SmogRank / Episodes / United States
North-western United States and Canada, November 2024
For 4 days, from 7 to 10 November 2024, 29 cities in the United States and Canada 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. Ended 10 November.
Likely smoke from fires Fires were detected within 300 km of the city on 41% of the counted city-days. Satellites see crop, field and forest fires alike, so this doesn't say which burned.
Cities reached 29 in 2 countries
Days 4 7 to 10 November 2024
Worst day 9 November 22 cities counted
Furthest above usual 7.1× Canby
Day by day
Play 9 November 22 cities at twice their usual or more
Pendleton Tri-Cities La Grande Moses Lake Ephrata Quincy Baker City Ellensburg The Dalles Prineville Pullman Madras Hood River Redmond Bend Ontario Gresham Auburn Salmon Creek Nampa Vancouver Renton Portland North Portland Parkland Bellevue Meridian Ridgefield Tacoma White Center Seattle Garden City Silverton Shoreline Stayton Picnic Point-North Lynnwood Marysville Longview Sweet Home Lacey Chehalis Centralia Castlegar Bremerton Forest Grove Mount Vernon Shelton Dallas Corvallis Hope Port Townsend Oak Harbor Agassiz Cottage Grove Chilliwack Altamont Anacortes Bellingham Abbotsford Lynden Mission Aberdeen Langley Port Angeles Roseburg Victoria Strawberry Hill Port Coquitlam Ashland Coquitlam Talent Medford Cranbrook Langford Delta Burnaby Richmond Vancouver North Vancouver Missoula West Vancouver Duncan North Cowichan Gibsons Twin Falls Harewood Nanaimo Brookings Port Alberni Columbia Falls Grants Pass Yakima Albany Lewiston Eugene Sunnyside Hillsboro Toppenish Sandpoint Spokane Spokane Valley Mead Creston Airway Heights Wenatchee Milwaukie Walla Walla Tigard Beaverton Moscow Coeur d'Alene Prosser Salem McMinnville Woodburn Hermiston Coos Bay Canby 4 Nov 5 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
Sandpoint Sandpoint, 4 November: 13.8 µg/m³ Sandpoint, 5 November: 7.6 µg/m³ Sandpoint, 6 November: 21.8 µg/m³ Sandpoint, 7 November: 38.5 µg/m³, 3.3× its usual 11.8 Sandpoint, 8 November: 36.6 µg/m³, 3.1× its usual 12.0 Sandpoint, 9 November: 45.5 µg/m³, 3.7× its usual 12.2 Sandpoint, 10 November: 37.4 µg/m³, 2.9× its usual 12.8 Sandpoint, 11 November: 11.3 µg/m³ Sandpoint, 12 November: 15.0 µg/m³ Sandpoint, 13 November: 12.8 µg/m³ Moscow Moscow, 4 November: 5.9 µg/m³ Moscow, 5 November: 6.0 µg/m³ Moscow, 6 November: 24.9 µg/m³ Moscow, 7 November: 29.6 µg/m³, 4.7× its usual 6.3 Moscow, 8 November: 15.3 µg/m³ Moscow, 9 November: 11.7 µg/m³ Moscow, 10 November: 13.8 µg/m³ Moscow, 11 November: 5.9 µg/m³ Moscow, 12 November: 7.2 µg/m³ Moscow, 13 November: 8.0 µg/m³ Spokane Valley Spokane Valley, 4 November: 5.1 µg/m³ Spokane Valley, 5 November: 5.6 µg/m³ Spokane Valley, 6 November: 14.8 µg/m³ Spokane Valley, 7 November: 28.1 µg/m³, 3.5× its usual 8.1 Spokane Valley, 8 November: 35.3 µg/m³, 4.3× its usual 8.3 Spokane Valley, 9 November: 35.0 µg/m³, 3.9× its usual 9.0 Spokane Valley, 10 November: 27.0 µg/m³, 3.0× its usual 9.0 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, 4 November: 4.1 µg/m³ Spokane, 5 November: 5.5 µg/m³ Spokane, 6 November: 12.7 µg/m³ Spokane, 7 November: 25.2 µg/m³, 3.1× its usual 8.1 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 Coeur d'Alene Coeur d'Alene, 4 November: 4.4 µg/m³ 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, 4 November: 3.1 µg/m³ 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, 4 November: 4.3 µg/m³ 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, 4 November: 5.3 µg/m³ 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 Lewiston Lewiston, 4 November: 5.5 µg/m³ 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 Mead Mead, 4 November: 5.3 µg/m³ Mead, 5 November: 4.2 µg/m³ Mead, 6 November: 11.0 µg/m³ Mead, 7 November: 21.3 µg/m³ Mead, 8 November: 28.7 µg/m³, 4.0× its usual 7.1 Mead, 9 November: 32.8 µg/m³, 4.5× its usual 7.3 Mead, 10 November: 35.8 µg/m³, 4.3× its usual 8.3 Mead, 11 November: 8.4 µg/m³ Mead, 12 November: 2.0 µg/m³ Mead, 13 November: 4.0 µg/m³ Airway Heights Airway Heights, 4 November: 3.1 µg/m³ Airway Heights, 5 November: 3.5 µg/m³ Airway Heights, 6 November: 11.1 µg/m³ Airway Heights, 7 November: 23.5 µg/m³ Airway Heights, 8 November: 28.1 µg/m³, 4.1× its usual 6.9 Airway Heights, 9 November: 31.4 µg/m³, 4.4× its usual 7.1 Airway Heights, 10 November: 24.8 µg/m³ Airway Heights, 11 November: 8.7 µg/m³ Airway Heights, 12 November: 2.9 µg/m³ Airway Heights, 13 November: 6.0 µg/m³ Eugene Eugene, 4 November: 5.5 µg/m³ 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, 4 November: 5.4 µg/m³ 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, 