SmogRank / World / South America / Chile / Atacama
Most polluted cities in Atacama, Chile
1 measured city, last 30 days; 1 above the WHO 24-hour guideline. Worst: Copiapó at 18.8 µg/m³, #398 in the world.
- 1Copiapó 2
The UK's Daily Air Quality Index (1 to 10), PM2.5 bands. 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.
| City | 7-day estimate |
|---|---|
| Vallenar | ≈ 9 µg/m³ |
| Caldera | ≈ 9 µg/m³ |
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SmogRank, most polluted cities in Atacama, Chile, PM2.5, last 30 days to 2 Oct 2026, 06:00 UTC, smogrank.com/cl/region/atacama?w=30d.
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Updated 2026-10-02 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the UK DAQI PM2.5 sub-index.