"National Academy of Sciences has research dating back to the 1990s which says low dose ionizing radiation is dangerous to human health. Fliers have always had the problem of being exposed to cosmic radiation from outer space. If airlines continue to install Wifi, passengers will have the added problem of being exposed to the additional radiation Wifi generates in a confined space. The environment on planes is dry, oxygen-deficient and humid at the best of times, Wifi in the air will only make it worse."
"What is not being considered is the health risk that WiFi poses to fliers at altitude. This threat concerns all fliers, is real and could potentially be worse than smoking on airplanes was in the 1970's. The question is, does WiFi really serve the interests of fliers long-term? The confined space of the aircraft cabin is already deficient in oxygen at altitude. Once it is pressurized at about 8000 feet, it is positively charged and dry. Barometric pressure is 760 mm Hg at sea level with a corresponding PaO2 (arterial O2 pressure) of 98 mm Hg; the barometric pressure at 8000 feet will be 565 mm Hg with PaO2 of about 55 mm Hg. At an altitude with less oxygen to shield fliers and more emissions and WiFi signals, the cabin environment becomes even more hostile to health.
As inconvenient as it is, fliers are exposed to greater levels of cosmic radiation at high altitude. Proximity to sea level is a factor known to protect us from cosmic radiation's negative effects for a number of reasons. Besides oxygen density, one other reason is the protective field that the Earth emanates. In fact, it is the distinct disconnection from the influence of this field that contributes to the experience of jet lag for fliers. Adding WiFi at altitude further degrades the flying environment without the protections we take for granted on the ground."