The road traffic noise has 17% city to be the moderate pollution, 49% city approximately is the mild pollution, 25% sound environment quality is good.

道路交通噪声中约有17%的城市属中度污染、49%的城市属轻度污染、25%的声环境质量较好。

youdao

The road traffic noise has 17% city to be the moderate pollution, 49% city approximately is the mild pollution, 25% sound environment quality is good.

道路交通噪声中约有17%的城市属中度污染、49%的城市属轻度污染、25%的声环境质量较好。

youdao