Smoke from hundreds of wildfires burning in Canada poses health risks to millions of Americans, especially those with underlying conditions in affected regions. Here’s how to protect yourself. 📷: AP (2) #canada #wildfires #aqi #airquality #smoke #health #wsj #wallstreetjournal #thewallstreetjournal | How to protect yourself from wildfire smoke | Medical masks don’t block the tiny pollutant particles from smoke