Simultaneous measurements of short‐lived radon daughter concentrations and atmospheric stability in surface air have been continuously made at a site near the Japan Sea coast for a period of about 1 year. The atmospheric stability is related more closely to the concentration difference with respect to time than to the concentration level at that time.

A simple model is proposed for estimating the mixing depth from the diurnal variation of 222Rn concentration in surface air. The comparison is described between the mixing depth calculated with the model and that determined from observations of temperature profiles with rawinsondes, which indicates good agreement.

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