SmogRank / Chile / Biobio / Tomé
Tomé, month by month
Tomé has a measured daily mean on 1,173 days since 1 January 2023. Its worst month was July 2024, at 118 US AQI (42.5 µg/m³), 39th of 2,566 cities on that month's world ranking. Its cleanest was October 2025, at 62 US AQI (15.0 µg/m³). 2025 averaged 76 US AQI (22.4 µg/m³), against 82 US AQI (25.6 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 |
|---|---|
| Oct 2026 | 7 of 11 days measured; a month needs 8. The others: 3 with readings for part of the day (a day needs 18 hours), 1 with readings left out by our checks. |
| Dec 2025 | 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 2025 | 20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 7 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 4 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.
Tomé's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2024 | 11842.5 µg/m³ | 39thof 2,566 | South-western Chile, July 2024 |
| May 2024 | 11139.5 µg/m³ | 44thof 2,684 | South-western Chile, 24 to 28 May 2024 |
| June 2025 | 10235.8 µg/m³ | 94thof 2,508 | – |
| May 2023 | 10135.6 µg/m³ | 42ndof 1,600 | – |
| July 2023 | 9834.3 µg/m³ | 35thof 1,432 | – |
| May 2026 | 9834.1 µg/m³ | 138thof 2,874 | – |
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.
Tomé's worst days
| Day | US AQI | Episode |
|---|---|---|
| 23 Aug 2026 | 16777.9 µg/m³ | Southern Chile, August 2026 |
| 28 May 2024 | 16677.4 µg/m³ | South-western Chile, 24 to 28 May 2024 |
| 22 Jul 2024 | 16068.9 µg/m³ | South-western Chile, July 2024 |
| 23 Jul 2024 | 16068.0 µg/m³ | South-western Chile, July 2024 |
| 29 May 2023 | 15865.8 µg/m³ | – |
| 30 May 2023 | 15864.8 µg/m³ | – |
| 14 Jun 2023 | 15764.5 µg/m³ | Southern Chile, June 2023 |
| 22 Aug 2026 | 15763.7 µg/m³ | Southern Chile, August 2026 |
| 20 Jul 2024 | 15663.0 µg/m³ | South-western Chile, July 2024 |
| 24 May 2024 | 15561.5 µg/m³ | South-western Chile, 24 to 28 May 2024 |
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, Tomé, Chile, 1 Jan 2023 – 10 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/tome/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.
Tomé now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 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).