It Is Unhealthy to Open Windows in the Early Morning

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It seems very cozy to open windows to refresh the indoor air in the early morning. However, it is not wise for people who live in the city to do it. Around the streets with heavy traffic flow, the lower air is more stable at night than by day and thus, it is against the spread of pollutants. Around 6: 00 in the morning, there are still a lot of pollutants in the air. Such pollutants mainly come from smoke discharged by industries and cars and carbon dioxide from green plants. Some meteorological factors also produce many pollutants. And thus, we can see it is unhealthy to open windows to let stale air in. Generally speaking, people need to open windows for over half an hour in the morning and at the afternoon each for once. 9: 00 – 11:00 a.m. and 2:00 -4:00 p.m. are the best time for opening windows because at that time, air is in the best quality. In addition, kitchen is the source of indoor air pollution. Thus, you’d better to turn on the exhaust fan or the kitchen ventilator when cooking to let the harmful gases out. There are many benefits of opening windows to refresh the air. It is said that when windows are open and air circulation is good, it takes only 15 minutes to refresh the air of all room. If windows are opened constantly, bacteria in the air can be reduced greatly. According to the measurements, there are tens of thousands of bacteria in the air in a place where windows and doors are closed tightly. If windows are opened, bacteria can be reduced greatly. When windows are open, more room can be exposed to the sun light. And thus, ultraviolet rays shine in directly and kill the bacteria. If windows are opened constantly, anions in the air can be increased greatly. Generally speaking, there are 40-50 anions per cubic centimeter of the room, while in the open, there are 100-200 anions. In the countryside, there can be 100-1000 anions and in the

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