SmogRank / World / South America / Chile / Antofagasta

Most polluted cities in Antofagasta, Chile

3 measured cities, this year; 3 above the WHO annual guideline. Worst: Tocopilla at 23.4 µg/m³, #287 in the world.

About 1.81K people in this city breathed unhealthy air on an average day so far this year.

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.

Tarapacá: 1 measured cityAntofagasta: 3 measured citiesAtacama: 1 measured city#3 Calama: 16.1 µg/m³#2 Antofagasta: 21.1 µg/m³#1 Tocopilla: 23.4 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
  1. 1Tocopilla 1.81K
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

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SmogRank, most polluted cities in Antofagasta, Chile, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/cl/region/antofagasta?w=year.

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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 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.