SmogRank / World / South America / Chile / Santiago Metropolitan
Most polluted cities in Santiago Metropolitan, Chile
3 measured cities, last 30 days; 3 above the WHO 24-hour guideline. Worst: Puente Alto at 26.8 µg/m³, #142 in the world.
About 645K people in this city breathed unhealthy air on an average day over the last 30 days.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
- 1Santiago 645K
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
Estimated: cities without a monitor
Santiago Metropolitan cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Maipú | ≈ 37 µg/m³ |
| San Bernardo | ≈ 37 µg/m³ |
| Peñalolén | ≈ 18 µg/m³ |
| Quilicura | ≈ 30 µg/m³ |
| La Pintana | ≈ 37 µg/m³ |
| Renca | ≈ 37 µg/m³ |
| Colina | ≈ 30 µg/m³ |
| Lo Prado | ≈ 37 µg/m³ |
| Lampa | ≈ 30 µg/m³ |
| Peñaflor | ≈ 37 µg/m³ |
| Paine | ≈ 22 µg/m³ |
| Buin | ≈ 37 µg/m³ |
| Padre Hurtado | ≈ 37 µg/m³ |
| Melipilla | ≈ 24 µg/m³ |
| El Monte | ≈ 37 µg/m³ |
| Curacaví | ≈ 17 µg/m³ |
Bad-air episodes in Santiago Metropolitan
- Chile, May 202625 to 27 May 2026, 3 days14 cities165 µg/m³peak, Linares
- Chile, July 202411 to 14 July 2024, 4 days24 cities255 µg/m³peak, Cauquenes
- Southern Chile, 30 June to 1 July 20242 days8 cities195 µg/m³peak, San Carlos
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
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SmogRank, most polluted cities in Santiago Metropolitan, Chile, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/cl/region/santiago-metropolitan?w=30d.
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.