Respirable Dust and Respirable Silica Concentrations from Construction Activities

Abstract

Measurements of respirable dust (RD) and respirable crystalline silica (RCS) concentrations are reported for a range of activities, materials and workplaces in the con struction industry. Some activities leading to high dust exposures are identified, such as work in confined spaces, the use of hand-held Stihl™ saws and angle grinders without suppression or extraction, and dry sweeping and removal of rubble. RD and RCS concentra tions are related to conditions on site including such fac tors as the softness, friability and silica content of the material; the weather conditions (dampness) and wheth er indoors or out; the proximity of the source of the dust to the worker's breathing zone, and the use of water sup pression or extraction and general ventilation.