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My brother in law argued chemtrails with me for 2 hours at Thanksgiving and one thing he said stuck
He asked me to name the exact altitude where contrails stop and chemtrails start, and I genuinely could not give him a number, which bugged me for a week. So I dug into flight level data for 3 days and found that persistent contrails form mostly between 25,000 and 40,000 feet when humidity is high. Has anyone else gotten stumped by a question like that and actually gone and checked the science?
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