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Using over a million and a half extragalactic spectra we study the propertiesof the mysterious Diffuse Interstellar Bands (DIBs) in the Milky Way. Thesedata provide us with an unprecedented sampling of the skies at highGalactic-latitude and low dust-column-density. We present our method, study thecorrelation of the equivalent width of 8 DIBs with dust extinction and with afew atomic species, and the distribution of four DIBs - 5780.6A, 5797.1A,6204.3A, and 6613.6A - over nearly 15000 squared degrees. As previously found,DIBs strengths correlate with extinction and therefore inevitably with eachother. However, we show that DIBs can exist even in dust free areas.Furthermore, we find that the DIBs correlation with dust varies significantlyover the sky. DIB under- or over-densities, relative to the expectation fromdust, are often spread over hundreds of square degrees. These patches aredifferent for the four DIBs, showing that they are unlikely to originate fromthe same carrier, as previously suggested.

Dusting off the diffuse interstellar bands: DIBs and dust in extragalactic SDSS spectra