SmogRank / World / United States / Oregon / July 2026
Most polluted cities in Oregon, United States, July 2026
43 cities in Oregon, United States ranked by their average PM2.5 over the 31 days. Worst: La Grande at 34.7 µg/m³, #94 of 2,751 cities in the world. Cleanest: Sweet Home 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.
- 1Baker City 42%
- 2La Grande 39%
- 3Prineville 35%
- 4Ontario 35%
- 5Pendleton 16%
- 6Madras 16%
- 7Redmond 10%
- 8Altamont 10%
- 9Bend 10%
- 10Ashland 6%
- 11Talent 6%
- 12Medford 6%
- 13Hermiston 0%
- 14The Dalles 0%
- 15Tigard 0%
- 16Gresham 0%
- 17Hood River 0%
- 17Stayton 0%
- 19Canby 0%
- 20Hillsboro 0%
- 21Cottage Grove 0%
- 22Eugene 0%
- 23Beaverton 0%
- 24Albany 0%
- 24Grants Pass 0%
- 26Florence 0%
- 26Oregon City 0%
- 26Portland 0%
- 26Salem 0%
- 26Silverton 0%
- 31Woodburn 0%
- 32Brookings 0%
- 33Milwaukie 0%
- 34Coos Bay 0%
- 35Roseburg 0%
- 36Corvallis 0%
- 36Green 0%
- 36North Portland 0%
- 39Newport 0%
- 40Dallas 0%
- 41Forest Grove 0%
- 42McMinnville 0%
- 43Sweet Home 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, July 2026, smogrank.com/us/region/oregon/history/2026-07 (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.