Deterioration of pulmonary function with duration of exposure to .Conclusion: Increased duration of exposure to silica dust may increase the risk . Keywords: Pulmonary function test, Stone crusher workers, Silica, Duration of.stone crusher silica,Silicosis Prevention: Resultsbe exposed to silica dust. •Recognition . 68% of former stone crusher mill workers in Lal Kuan . Nearly 50% of the workers who made silica powder from quartz.
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