2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/9864Atmospheric extinction in the V passband at Mount John University Observatory, New Zealand, from 1987-94 is presented and the effect of the 1991 Mount Pinatubo volcanic eruption is discussed.3 pages. LaTeX Version 2.09 TeX Version 3.141 (C version d) Accepted as a `Notes from Observatories' in _The Observatory_Astrophysicstext