4 November: 7.1 µg/m³ 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 Columbia Falls Columbia Falls, 4 November: 5.9 µg/m³ Columbia Falls, 5 November: 7.3 µg/m³ Columbia Falls, 6 November: 14.5 µg/m³ Columbia Falls, 7 November: 23.4 µg/m³ Columbia Falls, 8 November: 25.9 µg/m³, 3.0× its usual 8.5 Columbia Falls, 9 November: 22.6 µg/m³ Columbia Falls, 10 November: 26.7 µg/m³, 2.9× its usual 9.1 Columbia Falls, 11 November: 16.4 µg/m³ Columbia Falls, 12 November: 3.0 µg/m³ Columbia Falls, 13 November: 7.7 µg/m³ Tigard Tigard, 4 November: 7.2 µg/m³ 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, 4 November: 3.9 µg/m³ 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, 4 November: 3.9 µg/m³ 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, 4 November: 6.3 µg/m³ 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, 4 November: 4.8 µg/m³ 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, 4 November: 4.6 µg/m³ 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 Toppenish Toppenish, 4 November: 7.0 µg/m³ Toppenish, 5 November: 5.5 µg/m³ Toppenish, 6 November: 9.8 µg/m³ Toppenish, 7 November: 15.8 µg/m³ Toppenish, 8 November: 20.8 µg/m³ Toppenish, 9 November: 27.3 µg/m³, 2.8× its usual 9.8 Toppenish, 10 November: 36.7 µg/m³, 3.7× its usual 9.8 Toppenish, 11 November: 16.0 µg/m³ Toppenish, 12 November: 4.0 µg/m³ Toppenish, 13 November: 5.6 µg/m³ Milwaukie Milwaukie, 4 November: 6.2 µg/m³ 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, 4 November: 3.9 µg/m³ 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, 4 November: 4.3 µg/m³ 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 Creston Creston, 4 November: 5.9 µg/m³ Creston, 5 November: 2.3 µg/m³ Creston, 6 November: 8.6 µg/m³ Creston, 7 November: 17.1 µg/m³ Creston, 8 November: 21.8 µg/m³ Creston, 9 November: 25.3 µg/m³, 4.4× its usual 5.8 Creston, 10 November: 24.3 µg/m³ Creston, 11 November: 15.9 µg/m³ Creston, 12 November: 4.4 µg/m³ Creston, 13 November: 4.4 µg/m³ Prosser Prosser, 4 November: 3.6 µg/m³ Prosser, 5 November: 4.2 µg/m³ Prosser, 6 November: 6.0 µg/m³ Prosser, 7 November: 7.8 µg/m³ Prosser, 8 November: 13.4 µg/m³ Prosser, 9 November: 24.8 µg/m³ Prosser, 10 November: 29.7 µg/m³, 4.8× its usual 6.2 Prosser, 11 November: 15.7 µg/m³ Prosser, 12 November: 1.9 µg/m³ Prosser, 13 November: 2.1 µg/m³ Walla Walla Walla Walla, 4 November: 3.3 µg/m³ 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, 4 November: 10.9 µg/m³ 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 4 Nov 5 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× Prosser Washington, United States 1 10 November 6.2 4.8× Coeur d'Alene Idaho, United States 3 8 November 8.3 4.7× Moscow Idaho, United States 1 7 November 6.3 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× Airway Heights Washington, United States 2 9 November 7.1 4.4× Creston British Columbia, Canada 1 9 November 5.8 4.4× Mead Washington, United States 3 10 November 8.3 4.3× Spokane Valley Washington, United States 4 8 November 8.3 4.3× Spokane Washington, United States 4 9 November 8.9 4.2× Sandpoint Idaho, United States 4 9 November 12.2 3.7× Toppenish Washington, United States 2 10 November 9.8 3.7× 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× Columbia Falls Montana, United States 2 10 November 9.1 2.9×
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 and Canada
Number 47 of 173 episodes in the United States and Canada since our records began, by cities reached.
Eastern United States and Canada, June and July 2023 343 Northern United States and Canada, July 2026 327 United States and Canada, July 2023 322 Eastern United States and Canada, May and June 2023 317 North-eastern United States and Canada, 29 July to 9 August 2025 292 Northern United States and Canada, May and June 2025 247 United States and Canada, June 2023 195 North-western United States and Canada, August 2023 176 North-western United States and Canada, 4 to 22 August 2026 151 Northern United States and Canada, July 2025 139 Northern United States and Canada, June 2025 134 North-western United States and Canada, July and August 2026 118 North-western United States and Canada, November 2024 29 Bars: cities reached; colour: the level of the episode's highest daily reading. All 173 .
Use this page SmogRank, North-western United States and Canada, November 2024: 29 cities with PM2.5 at twice their usual or more, 7 to 10 November 2024, smogrank.com/episodes/2024-11-north-western-united-states-and-canada (accessed 5 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. Fire detections from NASA FIRMS; smoke maps from NOAA HMS.
