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Video Exposure Monitoring

Video exposure monitoring (VEM) is a technique that uses a direct–reading measurement to test a worker’s exposure while performing a task as it is being recorded on videotape. Thus, VEM consists of logged real-time collection superimposed upon worksite video.

As part of an ongoing project to demonstrate the effectiveness of engineering controls used to reduce the amount of worker exposure to airborne crystalline silica dust, the NJDHSS and other partners are conducting a series of VEM studies.

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Shown below are the products of two VEM studies, one on jackhammering concrete and one on overhead sawing. Each study includes a comparison between a dust-suppression engineering control versus a no-control scenario.

Please contact us if you have any questions.

Jackhammer

In the jackhammer VEM, a side-by-side comparison is presented of work being conducted with and without a water-spray control for silica dust.

Instructions: Click each play button below to launch videos. Allow approximately 5-10 seconds for videos to load. Videos can be played simultaneously. If you cannot view the videos, click: No Control - With Control. If you don't have Windows Media Player, click here to download.

NO CONTROL WITH CONTROL
A worker is breaking up concrete with a jackhammer without any engineering control. The worker is using the jackhammer equipped with a water-spray dust control system.
NOTE: The blue bar on the right graphically represents the real-time concentration of respirable dust in µg/m3, and the read-out information along the top provides time and concentration.

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Right-Angle Saw

In the right-angle saw VEM, a side-by-side comparison is presented of work being conducted with and without a dust-suppression control during structural repair in a concreted parking garage.

Instructions: Click each play button below to launch videos. Allow approximately 5-10 seconds for videos to load. Videos can be played simultaneously. If you cannot view the videos, click: No Control - With Control. If you don't have Windows Media Player, click here to download.

NO CONTROL WITH CONTROL
A worker is using a right-angle saw for overhead sawing and grinding of concrete. The same worker with a vacuum shroud* affixed to the saw. Via the shroud, the silica dust is collected and ducted to a HEPA vacuum.

*available from the manufacturer.
NOTE: The blue bar on the right graphically represents respirable silica dust concentration, while the read-out information along the top provides time and concentration.

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Last Modified: Thursday, 29-Jul-10 09:11:12