  Interstellar polarization from aligned dust grains can be measured both in
transmission at visible and near-infrared wavelengths and in emission at
far-infrared and sub-mm wavelengths. These observations can help predict the
behavior of foreground contamination of CMB polarimetry by dust in the Milky
Way. Fractional polarization in emission from aligned dust grains will be at
the higher range of currently observed values of 4-10%. Away from the galactic
plane, fluctuations in Q and U will be dominated by fluctuations in intensity,
and less influenced by fluctuations in fractional polarization and position
angle.
