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。
A grey miasma, neither cloud nor mist low in the sky and the atmosphere was stifling.
一些似云非云，似雾非雾的灰气低低的浮在空中，使人觉得憋气。
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