SmogRank / World / South America / Chile / Atacama

Most polluted cities in Atacama, Chile

1 measured city, last 7 days; 1 above the WHO 24-hour guideline. Worst: Copiapó at 16.8 µg/m³, #262 in the world.

Antofagasta: 3 measured citiesAtacama: 1 measured cityCoquimbo Region: 2 measured cities#1 Copiapó: 16.8 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
  1. 1Copiapó 2
Low risk1–3
Moderate risk4–6
High risk7–10
Very high risk10+

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. 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

Atacama 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.

City7-day estimateBand
Vallenar≈ 9 µg/m³Low risk
Caldera≈ 9 µg/m³Low risk

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SmogRank, most polluted cities in Atacama, Chile, PM2.5, last 7 days to 2 Oct 2026, 04:00 UTC, smogrank.com/cl/region/atacama?w=7d.

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Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the Canada AQHI+ PM2.5 sub-index.