noise standard

例句：

1. 1.The noise level in this area is too high, which is against the noise standard.
   该地区的噪音水平过高，违反了噪音标准。
2. 2.The noise standard for aircraft noise has been set to reduce emissions by 30%.
   飞机噪音的标准已经设定为减少排放量30%。
3. 3.The noise standard for construction work is stricter than that for residential areas.
   建筑施工的噪音标准比住宅区严格。