This report summarizes a program to develop and construct an improved light-scattering dust monitor (ilsdm). The ilsdm, which operates on the forward light-scattering principle, provides instantaneous measurements of airborne dust concentrations in units of milligrams per cubic meter. The program was divided into two phases. The first involved the design of the ilsdm and the other included the fabrication of a prototype based on the design. A description of the final ilsdm design, operating conditions, maintenance instructions, and recommendations for additional work are included in the report.