正常环境下，细胞在一些酶和抗氧化物质的协助下，可在活性氧的产生和清除之间保持动态稳定。

Under normal circumstances cells are able to maintain an adequate homeostasis between the formation and removal of ROS through particular enzymatic pathways or antioxidants.

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氢氧基（OH）是活性氧中反应性和氧化性极强的氧化物，并会跟挥发性有机化合物（VOC）结合成一些对有害物质，长期身处于这环境绝对是危害人体健康的。

OH-radical is the most reactive and powerful oxidizing active oxygen in the atmosphere. It will combine with Volatile Organic Compound (VOC) to form a noxious compound which will harm people health.

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