SmogRank / Chile / Atacama / Copiapó
Copiapó, month by month
Copiapó has a measured daily mean on 1,057 days since 1 January 2023. Its worst month was February 2026, at 85 US AQI (27.4 µg/m³), 298th of 2,866 cities on that month's world ranking. Its cleanest was February 2024, at 66 US AQI (16.9 µg/m³). 2025 averaged 75 US AQI (22.0 µg/m³), against 70 US AQI (19.1 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
9 months
| Month | Why |
|---|---|
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | 19 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Dec 2023 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | 1 of 30 days measured; a month needs 21. The others: 29 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.
Copiapó's worst months
| Month | US AQI | World rank |
|---|---|---|
| February 2026 | 8527.4 µg/m³ | 298thof 2,866 |
| June 2025 | 8426.8 µg/m³ | 145thof 2,508 |
| July 2025 | 8024.4 µg/m³ | 141stof 2,889 |
| June 2023 | 7924.3 µg/m³ | 187thof 1,603 |
| January 2026 | 7924.1 µg/m³ | 268thof 2,617 |
| March 2026 | 7924.0 µg/m³ | 462ndof 2,971 |
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.
Copiapó's worst days
| Day | US AQI |
|---|---|
| 27 Feb 2026 | 12444.8 µg/m³ |
| 8 Jun 2025 | 12143.8 µg/m³ |
| 28 Feb 2026 | 11541.2 µg/m³ |
| 9 Jun 2025 | 11139.4 µg/m³ |
| 16 Jul 2025 | 10336.3 µg/m³ |
| 22 Jun 2025 | 10035.3 µg/m³ |
| 30 Jun 2024 | 9834.3 µg/m³ |
| 20 Jun 2025 | 9734.0 µg/m³ |
| 15 Jun 2025 | 9733.9 µg/m³ |
| 28 Sept 2025 | 9633.3 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, Copiapó, Chile, 1 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/copiapo/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.
Copiapó now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 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).