  I review some of the evidences for dust in the Local Bubble and in galactic
halos and show that a general mechanism based on radiation pressure is capable
of evacuating dust grains from regions dominated by massive star energy input
and thus originate huge dusty halos. A Monte Carlo/particle model has been
developed to study the dust dynamics above HII chimneys and the results, among
other findings, show that dust can travel several kpc away from the plane of
the parent galaxy. The cosmological implications of extragalactic dust are
briefly outlined.
