SmogRank / World / South America / Chile / Antofagasta

Most polluted cities in Antofagasta, Chile

3 measured cities, last 30 days; 2 above the WHO 24-hour guideline. Worst: Antofagasta at 20.1 µg/m³, #245 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.

Tarapacá: 1 measured cityAntofagasta: 3 measured citiesAtacama: 2 measured cities#3 Calama: 15.0 µg/m³#2 Tocopilla: 18.0 µg/m³#1 Antofagasta: 20.1 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Tocopilla 4% 3%0
Every measured city in Antofagasta, 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.
  1. 1Tocopilla 4%
  2. 2Antofagasta 0%
  3. 3Calama 0%
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, last 30 days to 6 Oct 2026, 22:00 UTC, smogrank.com/cl/region/antofagasta?w=30d.

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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.