Pilots reported Twelve cases of toxic cabin fumes or smoke in four months . 167 cases led pilots to request priority landing , with Mayday call in two . Reignited debate on whether prolonged exposure to air in planes is safe . Many former pilots and aircrew think they 've suffered long-term illnesses .
Pilots reported 167 cases of toxic cabin fumes or smoke in four months . Twelve cases led pilots to request priority landing , with Mayday call in two . Reignited debate on whether prolonged exposure to air in planes is safe . Many former pilots and aircrew think they 've suffered long-term illnesses .