SmogRank / Chile / Antofagasta / Antofagasta
Antofagasta, month by month
Antofagasta has a measured daily mean on 1,201 days since 1 January 2023. Its worst month was June 2023, at 83 US AQI (26.3 µg/m³), 155th of 1,603 cities on that month's world ranking. Its cleanest was February 2024, at 63 US AQI (15.6 µg/m³). 2025 averaged 73 US AQI (21.1 µg/m³), against 73 US AQI (21.0 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
5 months
| Month | Why |
|---|---|
| Oct 2026 | 7 of 11 days measured; a month needs 8. The others: 1 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Jul 2025 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| 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.
Antofagasta's worst months
| Month | US AQI | World rank |
|---|---|---|
| June 2023 | 8326.3 µg/m³ | 155thof 1,603 |
| June 2025 | 8225.9 µg/m³ | 159thof 2,508 |
| July 2024 | 8225.6 µg/m³ | 73rdof 2,566 |
| May 2023 | 8225.5 µg/m³ | 73rdof 1,600 |
| June 2026 | 8125.2 µg/m³ | 191stof 2,497 |
| June 2024 | 8125.1 µg/m³ | 61stof 2,563 |
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.
Antofagasta's worst days
| Day | US AQI |
|---|---|
| 22 May 2025 | 11039.2 µg/m³ |
| 2 Jul 2025 | 10436.9 µg/m³ |
| 12 May 2023 | 10135.5 µg/m³ |
| 26 Jun 2026 | 10135.5 µg/m³ |
| 11 May 2023 | 9934.9 µg/m³ |
| 4 Jun 2025 | 9834.2 µg/m³ |
| 21 May 2024 | 9733.9 µg/m³ |
| 5 Jun 2024 | 9733.7 µg/m³ |
| 17 Jun 2023 | 9633.5 µg/m³ |
| 27 Jun 2026 | 9633.5 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, Antofagasta, Chile, 1 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/antofagasta/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.
Antofagasta now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).