SmogRank / Chile / Ñuble / Chillán
Chillán, month by month
Chillán has a measured daily mean on 1,279 days since 1 January 2023. Its worst month was May 2024, at 160 US AQI (68.9 µg/m³), 14th of 2,684 cities on that month's world ranking. Its cleanest was January 2023, at 60 US AQI (14.1 µg/m³). 2025 averaged 90 US AQI (30.0 µg/m³), against 94 US AQI (32.1 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
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.
Chillán's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| May 2024 | 16068.9 µg/m³ | 14thof 2,684 | South-western Chile, 24 to 28 May 2024 South-western Chile, 14 to 19 May 2024and 1 more |
| May 2026 | 15561.7 µg/m³ | 28thof 2,874 | Chile, May 2026 Southern Chile, May 2026 |
| July 2024 | 15460.4 µg/m³ | 21stof 2,566 | Southern Chile, July 2024 South-western Chile, July 2024and 2 more |
| June 2023 | 15358.5 µg/m³ | 11thof 1,603 | South-western Chile, June 2023 Southern Chile, June 2023 |
| June 2025 | 15358.3 µg/m³ | 23rdof 2,508 | Southern Chile, 29 June to 4 July 2025 South-western Chile, June 2025and 1 more |
| July 2023 | 14754.1 µg/m³ | 11thof 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.
Chillán's worst days
| Day | US AQI | Episode |
|---|---|---|
| 3 Jul 2025 | 325237.5 µg/m³ | Southern Chile, 29 June to 4 July 2025 |
| 14 Jun 2023 | 282207.0 µg/m³ | Southern Chile, June 2023 |
| 2 Jul 2025 | 247172.0 µg/m³ | Southern Chile, 29 June to 4 July 2025 |
| 25 Jun 2026 | 219144.0 µg/m³ | – |
| 24 Aug 2026 | 211136.0 µg/m³ | Southern Chile, August 2026 |
| 20 May 2026 | 211135.1 µg/m³ | Southern Chile, May 2026 |
| 19 May 2024 | 210134.4 µg/m³ | South-western Chile, 14 to 19 May 2024 |
| 19 May 2026 | 210134.1 µg/m³ | Southern Chile, May 2026 |
| 10 Jun 2025 | 208132.3 µg/m³ | South-western Chile, June 2025 |
| 19 Jun 2023 | 207131.5 µg/m³ | South-western Chile, June 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, Chillán, Chile, 1 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/chillan/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.
Chillán 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).