Wildfire smoke from Canada and the Western United States stretched across the continent this week, covering skies in a thick haze and triggering health alerts from Toronto to Philadelphia. Air quality remained in the unhealthy range across much of the East Coast on Wednesday morning as the haze pushed southward.
In recent weeks, a series of near-relentless heat waves and deepening drought linked to climate change have helped to fuel exploding wildfires. In southern Oregon, the Bootleg Fire grew so large and hot that it created its own weather, triggering lightning and releasing enormous amounts of smoke. But more than 80 large fires are currently burning across 13 American states, and many more are active across Canada.
Now, the effects are being felt thousands of miles from the flames. Continue reading.