Interstellar polarisation and extinction in the Local Bubble and the
  Gould Belt
  We analyse an all-sky compilation of thirteen data sources with optical
interstellar linear polarisation for 3871 {\it Gaia} DR2 and {\it Hipparcos}
stars within 500 pc, which do not exhibit a considerable intrinsic
polarisation. These data are analysed together with five 3D maps and models of
the reddening $E(B-V)$. We consider variations of the polarisation degree $P$,
position angle $\theta$, and polarisation efficiency $P/E(B-V)$ with Galactic
coordinates, distance $R$, and dereddened colour. $P$ shows a maximum at the
Gould Belt mid-plane. $P/R$ drops in the Local Bubble by several times defining
a boundary of the Bubble at $P=0.1$ per cent. All the data sources of the
reddening, except Lallement et al., show a drop of $P/E(B-V)$ in the Bubble. A
significant number of stars with a too high $P/E(B-V)$, where the reddening is
taken from Arenou et al., Drimmel et al. or Lallement et al., either reject the
Serkowski's limit $P/E(B-V)<9.3$ per cent per mag or manifest a systematic
underestimation of the reddening by these data sources. The spatial and colour
dependent variations of $P$ and $E(B-V)$ outside the Bubble compensate each
other, resulting in a nearly constant $P/E(B-V)$. A giant envelope of aligned
dust dominates at middle and high latitudes outside the Bubble. The Markkanen's
cloud, the North Polar Spur, and some other filaments are parts of this
envelope.
