Common sense popularization: What is the dizziness and chest tightness of air-conditioned rooms?

As the saying goes, "There is nothing wrong with it, no money, no money." And the arrival of winter, many friends who often in the air-conditioned room always feel dizzy, chest tightness, but when they go outdoors, they find that there is no big problem. What is this? What happened? In fact, this is very likely to be related to the fact that the air conditioner is not cleaned up in time. The indoor air turbidity naturally leads.

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