SmogRank / Episodes / United States
Oregon, Washington and Idaho, United States, November 2024
For 3 days, from 8 to 10 November 2024, 21 cities in the United States had PM2.5 at least twice their usual for the time of year. The worst reading was Canby, Oregon, United States: 46.0 µg/m³ on 9 November, about 7.1× its usual 6.5.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 21 in 1 country
Days 3 8 to 10 November 2024
Worst day 9 November 17 cities counted
Furthest above usual 7.1× Canby
Day by day
Play 9 November 17 cities at twice their usual or more
The Dalles Redmond Bend Tri-Cities Pendleton Ellensburg Gresham Portland Vancouver Salmon Creek Moses Lake Forest Grove Longview Corvallis Dallas Auburn Parkland Tacoma Centralia Renton Lacey Bellevue Columbia City Altamont Seattle Shoreline Bremerton Picnic Point-North Lynnwood Roseburg Marysville Ashland Medford Pullman Aberdeen Moscow Nampa Meridian Boise Grants Pass Yakima Albany Lewiston Eugene Sunnyside Hillsboro Spokane Spokane Valley Wenatchee Milwaukie Walla Walla Tigard Beaverton Coeur d'Alene Salem McMinnville Woodburn Hermiston Coos Bay Canby 5 Nov 6 7 8 9 10 11 12 13 Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.
How it spread
Coeur d'Alene Coeur d'Alene, 5 November: 4.8 µg/m³ Coeur d'Alene, 6 November: 18.1 µg/m³ Coeur d'Alene, 7 November: 23.2 µg/m³ Coeur d'Alene, 8 November: 38.8 µg/m³, 4.7× its usual 8.3 Coeur d'Alene, 9 November: 29.5 µg/m³, 3.4× its usual 8.6 Coeur d'Alene, 10 November: 32.3 µg/m³, 3.5× its usual 9.1 Coeur d'Alene, 11 November: 11.1 µg/m³ Coeur d'Alene, 12 November: 5.2 µg/m³ Coeur d'Alene, 13 November: 8.7 µg/m³ Woodburn Woodburn, 5 November: 5.9 µg/m³ Woodburn, 6 November: 8.0 µg/m³ Woodburn, 7 November: 21.1 µg/m³ Woodburn, 8 November: 37.8 µg/m³, 5.0× its usual 7.6 Woodburn, 9 November: 41.1 µg/m³, 5.4× its usual 7.6 Woodburn, 10 November: 32.8 µg/m³, 4.3× its usual 7.7 Woodburn, 11 November: 4.2 µg/m³ Woodburn, 12 November: 4.2 µg/m³ Woodburn, 13 November: 2.4 µg/m³ Salem Salem, 5 November: 7.8 µg/m³ Salem, 6 November: 12.1 µg/m³ Salem, 7 November: 18.6 µg/m³ Salem, 8 November: 36.3 µg/m³, 4.5× its usual 8.1 Salem, 9 November: 40.9 µg/m³, 5.0× its usual 8.1 Salem, 10 November: 38.0 µg/m³, 4.7× its usual 8.1 Salem, 11 November: 4.3 µg/m³ Salem, 12 November: 4.8 µg/m³ Salem, 13 November: 2.4 µg/m³ Coos Bay Coos Bay, 5 November: 6.1 µg/m³ Coos Bay, 6 November: 7.1 µg/m³ Coos Bay, 7 November: 45.2 µg/m³ Coos Bay, 8 November: 35.3 µg/m³, 6.5× its usual 5.4 Coos Bay, 9 November: 31.9 µg/m³, 6.0× its usual 5.3 Coos Bay, 10 November: 16.5 µg/m³ Coos Bay, 11 November: 2.7 µg/m³ Coos Bay, 12 November: 3.8 µg/m³ Coos Bay, 13 November: 3.7 µg/m³ Spokane Valley Spokane Valley, 5 November: 5.6 µg/m³ Spokane Valley, 6 November: 14.8 µg/m³ Spokane Valley, 7 November: 28.1 µg/m³ Spokane Valley, 8 November: 35.3 µg/m³, 4.4× its usual 8.1 Spokane