秋冬季天气干燥，为预防流感及新冠病毒，将室内相对湿度控制在40%-60%是最佳选择，空气中的流感病毒存活的数量会降低。也可以帮助减轻流感症状、甚至加快感染后的恢复过程。

The weather in winter is dry. To prevent influenza and Coronavirus, it is the best choice to control the indoor relative humidity at 40%-60%, and the number of influenza viruses in the air will be reduced. It can also help reduce flu symptoms and even speed up the recovery process after infection.