Аннотация:Abstract. The authors compared magnetic particles contained in the sediment of urban atmospheric dust with particles related to cosmic dust, which were preserved in ancient sedimentary rock. Mt-microspheres, as well as magnetic particles in the form of twists and shavings, are present both in sedimentary rocks and in settled urban atmospheric dust. Particles extracted from urban dust cannot be attributed by their origin to cosmic particles without special research. Magnetic particles in the form of twists and shavings contained in ancient sedimentary rocks cannot have man-made origin, their terrigenous origin is unlikely, but their formation is possible during the destruction of meteoroids. Magnetic particles in the form of twists and shavings with traces of deformation (the action of friction, shear, stretching forces) are attributed to particles formed in the body of a meteoroid as a result of internal processes leading to the destruction and dispersion of most of its initial substance in the Earth's atmosphere.