SmogRank / Chile / Antofagasta / Calama
Calama, month by month
Calama has a measured daily mean on 1,298 days since 1 January 2023. Its worst month was February 2025, at 72 US AQI (20.6 µg/m³), 515th of 2,633 cities on that month's world ranking. Its cleanest was September 2026, at 62 US AQI (14.9 µg/m³). 2025 averaged 67 US AQI (17.8 µg/m³), against 67 US AQI (17.7 µg/m³) in 2024.
Every month since 2023
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
Months without a mean, and why
2 months
| Month | Why |
|---|---|
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Calama's worst months
| Month | US AQI | World rank |
|---|---|---|
| February 2025 | 7220.6 µg/m³ | 515thof 2,633 |
| January 2025 | 7220.2 µg/m³ | 294thof 2,474 |
| December 2024 | 7019.1 µg/m³ | 291stof 2,616 |
| June 2023 | 6918.9 µg/m³ | 290thof 1,603 |
| January 2023 | 6918.7 µg/m³ | 167thof 1,261 |
| January 2026 | 6818.4 µg/m³ | 539thof 2,617 |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Calama's worst days
| Day | US AQI |
|---|---|
| 1 Jan 2024 | 9633.5 µg/m³ |
| 23 Jan 2026 | 9231.0 µg/m³ |
| 5 Jan 2025 | 8628.0 µg/m³ |
| 30 Mar 2025 | 8627.8 µg/m³ |
| 4 Jan 2025 | 8527.2 µg/m³ |
| 1 Feb 2025 | 8527.2 µg/m³ |
| 28 Jan 2025 | 8326.2 µg/m³ |
| 26 Jan 2026 | 8225.9 µg/m³ |
| 1 Jan 2025 | 8225.8 µg/m³ |
| 3 Feb 2025 | 8125.3 µg/m³ |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Calama, Chile, 1 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/calama/history (accessed 12 Oct 2026).
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.
Calama now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).