How wildfire smoke can threaten human health, even when the fire is hundreds of miles away | PBS NewsHour
![NWS Duluth on X: "Where is all of this smoke coming from? The Canadian fires have been giving us poor air quality now and then while the western US fires have made NWS Duluth on X: "Where is all of this smoke coming from? The Canadian fires have been giving us poor air quality now and then while the western US fires have made](https://pbs.twimg.com/media/E6IKdojVUAseBFZ.jpg)
NWS Duluth on X: "Where is all of this smoke coming from? The Canadian fires have been giving us poor air quality now and then while the western US fires have made
![That smoke you see in Colorado is from California, but it's coming from the east. Here's how. | 9news.com That smoke you see in Colorado is from California, but it's coming from the east. Here's how. | 9news.com](https://media.9news.com/assets/KUSA/images/583646551/583646551_1140x641.png)
That smoke you see in Colorado is from California, but it's coming from the east. Here's how. | 9news.com
![Wildfire smoke map: Forecast shows which US cities, states are being impacted by Canadian wildfires - ABC News Wildfire smoke map: Forecast shows which US cities, states are being impacted by Canadian wildfires - ABC News](https://i.abcnewsfe.com/a/708c9502-8d2d-4298-a163-3f61116b49be/map3-abc-ml-230608_1686231063656_hpEmbed_16x9.jpg)
Wildfire smoke map: Forecast shows which US cities, states are being impacted by Canadian wildfires - ABC News
![Over 100 million in eastern US warned of 'unhealthy' air as Canadian wildfire smoke spreads south, west Over 100 million in eastern US warned of 'unhealthy' air as Canadian wildfire smoke spreads south, west](https://images.foxtv.com/static.fox5ny.com/www.fox5ny.com/content/uploads/2023/06/932/524/Canada-Wildfire-Smoke-ZOOM-FRI9-copy.jpg?ve=1&tl=1)
Over 100 million in eastern US warned of 'unhealthy' air as Canadian wildfire smoke spreads south, west
![What's the status of Canadian wildfires sending smoke into the US, and when will it end? | Fox Weather What's the status of Canadian wildfires sending smoke into the US, and when will it end? | Fox Weather](https://images.foxweather.com/static.foxweather.com/www.foxweather.com/content/uploads/2023/06/668/376/Smoke-Clear-Setup1.png?ve=1&tl=1)