Event Brief
1986 Lake Nyos gas release killed 1,746 people
By The BriefBrief · Sources (1)
Filed: Aug 22, 2026 at 12:06 PM ET
Summary: On 21 August 1986, 1,746 people died after carbon dioxide escaped overnight from the bottom of Lake Nyos in Cameroon, causing poisoning. The piece revisits what happened in the deadliest “limnic eruption” and notes that understanding of volcanic lakes’ danger has continued to evolve 40 years later.
WHO: People who died from carbon dioxide poisoning
WHAT: Carbon dioxide escaped from the bottom of Lake Nyos overnight, leading to poisoning deaths
WHEN: Aug 22, 2026
WHERE: Cameroon
WHY: Cause not yet established.
ℹ️ This event is analyzed using pattern arcs, velocity indicators, and source analysis in our MI Console.
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