Google Translate to the rescue:
A part of the crew of Air France suffers from altitude sickness as they work on the A380 in the society. This allows union SNPNC. The problems arise because the device can climb quickly and the humidity decreases in the plane.
SNPNC says that about ten percent of the cabin crew complaints after a flight in a Super Jumbo. These symptoms range from headaches and dizziness to coordination problems and shortness of breath. The humidity is according to the union after climbing an A380 of about five percent. According to French labor rules must take an employer action when the humidity drops below forty percent.
Air France within the rule states that staff should not exceed two monthly flights on the A380 making. According SNPNC French aviation authority wants to abandon this rule; the union and the company doctors are against it.
The union finds it remarkable that Air France aircraft deployment to Johannesburg and Mexico City. Those cities are relatively high altitude where the crew rather suffer from altitude sickness.
The union is positive about the Boeing 787, which the cabin pressure is lower. Air France has ordered six Dreamliners.