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Link: http://www.dailymail.co.uk/health/article-4465150/Air-circulating-planes-TOXIC.html
Known as 'aerotoxic-syndrome', it can lead to blurred vision, seizures, headaches, nausea, diarrhoea and even breathing difficulties. Last year, three airline crews at the Hartsfield-Jackson International Airport have received emergency medical care with such symptoms. Most of today’s planes have systems in which the cabin contains a mix of recycled air and warm compressed air drawn from their engines.There are seals designed to keep oil and bleed air apart, but they can leak or fail and organophosphates contained in heated engine oil can contaminate the unfiltered bleed air that is pumped into the aircraft cabin.The Boeing 787 Dreamliner is the only aircraft where this does not occur, as it uses electric compressors that take their air from the atmosphere.