The system has much practical significance in prediction, controlling and tackling the urban pollution problem.
该系统对城市大气环境污染预测、控制、治理等具有重要的实际意义。
Based on the scale of current urban residential and the importance of indoor air quality at homes, the problem of indoor air pollution of four cities in China was studied in this paper.
本论文从目前中国城市住宅的规模和住宅室内空气品质的重要性出发，对中国四城市的住宅室内空气污染问题进行研究。
With the development of highway transportation and urban road construction, the traffic noise pollution becomes very important problem.
随着公路建设和城市交通的飞速发展，交通噪声污染成为道路交通中不可忽视的问题。
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