Perception of cabin air qualilty in airline crew related to air humidification, on intercontinental flights.

The influence of air humidification in aircraft, on perception of cabin air quality among airline crew was investigated in that study. In-flight investigations were performed on eight intercontinental flights with a Boeing 767 : four of them were performed with the air humidification device turned on when going and turned off in the opposite direction. The other four flight had the inverse humidification sequence. The results of measurements are presented along with the analysis of the questionnaires submitted to the crew. It appears that RH can be increased by using ceramic evaporation humidifier without any measurable increase of micororganism in the cabin air and that air humidification can increase the sensation of a better cabin air quality.