Air pollution in Beijing reached a high level of 99 on the Air pollution Index on Friday as a sandstorm from the northwest shrouded the capital in dust, the China News Service reported.

据中国新闻社报道，北京市区13日遭遇了来自西北方的沙尘袭击，当天该市污染指数一度达到99。

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Objective To evaluate their level of exposure to silica dust in the workers employed in geologic exploration industry using a quantitative method.

目的对接触矽尘的地质勘探工人的接尘水平进行定量评价。

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Methods A hygienic investigation was carried out in a certain artificial gem plant, and dust concentrations and noise level of the workshops were measured.

方法对某宝石厂车间作业环境进行卫生学调查，测量车间环境粉尘和噪声水平。

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Measurements in the town on Monday showed levels of the dust in the air were three times the maximum safety level.

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"Apparently, those did not show any elevated level of concern, especially for asbestos, in the dust, " he said of the Brooklyn samples.

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