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。
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。
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。
Construction fugitive dust showed great impact on the ambient PM10 level in Guiyang, and contributed 12% to the annual mean concentration of PM10 over the urban area.
建筑扬尘对贵阳市区较大范围内的PM 10浓度水平均有影响，对整个城区PM 10的年均浓度贡献接近12%。
The Jinlong Dust removal Company product, the variety quality is in the domestic same profession advanced level.
金龙除尘公司产品，品种质量均处于国内同行业先进水平。
The Jinlong Dust removal Company product, the variety quality is in the domestic same profession advanced level.
金龙除尘公司产品，品种质量均处于国内同行业先进水平。
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