This historical photograph was provided by the Center for Disease Control's (CDC), National Institute for Occupational Safety and Health (NIOSH). It depicted five Baltimore, Maryland, Crown Cork Co. industrial workers inside a factory, four of whom were seated at workstations, which were ventilated by way of overhead units. If, indeed, their immediate areas were cleansed, the outer atmosphere hopefully was being filtered as well, though this is unknown from this image. The men were not wearing filtered breathing masks, nor were they wearing protective goggles. It cannot be determined if gloves were being worn.
CDC/ Barbara Jenkins, NIOSH
November 27, 2012
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