SmogRank / United States / California / North Auburn
North Auburn, month by month
North Auburn has a measured daily mean on 1,262 days since 1 January 2023. Its worst month was January 2025, at 49 US AQI (8.8 µg/m³), 1,220th of 2,474 cities on that month's world ranking. Its cleanest was May 2023, at 15 US AQI (2.7 µg/m³). 2025 averaged 37 US AQI (6.7 µg/m³), against 31 US AQI (5.5 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 | 1 of 28 days measured; a month needs 20. The others: 2 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
North Auburn's worst months
| Month | US AQI | World rank |
|---|---|---|
| January 2025 | 498.8 µg/m³ | 1,220thof 2,474 |
| January 2026 | 498.8 µg/m³ | 1,289thof 2,617 |
| December 2023 | 488.7 µg/m³ | 1,044thof 2,247 |
| December 2025 | 488.6 µg/m³ | 1,668thof 3,006 |
| November 2023 | 478.5 µg/m³ | 997thof 2,243 |
| June 2025 | 478.4 µg/m³ | 1,740thof 2,508 |
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.
North Auburn's worst days
| Day | US AQI |
|---|---|
| 27 Mar 2023 | 10838.3 µg/m³ |
| 12 Nov 2023 | 8326.5 µg/m³ |
| 23 Jan 2026 | 7723.0 µg/m³ |
| 12 Jul 2025 | 7119.8 µg/m³ |
| 30 Jan 2025 | 7019.5 µg/m³ |
| 28 Jan 2023 | 7019.2 µg/m³ |
| 21 Sept 2023 | 6919.0 µg/m³ |
| 23 Sept 2023 | 6918.7 µg/m³ |
| 20 Oct 2023 | 6818.3 µg/m³ |
| 11 Nov 2023 | 6717.5 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, North Auburn, 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/north-auburn/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.
North Auburn now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 04:07 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).