CNN
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Smoke from more than 430 active wildfires in Canada spread south last week and led to the worst pollution the New York and Washington regions have ever experienced. More than 75 million people in the eastern US were under air quality alert as wildfire smoke shrouded major cities. Some flights were grounded, events were canceled, and millions of people breathed unhealthy air.
Much of the smoke has dissipated, but people still have questions. Do we need to be concerned about air quality? What are the short-term effects of wildfire smoke inhalation? Are there long-term consequences? And how can