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Through matches with the Sloan Digital Sky Survey (SDSS) catalogue weidentify the location of various families of astronomical objects in WISEcolour space. We identify reliable indicators that separate Galactic/local fromextragalactic sources and concentrate here on the objects in our Galaxy and itsclosest satellites. We develop colour and magnitude criteria that are basedonly on WISE data to select asymptotic giant branch (AGB) stars withcircumstellar dust shells, and separate them into O-rich and C-rich classes.With these criteria we produce an all-sky map for the count ratio of the twopopulations. The map reveals differences between the Galactic disc, theMagellanic Clouds and the Sgr Dwarf Spheroidal galaxy, as well as a radialgradient in the Large Magellanic Cloud (LMC) disc. We find that the C:O numberratio for dusty AGB stars increases with distance from the LMC centre abouttwice as fast as measured for near-IR selected samples of early AGB stars.Detailed radiative transfer models show that WISE colours are well explained bythe emission of centrally heated dusty shells where the dust has standardproperties of interstellar medium (ISM) grains. The segregation of differentclasses of objects in WISE colour space arises from differences in propertiesof the dust shells: those around young stellar objects have uniform densitydistributions while in evolved stars they have steep radial profiles.

The meaning of WISE colours - I. The Galaxy and its satellites