SmogRank / Chile / Biobio / Los Ángeles
Los Ángeles, month by month
Los Ángeles, Biobio has a measured daily mean on 1,288 days since 1 January 2023. Its worst month was June 2025, at 156 US AQI (63.2 µg/m³), 16th of 2,508 cities on that month's world ranking. Its cleanest was December 2025, at 60 US AQI (13.9 µg/m³). 2025 averaged 90 US AQI (30.2 µg/m³), against 88 US AQI (29.0 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
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.
Los Ángeles's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2025 | 15663.2 µg/m³ | 16thof 2,508 | Southern Chile, 29 June to 4 July 2025 South-western Chile, June 2025and 1 more |
| May 2024 | 15561.9 µg/m³ | 19thof 2,684 | South-western Chile, 24 to 28 May 2024 South-western Chile, 14 to 19 May 2024and 1 more |
| May 2026 | 14352.4 µg/m³ | 53rdof 2,874 | Chile, May 2026 Southern Chile, May 2026and 1 more |
| July 2025 | 14151.8 µg/m³ | 31stof 2,889 | Southern Chile, 29 June to 4 July 2025 |
| July 2024 | 14151.6 µg/m³ | 28thof 2,566 | Southern Chile, July 2024 South-western Chile, July 2024and 2 more |
| July 2023 | 13951.0 µg/m³ | 17thof 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.
Los Ángeles's worst days
| Day | US AQI | Episode |
|---|---|---|
| 3 Jul 2025 | 291216.0 µg/m³ | Southern Chile, 29 June to 4 July 2025 |
| 10 Jun 2025 | 276201.5 µg/m³ | South-western Chile, June 2025 |
| 6 Jul 2026 | 269194.0 µg/m³ | Southern Chile, July 2026 |
| 3 Jul 2026 | 241165.8 µg/m³ | Southern Chile, July 2026 |
| 2 Jul 2025 | 233157.5 µg/m³ | Southern Chile, 29 June to 4 July 2025 |
| 30 Jun 2024 | 230155.0 µg/m³ | Southern Chile, 30 June to 1 July 2024 |
| 26 May 2024 | 223147.6 µg/m³ | South-western Chile, 24 to 28 May 2024 |
| 23 Jul 2024 | 214138.8 µg/m³ | South-western Chile, July 2024 |
| 28 May 2024 | 205129.9 µg/m³ | South-western Chile, 24 to 28 May 2024 |
| 11 Jun 2025 | 204128.9 µg/m³ | South-western Chile, June 2025 |
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, Los Ángeles, Biobio, Chile, 1 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/los-angeles/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.
Los Ángeles now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 01:07 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).