Have you ever experienced hui nan tian, or lasting humid (潮湿的) weather? Hui nan tian is a special weather phenomenon (现象) in southern China. It normally appears in spring when temperatures begin to warm up and humidity quickly increases. Before it arrives, there have usually been a few cold days, with a temperature below 12℃. As the cold air goes away, warmer air quickly comes and the temperature rises, creating a lot of water vapor. Small water droplets can be seen on windows and walls.
During hui nan tian, the humid weather makes it easy for bacteria (细菌) to grow. Food goes bad easily, clothes stay wet, and sofas can get moldy. Electrical equipment like televisions may break down when they get wet inside, which can be dangerous for people when turning them on. It can also make people feel tired and sick. Catching a cold is common during this time.
To cut down on the trouble caused by the lasting humid weather, scientists suggest that people in the south should close their windows in the morning and evening, especially those facing south and southeast. At the same time, they should use an air conditioner to dry the room instead of mopping floors. It's also useful to put newspapers on the floor, on tables, and at the door to take in water and wet air.
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