SmogRank / United States / Oregon / Medford
Medford, month by month
Medford has a measured daily mean on 1,332 days since 1 January 2023. Its worst month was August 2023, at 130 US AQI (47.2 µg/m³), 13th of 1,980 cities on that month's world ranking. Its cleanest was May 2024, at 17 US AQI (3.1 µg/m³). 2025 averaged 46 US AQI (8.3 µg/m³), against 43 US AQI (7.8 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
2 months
| Month | Why |
|---|---|
| Mar 2025 | 18 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 18 of 31 days measured; a month needs 22. The others: 13 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.
Medford's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2023 | 13047.2 µg/m³ | 13thof 1,980 | North-western United States and Canada, August 2023 |
| January 2026 | 6617.2 µg/m³ | 616thof 2,617 | California and Oregon, United States, January 2026 |
| January 2025 | 6215.1 µg/m³ | 483rdof 2,474 | – |
| August 2024 | 6014.0 µg/m³ | 209thof 2,010 | Oregon, Idaho and Utah, United States, August 2024 North-western United States and Canada, August 2024 |
| November 2023 | 5913.5 µg/m³ | 202ndof 2,243 | – |
| November 2025 | 5913.2 µg/m³ | 670thof 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.
Medford's worst days
| Day | US AQI | Episode |
|---|---|---|
| 28 Aug 2023 | 235160.0 µg/m³ | North-western United States and Canada, August 2023 |
| 27 Aug 2023 | 214139.0 µg/m³ | North-western United States and Canada, August 2023 |
| 25 Aug 2023 | 213138.0 µg/m³ | North-western United States and Canada, August 2023 |
| 22 Aug 2023 | 206131.0 µg/m³ | North-western United States and Canada, August 2023 |
| 17 Aug 2023 | 17894.7 µg/m³ | North-western United States and Canada, August 2023 |
| 26 Aug 2023 | 17286.1 µg/m³ | North-western United States and Canada, August 2023 |
| 18 Aug 2023 | 16778.3 µg/m³ | North-western United States and Canada, August 2023 |
| 24 Aug 2023 | 16372.2 µg/m³ | North-western United States and Canada, August 2023 |
| 21 Aug 2023 | 16271.1 µg/m³ | North-western United States and Canada, August 2023 |
| 23 Sept 2023 | 15967.2 µg/m³ | Oregon and California, United States, September 2023 |
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, Medford, 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/medford/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.
Medford now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).