It is a building free of pollutants such as VOCs and mercury, thus guaranteeing air quality.

该建筑没有任何污染物的排放，例如有机挥发物和汞，所以也有利于保证空气质量。

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VOC free - VOCs, or volatile organic compounds, are chemicals that can be emitted as gas from either a solid or a liquid.

不含VOC——VOCs，或者挥发性有机化合物，是从固体或者液体中散发出来的化学气体。

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