Smoke from the wildfires that are raging across Australia has circumnavigated the globe, NASA say.
This isn’t the first time smoke from a major fire has traveled across the planet. Mike Flannigan, director of the Canadian Partnership for Wildland Fire Science at the University of Alberta in Canada, said it has happened in fires in the United States and Canada in the past.
The reach of wildfire smoke depends on wind patterns and the intensity of the fires. When smoke is ejected high into the atmosphere, it can be transported by winds all the way around the globe. Flannigan said that this can block some sunlight, which could cause a regional cooling effect. Eventually, gravity will likely cause the smoke and ash to settle lower in the atmosphere, closer to the Earth's surface, but he added that this could cause air quality problems and pose health risks.
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