SmogRank / United States / Oregon / Cottage Grove
Cottage Grove, month by month
Cottage Grove has a measured daily mean on 1,307 days since 1 January 2023. Its worst month was August 2023, at 63 US AQI (15.5 µg/m³), 185th of 1,980 cities on that month's world ranking. Its cleanest was June 2023, at 9 US AQI (1.7 µg/m³). 2025 averaged 39 US AQI (7.0 µg/m³), against 36 US AQI (6.4 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.
Cottage Grove's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2023 | 6315.5 µg/m³ | 185thof 1,980 | North-western United States and Canada, August 2023 |
| January 2026 | 5913.3 µg/m³ | 852ndof 2,617 | – |
| November 2023 | 5712.5 µg/m³ | 261stof 2,243 | – |
| August 2026 | 5712.5 µg/m³ | 516thof 2,896 | North-western United States and Canada, 4 to 22 August 2026 |
| January 2025 | 5712.4 µg/m³ | 684thof 2,474 | Western United States and Mexico, January and February 2025 |
| November 2025 | 5511.4 µg/m³ | 824thof 2,715 | – |
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.
Cottage Grove's worst days
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, Cottage Grove, 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/cottage-grove-oregon/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.
Cottage Grove 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).