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.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.

← Puente Alto 17% 10%0

Every measured city in Santiago Metropolitan, Chile, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.

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

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	Band
Maipú	≈ 37 µg/m³	Unhealthy for sensitive groups
San Bernardo	≈ 37 µg/m³	Unhealthy for sensitive groups
Peñalolén	≈ 18 µg/m³	Moderate
Quilicura	≈ 30 µg/m³	Moderate
La Pintana	≈ 37 µg/m³	Unhealthy for sensitive groups
Renca	≈ 37 µg/m³	Unhealthy for sensitive groups
Colina	≈ 30 µg/m³	Moderate
Lo Prado	≈ 37 µg/m³	Unhealthy for sensitive groups
Lampa	≈ 30 µg/m³	Moderate
Peñaflor	≈ 37 µg/m³	Unhealthy for sensitive groups
Paine	≈ 22 µg/m³	Moderate
Buin	≈ 37 µg/m³	Unhealthy for sensitive groups
Padre Hurtado	≈ 37 µg/m³	Unhealthy for sensitive groups
Melipilla	≈ 24 µg/m³	Moderate
El Monte	≈ 37 µg/m³	Unhealthy for sensitive groups
Curacaví	≈ 17 µg/m³	Moderate

Bad-air episodes in Santiago Metropolitan

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

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.

Download top 10 (PNG)

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.