Evaluation of workplace exposure to respirable crystalline silica in
For the crusher and tower operators, the lower end of 95% CI was greater than the 8-hr Alberta OEL (25 μm/m 3), indicating a very high potential for overexposure in this occupation. The RCS exposure levels of occupations within the road construction industry are compared against Alberta 8-hr OEL and shown in Figure 3 .
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