SmogRank / Chile / Coquimbo Region / Coquimbo
Coquimbo, month by month
Coquimbo has a measured daily mean on 1,138 days since 3 January 2023. Its worst month was June 2025, at 92 US AQI (31.0 µg/m³), 116th of 2,508 cities on that month's world ranking. Its cleanest was October 2024, at 65 US AQI (16.7 µg/m³). 2025 averaged 74 US AQI (21.5 µg/m³), against 71 US AQI (19.6 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 |
|---|---|
| Jun 2026 | 1 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | 4 of 31 days measured; a month needs 22. The others: 27 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. |
| Jan 2023 | 21 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 2 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Coquimbo's worst months
| Month | US AQI | World rank |
|---|---|---|
| June 2025 | 9231.0 µg/m³ | 116thof 2,508 |
| July 2023 | 8728.3 µg/m³ | 45thof 1,432 |
| May 2023 | 8628.1 µg/m³ | 66thof 1,600 |
| June 2023 | 8527.6 µg/m³ | 127thof 1,603 |
| May 2025 | 8426.6 µg/m³ | 178thof 2,826 |
| July 2025 | 8326.2 µg/m³ | 125thof 2,889 |
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.
Coquimbo's worst days
| Day | US AQI |
|---|---|
| 17 Jun 2023 | 13047.3 µg/m³ |
| 9 Jun 2025 | 12445.0 µg/m³ |
| 21 Jun 2025 | 12445.0 µg/m³ |
| 10 May 2023 | 12043.4 µg/m³ |
| 9 May 2023 | 11842.5 µg/m³ |
| 16 Jul 2023 | 11842.4 µg/m³ |
| 10 Jun 2025 | 11842.4 µg/m³ |
| 19 Jul 2023 | 11641.5 µg/m³ |
| 20 Jun 2025 | 11440.6 µg/m³ |
| 2 Jul 2025 | 11340.4 µg/m³ |
Daily means, the highest since 3 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, Coquimbo, Chile, 3 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/coquimbo/history (accessed 13 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.
Coquimbo now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 00:07 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).