Using video exposure monitoring to show what works and what doesn't

Background and Objective: Monitoring worker exposures can be done for a number of reasons, aside compliance determinations. When real-time monitoring instruments are used as part of a video exposure monitoring (VEM) tool, it is possible to use this for focusing on the source of the exposure, as well as training workers to help them reduce their exposures. Methods: With the VEM system, a worker wears a real-time air monitor for contaminants such as dust or solvents which collects exposure data while the worker does their job. At the same time, the worker is videotaped. The worker's exposure is translated into a bar chart that moves up and down over time, as the worker's exposure changes. The moving bar chart is superimposed on the video of the worker, either in real-time or back at the lab. This composite video shows the worker's exposure changing as the worker does their job. This can allow us and the worker to see what activities contribute to the exposure, how different procedures affect exposures, and evaluate and demonstrate the effectiveness of exposure controls. Results: We have used the method to show workers the effect of blowing themselves off with compressed air at a machine shop, how a local exhaust ventilation (LEV) system can reduce exposures in a nail salon, and how an LEV can be used effectively to reduce exposures to welding fume and its components in a variety of welding processes.