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。
The grey system assessment method, air pollution integrated index are applied to evaluate the atmosphere, surface water, noise environmental quality of valley cities in western China.
本文首先采用灰色系统评价方法、空气污染综合指数等方法对中国西部河谷型城市大气、地表水、噪声环境质量进行了客观评价。
The results showed that with the main air pollution in China being coal dust, the comprehensive air pollution index of Shenyang was the highest, Dalian the lowest and Zhengzhou in the middle.
结果显示我国大气污染属煤烟型，污染的综合指数以沈阳最高，郑州次之，大连最低。
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