SmogRank / Cleaner or dirtier / Chile

Chile: cleaner or dirtier, 2025

In Chile, 45 cities have enough days in both years to compare 2025 with the same days of 2024: 15 got dirtier and 28 cleaner.

The 15 cities that got dirtier, biggest rise first

#	City	2024	2025	Change
1	ConcónValparaiso, Chile	75	83	+4.3 µg/m³+20%
2	CopiapóAtacama, Chile	70	75	+2.8 µg/m³+15%
3	AricaArica y Parinacota Region, Chile	72	76	+2.2 µg/m³+11%
4	Puente AltoSantiago Metropolitan, Chile	89	93	+2.0 µg/m³+7%
5	CoquimboCoquimbo Region, Chile	71	74	+1.8 µg/m³+9%
6	NacimientoBiobio, Chile	128	132	+1.6 µg/m³+3%
7	TalaganteSantiago Metropolitan, Chile	90	93	+1.5 µg/m³+5%
8	TalcaMaule Region, Chile	84	87	+1.5 µg/m³+6%
9	La SerenaCoquimbo Region, Chile	70	73	+1.5 µg/m³+8%
10	Los ÁngelesBiobio, Chile	89	91	+1.3 µg/m³+4%
11	TocopillaAntofagasta, Chile	77	78	+0.7 µg/m³+3%
12	Alto HospicioTarapacá, Chile	65	66	+0.7 µg/m³+4%
13	CuricóMaule Region, Chile	97	98	+0.6 µg/m³+2%
14	HuascoAtacama, Chile	67	68	+0.5 µg/m³+3%
15	PuchuncavíValparaiso, Chile	81	81	+0.1 µg/m³0%

The 28 cities that got cleaner, biggest fall first

#	City	2024	2025	Change
1	HualpénBiobio, Chile	134	116	−7.0 µg/m³−14%
2	La UniónLos Ríos Region, Chile	106	93	−5.9 µg/m³−16%
3	Puerto MonttLos Lagos Region, Chile	99	90	−5.0 µg/m³−14%
4	TalcahuanoBiobio, Chile	91	84	−3.7 µg/m³−12%
5	OsornoLos Lagos Region, Chile	126	117	−3.7 µg/m³−8%
6	HualquiBiobio, Chile	96	89	−3.7 µg/m³−11%
7	CoyhaiqueAysén, Chile	144	135	−3.7 µg/m³−7%
8	CuranilahueBiobio, Chile	105	96	−3.6 µg/m³−10%
9	ToméBiobio, Chile	83	77	−3.3 µg/m³−13%
10	Puerto AysénAysén, Chile	96	90	−3.3 µg/m³−10%
11	QuillotaValparaiso, Chile	85	79	−3.2 µg/m³−12%
12	CauquenesMaule Region, Chile	87	81	−3.2 µg/m³−11%
13	CoronelBiobio, Chile	94	89	−2.9 µg/m³−9%
14	ChillánÑuble, Chile	96	91	−2.7 µg/m³−8%
15	TemucoAraucania, Chile	98	93	−2.5 µg/m³−7%
16	RengoO'Higgins Region, Chile	95	91	−2.2 µg/m³−7%
17	RancaguaO'Higgins Region, Chile	96	92	−2.2 µg/m³−7%
18	ChiguayanteBiobio, Chile	85	81	−2.0 µg/m³−7%
19	Puerto VarasLos Lagos Region, Chile	116	111	−1.9 µg/m³−5%
20	QuinteroValparaiso, Chile	80	78	−1.3 µg/m³−5%
21	Viña del MarValparaiso, Chile	76	73	−1.2 µg/m³−5%
22	ConcepciónBiobio, Chile	78	76	−1.1 µg/m³−5%
23	San Pedro de la PazBiobio, Chile	77	75	−0.9 µg/m³−4%
24	ValdiviaLos Ríos Region, Chile	93	92	−0.8 µg/m³−3%
25	San CarlosÑuble, Chile	100	99	−0.7 µg/m³−2%
26	SantiagoSantiago Metropolitan, Chile	95	94	−0.3 µg/m³−1%
27	VillarricaAraucania, Chile	123	123	−0.2 µg/m³0%
28	AntofagastaChile	73	73	−0.1 µg/m³0%

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.

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.