SmogRank / World / Chile / Santiago Metropolitan / April 2023

Most polluted cities in Santiago Metropolitan, Chile, April 2023

3 cities in Santiago Metropolitan, Chile ranked by their average PM2.5 over the 30 days. Worst: Santiago at 29.8 µg/m³, #51 of 1,567 cities in the world. Cleanest: Puente Alto at 27.3. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 3 of these 30 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.

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.

← Santiago 23% 20%0
Every city in Santiago Metropolitan, Chile ranked for April 2023, 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.
  1. 1Santiago
    23%
  2. 2Talagante
    17%
  3. 3Puente Alto
    8%
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

All cities in the world, April 2023 · All cities in Chile, April 2023 · Santiago Metropolitan now

Use this board

SmogRank, most polluted cities in Santiago Metropolitan, Chile, PM2.5, April 2023, smogrank.com/cl/region/santiago-metropolitan/history/2023-04 (accessed 6 Oct 2026).

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.