Valley, 9 November: 35.0 µg/m³, 3.9× its usual 8.9 Spokane Valley, 10 November: 27.0 µg/m³, 3.0× its usual 8.9 Spokane Valley, 11 November: 7.1 µg/m³ Spokane Valley, 12 November: 3.2 µg/m³ Spokane Valley, 13 November: 5.4 µg/m³ Spokane Spokane, 5 November: 5.5 µg/m³ Spokane, 6 November: 12.7 µg/m³ Spokane, 7 November: 25.2 µg/m³ Spokane, 8 November: 32.3 µg/m³, 3.8× its usual 8.6 Spokane, 9 November: 37.5 µg/m³, 4.2× its usual 8.9 Spokane, 10 November: 34.3 µg/m³, 3.7× its usual 9.3 Spokane, 11 November: 9.7 µg/m³ Spokane, 12 November: 3.6 µg/m³ Spokane, 13 November: 4.5 µg/m³ Lewiston Lewiston, 5 November: 4.4 µg/m³ Lewiston, 6 November: 14.4 µg/m³ Lewiston, 7 November: 22.0 µg/m³ Lewiston, 8 November: 31.7 µg/m³, 3.4× its usual 9.4 Lewiston, 9 November: 26.8 µg/m³, 2.7× its usual 9.8 Lewiston, 10 November: 28.8 µg/m³, 2.9× its usual 10.1 Lewiston, 11 November: 9.7 µg/m³ Lewiston, 12 November: 8.9 µg/m³ Lewiston, 13 November: 8.6 µg/m³ Eugene Eugene, 5 November: 7.7 µg/m³ Eugene, 6 November: 19.6 µg/m³ Eugene, 7 November: 22.4 µg/m³ Eugene, 8 November: 28.1 µg/m³, 3.6× its usual 7.9 Eugene, 9 November: 20.3 µg/m³ Eugene, 10 November: 14.3 µg/m³ Eugene, 11 November: 4.1 µg/m³ Eugene, 12 November: 7.8 µg/m³ Eugene, 13 November: 4.2 µg/m³ Canby Canby, 5 November: 6.5 µg/m³ Canby, 6 November: 6.4 µg/m³ Canby, 7 November: 14.5 µg/m³ Canby, 8 November: 27.3 µg/m³, 4.2× its usual 6.5 Canby, 9 November: 46.0 µg/m³, 7.1× its usual 6.5 Canby, 10 November: 17.2 µg/m³ Canby, 11 November: 5.3 µg/m³ Canby, 12 November: 4.7 µg/m³ Canby, 13 November: 2.4 µg/m³ Albany Albany, 5 November: 7.1 µg/m³ Albany, 6 November: 10.0 µg/m³ Albany, 7 November: 20.3 µg/m³ Albany, 8 November: 26.6 µg/m³, 3.3× its usual 8.1 Albany, 9 November: 20.6 µg/m³ Albany, 10 November: 16.9 µg/m³ Albany, 11 November: 3.9 µg/m³ Albany, 12 November: 5.1 µg/m³ Albany, 13 November: 2.7 µg/m³ Tigard Tigard, 5 November: 9.4 µg/m³ Tigard, 6 November: 9.7 µg/m³ Tigard, 7 November: 9.0 µg/m³ Tigard, 8 November: 20.4 µg/m³ Tigard, 9 November: 36.9 µg/m³, 4.5× its usual 8.2 Tigard, 10 November: 31.5 µg/m³, 3.8× its usual 8.2 Tigard, 11 November: 5.5 µg/m³ Tigard, 12 November: 6.0 µg/m³ Tigard, 13 November: 3.8 µg/m³ Hermiston Hermiston, 5 November: 3.4 µg/m³ Hermiston, 6 November: 5.3 µg/m³ Hermiston, 7 November: 10.8 µg/m³ Hermiston, 8 November: 21.3 µg/m³ Hermiston, 9 November: 35.7 µg/m³, 5.2× its usual 6.9 Hermiston, 10 November: 41.9 µg/m³, 6.0× its usual 7.0 Hermiston, 11 November: 21.6 µg/m³ Hermiston, 12 November: 2.1 µg/m³ Hermiston, 13 November: 2.0 µg/m³ McMinnville McMinnville, 5 November: 5.9 µg/m³ McMinnville, 6 November: 7.6 µg/m³ McMinnville, 7 November: 8.3 µg/m³ McMinnville, 8 November: 14.9 µg/m³ McMinnville, 9 November: 30.2 µg/m³, 5.1× its usual 5.9 McMinnville, 10 November: 28.7 µg/m³, 4.5× its usual 6.4 McMinnville, 11 November: 5.1 µg/m³ McMinnville, 12 November: 