The diurnal dynamics of the total extinction of optical radiation by aerosol in the near-ground layer and in the atmospheric column in the summer period is studied. It is shown that the dynamics of these characteristics, as well as that of the fine components, is significantly different, which is one of the factors breaking their mutual correlation. It was found experimentally that the peak of aerosol optical depth near 1.06 mkm was observed at 10-11 a.m., rather than at 4-5 p.m. as assumed before. This indicated indirectly that after 11 a.m. the coarse aerosol began to deposit to the lower atmospheric layers. The daily transformation of the average spectral dependence of the effective aerosol height of the atmosphere was analyzed in the region of 0.44-1.06 mkm and a peak in its spectrum was revealed near 0.52-0.56 mkm. This peak was observed only when the fine component of the aerosol depth was minimum. It was assumed that this peak was caused by the medium-disperse particles of possibly stratospheric origin.