It seems very cozy to open the windows to freshen the indoor air first thing in the morning. However, it is not wise for people who live in the city to do so.
Around busy streets, the lower air is more stable at night than during the day and is therefore against the spread of pollutants. Around 6:00 in the morning, there are still a lot of pollutants in the air. These pollutants mainly come from the smoke emitted by industries and cars and carbon dioxide from green plants. Some meteorological factors also produce many pollutants. And so, we can see that it is not healthy to open the windows to let in the stale air.
Generally speaking, people need to open the windows for more than half an hour in the morning and evening once each. 9:00 a.m. to 11:00 a.m. and 2:00 p.m. to 4:00 p.m. is the best time to open the windows because at that time the air is of better quality. Also, the kitchen is the source of indoor air pollution. Therefore, you’d better turn on the exhaust fan or kitchen fan when cooking to let out harmful gases.
There are many benefits to opening windows to freshen the air. It is said that when the windows are open and the air circulation is good, it only takes 15 minutes to refresh the air in the entire room, greatly reducing carbon dioxide.
If the windows are constantly opened, the bacteria in the air can be greatly reduced. According to measurements, there are tens of thousands of bacteria in the air in a place where the windows and doors are tightly closed. If the windows are open, bacteria can be greatly reduced. When the windows are open, more space can be exposed to sunlight. And so the ultraviolet rays shine directly and kill bacteria.
If the windows are constantly open, the anions in the air can be greatly increased. Generally speaking, there are 40-50 anions per cubic centimeter of the room, while outdoors there are 100-200 anions. In the field, there may be 100-1000 anions and in the forests or by the sea, there may be up to 20,000 anions. And why are we so concerned about anions? This is because anions can improve lung functions, stimulate the central nervous system, and promote blood circulation and hematopoiesis. And for that, it is called “vitamin in the air”. The increase of anions in the air can refresh the brain and make people feel relaxed and healthy.