Objective To understand the status of dust hazard in the new large coal mines and provide the basis for the prevention of pneumoconiosis.

目的了解新建大型煤矿作业场所粉尘危害状况，为今后开展煤矿尘肺防治工作提供依据。

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Objective To find out the causes and the harm extent of this serious Silica dust hazard event and discuss the prevention and control measures for small scale quartz workplace.

目的了解造成本次严重矽尘危害事件的原因及危害程度，探讨小型石英粉加工企业矽尘危害的预防和控制措施。

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Dust hazard exists in most industrial fields in varying degrees.

尘害在大多数工业领域都不同程度地存在。

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"I don't think anyone in the industry, including ourselves, were fully aware of the potential of dust as a hazard, " Mr. Mechler said.

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The inhalation of these fine dust particles represents a health hazard that was known to the military as long ago as 1974.

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Aviation officials feared the dust could stop jet engines - an unacceptable hazard - and Ms McDonagh was among the thousands left stranded.

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