SmogRank / World / United States / Oregon / August 2025
Most polluted cities in Oregon, United States, August 2025
42 cities in Oregon, United States ranked by their average PM2.5 over the 31 days. Worst: Bend at 10.0 µg/m³, #1,193 of 2,841 cities in the world. Cleanest: Newport at 1.9. A city needs measurements on 70% of the days to be ranked.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Bend 3%
- 2Madras 0%
- 3Hermiston 0%
- 3Prineville 0%
- 5Redmond 0%
- 6Baker City 0%
- 6La Grande 0%
- 8Ontario 0%
- 8Pendleton 0%
- 10Medford 0%
- 11The Dalles 0%
- 12Ashland 0%
- 13Altamont 0%
- 14Talent 0%
- 14Tigard 0%
- 16Cottage Grove 0%
- 17Canby 0%
- 17Eugene 0%
- 19Grants Pass 0%
- 19Hillsboro 0%
- 21Florence 0%
- 22Gresham 0%
- 23Albany 0%
- 24Portland 0%
- 24Silverton 0%
- 26Stayton 0%
- 27Beaverton 0%
- 27Hood River 0%
- 27Oregon City 0%
- 30Salem 0%
- 30Sweet Home 0%
- 32Milwaukie 0%
- 33Green 0%
- 34Roseburg 0%
- 35North Portland 0%
- 36Woodburn 0%
- 37McMinnville 0%
- 38Dallas 0%
- 39Brookings 0%
- 39Coos Bay 0%
- 41Forest Grove 0%
- 42Newport 0%
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
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SmogRank, most polluted cities in Oregon, United States, PM2.5, August 2025, smogrank.com/us/region/oregon/history/2025-08 (accessed 6 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.