A careful examination of Red Rectangle bands which have been considered as diffuse interstellar bands (DIBs)
in emission shows that a few are likely to be artifacts in the spectrum. Some others result from atmospheric extinction.
Consequences for the Red Rectangle band/DIB associations are examined.
I will also comment a striking resemblance between the DIB spectrum and the spectrum of NO2 in the 6150-6250 Å
region. This suggests that some DIBs could be provoked by atmospheric molecules.