SmogRank / United States / Oregon / Sweet Home
Sweet Home, month by month
Sweet Home has a measured daily mean on 1,203 days since 1 January 2023. Its worst month was August 2023, at 57 US AQI (12.1 µg/m³), 329th of 1,980 cities on that month's world ranking. Its cleanest was September 2026, at 6 US AQI (1.1 µg/m³). 2025 averaged 33 US AQI (5.9 µg/m³), against 28 US AQI (5.0 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
7 months
| Month | Why |
|---|---|
| Mar 2026 | 19 of 31 days measured; a month needs 22. The others: 11 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours). |
| Feb 2026 | No day measured. The others: 28 with no readings from the monitor. |
| Jan 2026 | No day measured. The others: 31 with no readings from the monitor. |
| Dec 2025 | 16 of 31 days measured; a month needs 22. The others: 14 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours). |
| 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. |
| Jan 2023 | 21 of 31 days measured; a month needs 22. The others: 4 with readings for part of the day (a day needs 18 hours), 6 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Sweet Home's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2023 | 5712.1 µg/m³ | 329thof 1,980 | North-western United States and Canada, August 2023 |
| January 2025 | 5310.3 µg/m³ | 940thof 2,474 | – |
| November 2023 | 5310.1 µg/m³ | 600thof 2,243 | – |
| August 2026 | 5310.1 µg/m³ | 873rdof 2,896 | North-western United States and Canada, 4 to 22 August 2026 |
| November 2025 | 519.2 µg/m³ | 1,202ndof 2,715 | – |
| October 2025 | 478.4 µg/m³ | 781stof 2,614 | – |
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.
Sweet Home's worst days
| Day | US AQI | Episode |
|---|---|---|
| 5 Aug 2026 | 17387.4 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 6 Aug 2026 | 16169.6 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 31 Oct 2025 | 13248.2 µg/m³ | – |
| 4 Aug 2026 | 12846.3 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 20 Aug 2023 | 11742.0 µg/m³ | North-western United States and Canada, August 2023 |
| 15 Aug 2023 | 10637.4 µg/m³ | North-western United States and Canada, August 2023 |
| 25 Aug 2023 | 10436.6 µg/m³ | North-western United States and Canada, August 2023 |
| 26 Aug 2023 | 9633.1 µg/m³ | North-western United States and Canada, August 2023 |
| 21 Aug 2023 | 9633.0 µg/m³ | North-western United States and Canada, August 2023 |
| 8 Apr 2025 | 8828.7 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, Sweet Home, 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/sweet-home/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.
Sweet Home now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 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).