We present mm-wave observations obtained by the BOOMERanG experiment of Galactic emission at intermediate and high (b < -20 deg) Galactic latitudes. We find that this emission is well correlated with extrapolation of the IRAS-DIRBE maps, and is spectrally consistent with thermal emission from interstellar dust (ISD). The ISD brightness in the 410 GHz map has an angular power spectrum c_l = A l^-beta with 2 < beta < 3. At 150 GHz and at multipoles ell ∼ 200 the angular power spectrum of the

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... correlated dust signal is estimated to be l(l+1)c_l/2 pi = (3.7 ± 2.9) uK^2. This is negligible with respect to the CMB signal measured by the same experiment l(l+1)c_l/2 pi = (4700 ± 540) uK^2. For the uncorrelated dust signal we set an upper limit to the contribution to the CMB power at 150GHz and l ∼ 200 of l(l+1)c_l/2 pi < 3 uK^2 at 95