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Longer term, things look a bit more dire, especially for regions closer to the blazes. Forecasters predict Canada will face dry and, in some places, warmer-than-average conditions this summer, so the recipe for wildfires could persist for months. As long as there’s a risk of fire, there’s a risk of far-ranging smoke.

  1. Is wildfire smoke really that dangerous?

Yes, very much so, especially for people who already have lung or heart conditions, people who are pregnant, and children. Here’s how Vox’s resident physician and health reporter, Keren Landman, put it:

Breathing polluted air affects the body in a few different ways. Larger pieces of particulate matter — tiny particles of soot and dust — can irritate the linings of people’s airways in their noses, mouths, throats, and lungs. And smaller bits, along with toxic gases and molecules called volatile organic compounds, can sneak from the lungs into the bloodstream, where they can travel to other organs and cause a wide range of short- and long-term problems.

You can find her full story on the health risks of inhaling smoke here.

People who live in large cities like New York and Boston are already exposed to sources of air pollution including car exhaust. Research suggests that wildfire smoke can be several times more harmful than other sources.

Thankfully, there are pretty easy ways to avoid dangerous exposure, as my colleague Rebecca Leber writes: Stay indoors when you can, wear an N95 mask when you can’t, and pay attention to outdoor air quality forecasts the same way you do the weather.

  1. Are smoky skies the new normal for East Coasters and the upper Midwest?

The world is heating up due to climate change, and warm air can suck moisture out of trees and other plants, making them more flammable. As a result, warming is making fire seasons in Canada, the US, and elsewhere, longer and more severe. Wildfires are now burning larger areas, compared to past decades.

“As the atmosphere warms, the ability to suck moisture out of the fuel [trees and other vegetation] increases almost exponentially,” said Mike Flannigan, a wildland fire professor at the University of Alberta. “So unless we get more rain to compensate for that drying effect, our fields are going to be drier. Most of the models of future fire seasons for Canada look like no change in precipitation or even drier.”

 Communications Nova Scotia /The Canadian Press via AP
Firefighters spray water on a forest fire in Shelburne County, Nova Scotia, on June 1, 2023.

That doesn’t mean that the eastern US will be engulfed in smoke every summer — again, the wind patterns have to be just so — but it does make such a frightening event more likely. What cities on the East Coast are seeing is very much a warning sign of what climate change can bring.

Rachel DuRose contributed reporting to this story.

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