SmogRank / World / United States / Oregon / August 2024
Most polluted cities in Oregon, United States, August 2024
42 cities in Oregon, United States ranked by their average PM2.5 over the 31 days. Worst: Altamont at 18.9 µg/m³, #93 of 1,962 cities in the world. Cleanest: Dallas at 3.0. 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.
- 1Altamont 16%
- 2Medford 10%
- 3Ashland 6%
- 4Bend 3%
- 5Talent 3%
- 6Ontario 3%
- 7Grants Pass 3%
- 8Redmond 0%
- 9Baker City 0%
- 10Madras 0%
- 11Prineville 0%
- 12La Grande 0%
- 13Hermiston 0%
- 14Pendleton 0%
- 15The Dalles 0%
- 16Cottage Grove 0%
- 17Eugene 0%
- 18Tigard 0%
- 19Canby 0%
- 20Milwaukie 0%
- 20Silverton 0%
- 22Green 0%
- 23Roseburg 0%
- 23Stayton 0%
- 23Sweet Home 0%
- 26Salem 0%
- 27Hillsboro 0%
- 28Portland 0%
- 29Beaverton 0%
- 29Hood River 0%
- 31Albany 0%
- 31Florence 0%
- 33Gresham 0%
- 34Forest Grove 0%
- 35Corvallis 0%
- 35North Portland 0%
- 37Coos Bay 0%
- 37Woodburn 0%
- 39Brookings 0%
- 39McMinnville 0%
- 41Newport 0%
- 42Dallas 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 2024, smogrank.com/us/region/oregon/history/2024-08 (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.