Occupational exposure to fine particulate matter in the reinforced concrete production and its association with respiratory symptoms and lung function.

When sampling locations were compared to each other, we found a highly significant difference between the median concentrations (Kruskall-Wallis p < 0.001).

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Respiratory personal protective equipment (PPE) should be widely used, given that the individual metal absorption in metalworkers and welders may be significant [ 25 ] and respirators have been shown efficient with regard to welding fumes [ 26 ].

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