不良通风 meaning in Chinese

inadequately ventilated

In fact , it is not always the truth . because of bad ventilation and synthetic material , the concentrations of air contaminations indoors are even higher than that outdoors
由于不良通风和大量化学合成剂在建筑材料中的使用，使得室内空气污染物的浓度有时要高于室外。
Because bad ventilation and a large amount of synthetic material used in the construction material , the concentration of air contaminations indoors are often higher than the outdoors
由于不良通风和大量化学合成剂在建筑材料中的使用，使得室内空气污染物的浓度常常高于室外。