A series of constant-level balloon flights was made in the Crowsnest Pass area under westerly wind conditions, for the purpose of investigating the diffusion properties of the surrounding airshed. The balloon trajectories showed the existence of large sustained velocities over the mountainous region. The magnitudes of the vertical motions were found to be dependent on wind direction. Under moderately strong wind speeds, they appear to have been insensitive to the vertical temperature gradients which were measured within the first 31 m of the ground. Diffusion coefficients were calculated from the tetroon data. They were usually found to be about twice as large as the comparable dnta presented by Pasquill.

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