SmogRank / Chile / Los Lagos Region / Osorno
Osorno, month by month
Osorno has a measured daily mean on 1,258 days since 1 January 2023. Its worst month was May 2024, at 185 US AQI (104.1 µg/m³), 4th of 2,684 cities on that month's world ranking. Its cleanest was January 2023, at 59 US AQI (13.6 µg/m³). 2025 averaged 113 US AQI (40.3 µg/m³), against 124 US AQI (44.9 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
4 months
| Month | Why |
|---|---|
| Jan 2024 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Oct 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. |
| Mar 2023 | 5 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 6 with under 18 hours of readings or readings that failed our checks. |
| 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.
Osorno's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| May 2024 | 185104.1 µg/m³ | 4thof 2,684 | South-western Chile, 24 to 28 May 2024 South-western Chile, 14 to 19 May 2024 |
| July 2026 | 18096.8 µg/m³ | 2ndof 2,784 | Southern Chile, July 2026 |
| July 2024 | 17284.8 µg/m³ | 3rdof 2,566 | Southern Chile, July 2024 South-western Chile, July 2024and 1 more |
| July 2025 | 17184.2 µg/m³ | 2ndof 2,889 | Southern Chile, 29 June to 4 July 2025 |
| June 2025 | 17082.4 µg/m³ | 3rdof 2,508 | Southern Chile, 29 June to 4 July 2025 South-western Chile, June 2025 |
| July 2023 | 16575.0 µg/m³ | 3rdof 1,432 | Southern Chile, July 2023 |
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.
Osorno's worst days
| Day | US AQI | Episode |
|---|---|---|
| 5 Jul 2026 | 500+347.0 µg/m³ | Southern Chile, July 2026 |
| 27 May 2024 | 476313.5 µg/m³ | South-western Chile, 24 to 28 May 2024 |
| 18 Jul 2023 | 439295.0 µg/m³ | Southern Chile, July 2023 |
| 2 Jul 2025 | 430290.5 µg/m³ | Southern Chile, 29 June to 4 July 2025 |
| 16 May 2024 | 400275.0 µg/m³ | South-western Chile, 14 to 19 May 2024 |
| 4 Jul 2026 | 400275.0 µg/m³ | Southern Chile, July 2026 |
| 6 Jul 2026 | 345247.5 µg/m³ | Southern Chile, July 2026 |
| 3 Jul 2026 | 314232.0 µg/m³ | Southern Chile, July 2026 |
| 1 Jul 2025 | 293218.5 µg/m³ | Southern Chile, 29 June to 4 July 2025 |
| 26 Aug 2023 | 292217.0 µg/m³ | South-western Chile, 26 to 27 August 2023 |
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, Osorno, Chile, 1 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/osorno/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.
Osorno now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 21:07 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).