Occupational Dust Hazards and Risk Assessment of Coal …
The risk index was divided into 5 levels, namely no hazard (0–6), light hazard (7–11), moderate hazard (12–23), high hazard (24–80), and extreme hazard (>80). The risk index = 2 Health effect grade × 2 Exposure ratio × working condition grade, where the health effect grade was divided according to the content of free silica in the ...
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