Conclusions
The sky brightness at la Silla was measured in the visible and Near IR. The values measured are similar to those obtained at other observatories.
The pollution from la Serena and Vallenar, which is clearly visible by naked eye, does not affect yet the observable sky (Altį”deg) at a significant level. At very low altitudes, the effect of la Serena is already detected. It is therefore important for the La Silla sky to maintain the illumination of La Serena at its current level or better.