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www.youtube.com How and why scientists know it's currently 111 ppm: desertphile.org Atmospheric cyanide fatality dose for human adults: 270 ppm Oral ingestion fatality dose: 200 milligrams Biller, José (2007). "Interface of neurology and internal medicine (illustrated ed.)." Lippincott Williams & Wilkins. p. 939. ISBN 0-781-77906-5. Chapter 163, page 939