  We numerically investigate the migration of dust particles with initial
orbits close to those of the numbered asteroids, observed trans-Neptunian
objects, and Comet Encke. The fraction of silicate asteroidal particles that
collided with the Earth during their lifetime varied from 1.1% for 100 micron
particles to 0.008% for 1 micron particles. Almost all asteroidal particles
with diameter d>4 microns collided with the Sun. The peaks in the migrating
asteroidal dust particles' semi-major axis distribution at the n:(n+1)
resonances with Earth and Venus and the gaps associated with the 1:1 resonances
with these planets are more pronounced for larger particles. The probability of
collisions of cometary particles with the Earth is smaller than for asteroidal
particles, and this difference is greater for larger particles.
