This investigation was undertaken to study the alterations, if any, in the emotional composure of 25 young adults (age range 21-30 years} during their stay at an altitude of 4,000 m for a period up to two years. Emotional composure was assessed in terms of levels of anxiety, depression, neurotic tendencies and emotional instability. Baseline values were obtained in the plains prior to altitude exposure, and field trials were conducted during exposure after stay periods of 1, 10, 13, 18 and 24 months. Level of anxiety showed only marginal alterations at altitude till 18 months when it became significantly higher. Depression, after recording a significant rise after 10 months, did not reveal any further marked variation with prolongation of stay. Neurotic tendencies and emotional instability did not register any adverse effects during the total period of altitude exposure.