4.9 µg/m³ McMinnville, 13 November: 2.7 µg/m³ Hillsboro Hillsboro, 5 November: 6.6 µg/m³ Hillsboro, 6 November: 7.1 µg/m³ Hillsboro, 7 November: 9.5 µg/m³ Hillsboro, 8 November: 13.3 µg/m³ Hillsboro, 9 November: 29.1 µg/m³, 3.7× its usual 7.9 Hillsboro, 10 November: 26.1 µg/m³, 3.3× its usual 7.9 Hillsboro, 11 November: 4.9 µg/m³ Hillsboro, 12 November: 5.0 µg/m³ Hillsboro, 13 November: 3.1 µg/m³ Beaverton Beaverton, 5 November: 6.1 µg/m³ Beaverton, 6 November: 7.2 µg/m³ Beaverton, 7 November: 5.1 µg/m³ Beaverton, 8 November: 13.5 µg/m³ Beaverton, 9 November: 27.9 µg/m³, 4.7× its usual 5.9 Beaverton, 10 November: 21.3 µg/m³ Beaverton, 11 November: 3.7 µg/m³ Beaverton, 12 November: 4.3 µg/m³ Beaverton, 13 November: 2.4 µg/m³ Sunnyside Sunnyside, 5 November: 2.4 µg/m³ Sunnyside, 6 November: 6.3 µg/m³ Sunnyside, 7 November: 10.6 µg/m³ Sunnyside, 8 November: 16.2 µg/m³ Sunnyside, 9 November: 27.5 µg/m³, 2.9× its usual 9.4 Sunnyside, 10 November: 33.7 µg/m³, 3.6× its usual 9.4 Sunnyside, 11 November: 19.6 µg/m³ Sunnyside, 12 November: 3.7 µg/m³ Sunnyside, 13 November: 2.6 µg/m³ Milwaukie Milwaukie, 5 November: 8.0 µg/m³ Milwaukie, 6 November: 7.2 µg/m³ Milwaukie, 7 November: 5.0 µg/m³ Milwaukie, 8 November: 18.2 µg/m³ Milwaukie, 9 November: 26.7 µg/m³, 4.5× its usual 5.9 Milwaukie, 10 November: 17.1 µg/m³ Milwaukie, 11 November: 5.4 µg/m³ Milwaukie, 12 November: 4.7 µg/m³ Milwaukie, 13 November: 3.3 µg/m³ Wenatchee Wenatchee, 5 November: 3.0 µg/m³ Wenatchee, 6 November: 6.2 µg/m³ Wenatchee, 7 November: 10.6 µg/m³ Wenatchee, 8 November: 18.3 µg/m³ Wenatchee, 9 November: 26.7 µg/m³, 3.3× its usual 8.1 Wenatchee, 10 November: 36.6 µg/m³, 4.4× its usual 8.3 Wenatchee, 11 November: 20.9 µg/m³ Wenatchee, 12 November: 5.5 µg/m³ Wenatchee, 13 November: 4.1 µg/m³ Yakima Yakima, 5 November: 4.3 µg/m³ Yakima, 6 November: 9.0 µg/m³ Yakima, 7 November: 12.9 µg/m³ Yakima, 8 November: 19.8 µg/m³ Yakima, 9 November: 26.4 µg/m³, 2.5× its usual 10.4 Yakima, 10 November: 32.1 µg/m³, 3.1× its usual 10.5 Yakima, 11 November: 14.3 µg/m³ Yakima, 12 November: 6.3 µg/m³ Yakima, 13 November: no reading Walla Walla Walla Walla, 5 November: 4.0 µg/m³ Walla Walla, 6 November: 7.3 µg/m³ Walla Walla, 7 November: 8.9 µg/m³ Walla Walla, 8 November: 18.8 µg/m³ Walla Walla, 9 November: 23.2 µg/m³ Walla Walla, 10 November: 28.6 µg/m³, 4.5× its usual 6.4 Walla Walla, 11 November: 17.2 µg/m³ Walla Walla, 12 November: 2.4 µg/m³ Walla Walla, 13 November: 1.2 µg/m³ Grants Pass Grants Pass, 5 November: 8.3 µg/m³ Grants Pass, 6 November: 11.4 µg/m³ Grants Pass, 7 November: 14.2 µg/m³ Grants Pass, 8 November: 17.1 µg/m³ Grants Pass, 9 November: 23.8 µg/m³ Grants Pass, 10 November: 28.3 µg/m³, 3.0× its usual 9.5 Grants Pass, 11 November: 7.0 µg/m³ Grants Pass, 12 November: 10.4 µg/m³ Grants Pass, 13 November: 5.2 µg/m³ 5 Nov 6 7 8 9 10 11 12 13 Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more. Good 0–50
