Wildfire smoke from Canada threatens US air quality.

TL;DR Summary
Smoke from Canada's wildfires may return to the US this week, but it won't be as intense as last week. The upper Midwest may see poor air quality over the next few days. Canada had 461 active fires as of Wednesday morning, and 236 were considered "out of control."
- Canadian wildfire smoke may once again affect US air quality this week USA TODAY
- Health: Dangers of wildfire smoke FOX 13 Seattle
- Did you breathe in a lot of wildfire smoke? Here’s what to do next CNN
- Satellite images show Canada wildfire smoke, 'unhealthy' air quality arriving in Upper Midwest New York Post
- Wildfire smoke and dirty air are also climate change problems: Solutions for a world on fire The Conversation
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