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The ratio between far-ultraviolet (FUV) and infrared (IR) luminositydensities from z=0 to z=1 is discussed by using the luminosity functions (LFs)of both wavelengths. The FUV LF (z=0-1) based on GALEX has been reported byArnouts et al. (2005), whilst for the IR LF, we used the IRAS PSCz 60-um LF forthe local universe and the Spitzer 15-um LF at higher-z as used by Le Floch etal. (2005). Both luminosity densities show a significant evolutionary trend,but the IR evolves much faster than the FUV. Consequently, the ratio$\rho_{dust}/\rho_{FUV}$ increases toward higher-z, from 4 (local) to 15 (z =1). It is also shown that more than 70% of the star formation activity in theuniverse is obscured by dust at 0.5 < z < 1.2.Comment: 5 pages, 3 figures, accepted for publication in A&A Letter

The evolution of the ultraviolet and infrared luminosity densities in the universe at 0 < z < 1