Moderate 51–100
Sensitive groups 101–150
Unhealthy 151–200
Very unhealthy 201–300
Hazardous 301+
Every city it reached
City Days Highest Usual Above usual
Canby Oregon, United States 2 9 November 6.5 7.1× Coos Bay Oregon, United States 2 8 November 5.4 6.5× Hermiston Oregon, United States 2 10 November 7.0 6.0× Woodburn Oregon, United States 3 9 November 7.6 5.4× McMinnville Oregon, United States 2 9 November 5.9 5.1× Salem Oregon, United States 3 9 November 8.1 5.0× Coeur d'Alene Idaho, United States 3 8 November 8.3 4.7× Beaverton Oregon, United States 1 9 November 5.9 4.7× Tigard Oregon, United States 2 9 November 8.2 4.5× Walla Walla Washington, United States 1 10 November 6.4 4.5× Milwaukie Oregon, United States 1 9 November 5.9 4.5× Wenatchee Washington, United States 2 10 November 8.3 4.4× Spokane Valley Washington, United States 3 8 November 8.1 4.4× Spokane Washington, United States 3 9 November 8.9 4.2× Hillsboro Oregon, United States 2 9 November 7.9 3.7× Sunnyside Washington, United States 2 10 November 9.4 3.6× Eugene Oregon, United States 1 8 November 7.9 3.6× Lewiston Idaho, United States 3 8 November 9.4 3.4× Albany Oregon, United States 1 8 November 8.1 3.3× Yakima Washington, United States 2 10 November 10.5 3.1× Grants Pass Oregon, United States 1 10 November 9.5 3.0×
Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.
Against other episodes in the United States
Number 50 of 130 episodes in the United States since our records began, by cities reached.
Eastern United States and Canada, 25 June to 2 July 2023 280 North-eastern United States and Canada, July 2026 264 Eastern United States and Canada, May and June 2023 261 North-eastern United States and Canada, 30 July to 9 August 2025 241 Eastern United States and Canada, July 2023 240 North-eastern United States and Canada, 3 to 9 June 2025 196 Eastern United States and Canada, 14 to 19 June 2023 161 North-eastern United States and Canada, 12 to 16 July 2025 119 North-western United States and Canada, August 2023 110 North-eastern United States and Canada, 10 to 14 June 2025 104 North-western United States and Canada, 4 to 11 August 2026 99 North-eastern United States and Canada, 14 to 19 February 2026 96 Oregon, Washington and Idaho, United States, November 2024 21 Bars: cities reached; colour: the level of the episode's highest daily reading. All 130 .
Use this page SmogRank, Oregon, Washington and Idaho, United States, November 2024: 21 cities with PM2.5 at twice their usual or more, 8 to 10 November 2024, smogrank.com/episodes/2024-11-oregon-washington-and-idaho-united-states (accessed 4 October 2026).
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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms .
An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes . Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.
