−3.2 µg/m³−9%
9TalaganteSantiago Metropolitan, Chile10396−3.0 µg/m³−8%
10PuchuncavíValparaiso, Chile8479−2.9 µg/m³−11%
11Los ÁngelesBiobio, Chile9893−2.7 µg/m³−8%
12CoronelBiobio, Chile9590−2.6 µg/m³−8%
13CalamaAntofagasta, Chile6864−2.0 µg/m³−11%
14HualquiBiobio, Chile9894−1.8 µg/m³−5%
15CoquimboCoquimbo Region, Chile7369−1.7 µg/m³−8%
16TemucoAraucania, Chile104100−1.7 µg/m³−5%
17QuilpuéValparaiso, Chile8683−1.6 µg/m³−6%
18SantiagoSantiago Metropolitan, Chile10097−1.6 µg/m³−5%
19Alto HospicioTarapacá, Chile6663−1.5 µg/m³−9%
20TocopillaAntofagasta, Chile8078−1.2 µg/m³−5%
21RengoO'Higgins Region, Chile9997−1.1 µg/m³−3%
22HuascoAtacama, Chile6967−0.9 µg/m³−5%
23AntofagastaChile7573−0.8 µg/m³−4%
24RancaguaO'Higgins Region, Chile9796−0.8 µg/m³−2%
25ConcepciónBiobio, Chile8079−0.7 µg/m³−3%
26QuinteroValparaiso, Chile8079−0.7 µg/m³−3%
27Puerto AysénAysén, Chile9897−0.7 µg/m³−2%
28TalcaMaule Region, Chile9493−0.6 µg/m³−2%
29CuricóMaule Region, Chile112111−0.4 µg/m³−1%
30La SerenaCoquimbo Region, Chile7474−0.2 µg/m³−1%

Means in US AQI over the days a city was measured in both years, the same calendar days each year; a city needs 55% of the days paired, and at least 30. The change is in µg/m³ and per cent. How we compare.

Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Updated 2026-10-07 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.