SmogRank / United States / Washington / Aberdeen
Aberdeen, month by month
Aberdeen, Washington has a measured daily mean on 1,311 days since 1 January 2023. Its worst month was November 2023, at 36 US AQI (6.5 µg/m³), 1,566th of 2,243 cities on that month's world ranking. Its cleanest was March 2026, at 14 US AQI (2.6 µg/m³). 2025 averaged 22 US AQI (3.9 µg/m³), against 20 US AQI (3.6 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
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: 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.
Aberdeen's worst months
| Month | US AQI | World rank |
|---|---|---|
| November 2023 | 366.5 µg/m³ | 1,566thof 2,243 |
| August 2023 | 356.3 µg/m³ | 1,561stof 1,980 |
| January 2025 | 315.5 µg/m³ | 2,124thof 2,474 |
| January 2026 | 285.1 µg/m³ | 2,321stof 2,617 |
| October 2023 | 274.9 µg/m³ | 1,785thof 2,012 |
| November 2025 | 274.8 µg/m³ | 2,447thof 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.
Aberdeen's worst days
| Day | US AQI |
|---|---|
| 27 Aug 2023 | 6918.5 µg/m³ |
| 4 Jul 2025 | 6818.0 µg/m³ |
| 28 Aug 2023 | 6516.6 µg/m³ |
| 4 Jul 2024 | 6415.9 µg/m³ |
| 5 Jul 2023 | 6215.1 µg/m³ |
| 25 Aug 2023 | 6014.0 µg/m³ |
| 20 Aug 2023 | 6013.9 µg/m³ |
| 30 Nov 2023 | 5913.4 µg/m³ |
| 4 Jul 2023 | 5913.2 µg/m³ |
| 29 Nov 2023 | 5913.2 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, Aberdeen, Washington, 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/aberdeen-washington/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.
Aberdeen now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 03:07 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).