SmogRank / United States / California / Truckee
Truckee, month by month
Truckee has a measured daily mean on 1,188 days since 1 January 2023. Its worst month was January 2023, at 47 US AQI (8.5 µg/m³), 637th of 1,261 cities on that month's world ranking. Its cleanest was March 2025, at 13 US AQI (2.3 µg/m³). 2025 averaged 24 US AQI (4.4 µg/m³), against 27 US AQI (4.8 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 |
|---|---|
| Aug 2024 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 20 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 10 with under 18 hours of readings or readings that failed our checks. |
| Dec 2023 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 8 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 3 with under 18 hours of readings or readings that failed our checks. |
| Feb 2023 | 1 of 28 days measured; a month needs 20. The others: 25 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.
Truckee's worst months
| Month | US AQI | World rank |
|---|---|---|
| January 2023 | 478.5 µg/m³ | 637thof 1,261 |
| August 2026 | 468.3 µg/m³ | 1,481stof 2,896 |
| July 2023 | 417.4 µg/m³ | 930thof 1,432 |
| October 2023 | 397.1 µg/m³ | 1,066thof 2,012 |
| November 2023 | 397.0 µg/m³ | 1,448thof 2,243 |
| July 2024 | 376.7 µg/m³ | 1,791stof 2,566 |
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.
Truckee's worst days
| Day | US AQI |
|---|---|
| 8 Nov 2024 | 13247.9 µg/m³ |
| 9 Nov 2024 | 8627.8 µg/m³ |
| 9 Oct 2025 | 7119.7 µg/m³ |
| 8 Nov 2023 | 7019.3 µg/m³ |
| 5 Aug 2026 | 7019.3 µg/m³ |
| 24 Sept 2023 | 6918.7 µg/m³ |
| 8 Jan 2024 | 6918.7 µg/m³ |
| 31 Aug 2026 | 6818.0 µg/m³ |
| 9 Nov 2023 | 6516.8 µg/m³ |
| 12 Aug 2026 | 6416.0 µg/m³ |
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, Truckee, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/truckee/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.
Truckee now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).