What effect does indoor positive pressure or negative pressure have on human body?

If it affects the human body, the positive and negative air pressure in this normal environment is harmless to the human body.

The adaptability of human body can be well adjusted, but the positive pressure environment is supplemented by purifying fresh air, so the indoor air environment is relatively good, and the home can be well ventilated without opening the window in foggy days, while the fixed-point pumping ability of negative pressure environment should deal with kitchen fumes and bathroom ventilation.

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If there is positive pressure in the room, it will become positive pressure when the new fan sends fresh air indoors. New fans generally have air filtration, so there will be much less dust accumulation in indoor positive pressure environment. However, the disadvantage of positive pressure is that the direction of pressure relief is uncertain, and air will leak wherever it can be ventilated. Therefore, if a room that is prone to smell, such as a toilet, is in a positive pressure environment, the smell will be scattered everywhere.

Negative pressure is generally equipped with an exhaust fan to pump out the turbid air in the room and create a negative pressure environment. Supplementing air from the outside, the exhaust fan takes air at a fixed point, which is very efficient. However, a large amount of floating dust in the outside air will accumulate indoors, causing dust on furniture and increasing the workload of cleaning.