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Dust is ubiquitous in the Universe and its influence on the observedElectromagnetic (EM) radiation needs to be correctly addressed. In recent yearsit became clear that scattering of EM radiation from interstellar dust grainscould change the local properties of the observed Cosmic Microwave Background(CMB) radiation. Here we consider the relevant processes of emission andscattering of EM radiation from spinning dust particles, and discuss theirpossible influence on the CMB. In particular, we show that scattered radiationcan establish a correlation between different spectral components of galacticdipolar emission. This could explain the observed correlation between the CMBand the 100-micron thermal emission form interstellar dust. Another importantproperty of CMB is related with its polarisation anisotropies, and theobservation of a cosmological B-mode. We show that scattering of CMB radiationfrom dust grains in the presence of a static magnetic field could indeed createa B-mode spectral component, which is very similar to that due to primordialgravitational waves. This can be described by a kind of Cotton-Mutton effect onthe CMB radiation.

New insight into EM radiation from spinning dust and its influence on the Cosmic Microwave Background