The noise coming from the air-conditioning equipment used by units or self-employed workers shall conform to the environmental noise standard for the locality.
单位和个体经营者使用空调设备产生的噪声，应当符合城市区域环境噪声标准；
The noise pollution is the main object of the environmental pollution which should be controlled in the 21st century, and the noise standard provide basis for controlling noise.
噪声污染是21世纪环境污染的主要控制对象，噪声标准则是噪声控制的依据。
Equipped with pulse filter and silencer, the mill reduces dust and noise greatly, which reaches State Environmental-protection Standard.
脉冲除尘器和消声器的使用减轻了粉尘的污染和噪音，达到国家环保标准。
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