To study the diurnal behavior of hygro- and thermooptical parameters, the cycles of intensive measurements withartificial humidification and heating of the aerosol under study were carried out four to six times a day. The parameter ofcondensation activity γ characterizes variability of the aerosol scattering coefficient under the change of the relativehumidity of air, and the thermooptical parameters are determined by the decrease of the volume concentration ofparticles in the respective temperature range. Diurnal behavior of the parameter of condensation activity is the mostpronounced in spring. Its characteristic peculiarities are maximum in the daytime (～3 pm) and minimum in the evening(～10 pm). Diurnal behavior of the parameter determining the aerosol fraction evaporated in the temperature range 100 –250°C also is well pronounced.
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