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A typical evaluation of a worker's exposure to an air contaminant requires a pump to draw air through a filter, sampling tube, or other media suitable for collecting the contaminant for a measured period of time. These "integrated" samples provide an indication of the extent of a worker's exposure. Depending on the worker's job tasks, these samples normally do not identify the specific job elements that contribute most to the worker's exposure. To help identify these critical work elements, a technique called video exposure monitoring has been developed by researchers from the National Institute for Occupational Safety and Health. Part 1 of this document (1) outlines the techniques for conducting video exposure monitoring; (2) describes the equipment required to monitor and record worker breathing zone concentrations; (3) discusses the analysis of the real-time exposure data using video recordings; and (4) discusses the use of real-time concentration data from a direct reading instrument to determine a room's effective ventilation rate, the mixing factor, and the room concentration at a given time. Part 2 contains case studies describing a variety of circumstances where the video exposure monitoring techniques provided useful information not obtainable by integrated sampling. Each case study briefly describes the process being monitored and the methodology used to monitor the exposures and, further, discusses the findings and the recommendations derived from the case study. These case studies demonstrate the power and utility of video exposure monitoring.

Analyzing workplace exposures using direct reading instruments and video exposure monitoring techniques.