甲醛的挥发是一个很长的过程，根据香港理工大的一项研究表明，新装修的房子里甲醛，要经过2年才能稳定到旧房子的水平。

Formaldehyde volatilization is a long process. According to a study by Hong Kong Polytechnic University, it takes two years for newly decorated houses to stabilize to the level of old houses.

所以其实我们最推荐的办法是开窗通风，而且入住后也要经常通风。不但效果好，而且还完全免费。另外根据之前有热心小伙伴@飞哥桑 做过实验，在通风前人为地升高室内的温度和湿度，利用甲醛在高温高湿环境中加速挥发的特性，加速早期的甲醛挥发，从而降低入住后的甲醛浓度，并且有效缩短晾房的时间。如果屋子本身的自然通风不太好，可以利用空气循环扇，人工加强空气对流。

So in fact, the best way we recommend is to open windows and ventilate regularly. Not only does it work well, but it's completely free. In addition, according to previous experiments conducted by a small enthusiastic partner @Feigosan, the indoor temperature and humidity were artificially raised before ventilation, and the volatilization of formaldehyde in high temperature and humidity environment was accelerated to accelerate the early volatilization of formaldehyde, thereby reducing the concentration of formaldehyde after occupancy and effectively shortening the time of air-conditioning. If the natural ventilation of the house itself is not good, the air circulation fan can be used to artificially enhance air convection.