In this paper we report the gradual change of the physical environment of the Bosscha Observatory in Lembang, Indonesia. From photometric observations carried out in 1982 through 1993 we found a slight increase of the aerosol content in the atmosphere. However, light pollution from the expanding city of Bandung (pop. 2 × 106; 10 km away at 600 m altitude below the Observatory) has produced significant light scattering at zenith distances greater than 55° toward the south.