How does the concept of 'dusting' in space compare to terrestrial experience, based on density and impact risk?

The concept is fundamentally flawed; impact risk stems from velocity, not quantity.

Imagining space as a dusty attic leads to a fundamentally flawed understanding of the environment. Space is an extreme vacuum, far emptier than any laboratory-created vacuum on Earth, often containing only about one particle per cubic meter in the interstellar medium. Because the average spacing between particles in the interplanetary medium translates to many meters in any direction, a spacecraft passes through vast regions of near-absolute nothingness. Therefore, the risk does not come from a constant abrasive environment or sheer quantity, but rather from the rare collision involving particles traveling at extremely high kinetic energies, exceeding tens of kilometers per second.