In a Reddit post, one festival-goer said two carbon monoxide alarms went off last night. They warned other revellers to be careful after hearing about people developing headaches. A warning has been issued (Image: Maxar, DigitalGlobe/Getty Images)

Revellers attending the 2025 Burning Man festival have been issued an urgent warning about poisonous gas after people suffered huge headaches. The alert, which was posted on Reddit , said two carbon monoxide alarms went off last night. ‌

The festival-goer said one went off in an RV and another in a tent. "Guys in a tent developed a headache," the post read. ‌

The comment, written by a user by the name of russelltreacy, said: "Make sure your generators air filters are clean. Engines will emit a lot more carbon monoxide when the

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