Are some host galaxies of SNe Ia actually blueshifting?

Supernova explosions of type Ia (SNe Ia) are now extensively used as "stand ard candles" in modern cosmology, viz. in constructing the Hubble's diagram and hence in determining various cosmological parameters. One of the most important quantities used in such analyses is the redshift of the host gala xy which, in its turn, is determined by identifying the observed spectral l ines with search lines known in the laboratory. The importance of the corre ct identification is therefore appreciated. The present work considers the possibility of misidentification of the observed lines. Alternative identif ication at higher wavelengths leads to blueshifts. Its implication in moder n cosmology is discussed. A tentative model of the universe to interpret th e results is proposed.