According to the Huffington Post, a fire department spokeswoman in the catalonia region said the cloud was caused when chemicals that were being delivered to a warehouse in the city of Igualada mixed, setting off an explosion.

The Catalan commissioner for interior affairs told El Pais that the cloud is taking longer to disperse than expected because there's not enough wind in the area.

In addition to staying inside, and keeping windows shut, El Pais is reporting that parents are to not pick up their children from school.

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Lt. Gov. Burt Jones — pictured at an August rally in Peachtree City that also featured Vice President JD Vance — appears to have scored another legal victory over gubernatorial rival Attorney General Chris Carr in their battle over campaign finance issues. (Arvin Temkar/AJC 2025)

Credit: Arvin Temkar / AJC