Air we breathe in homes
Everybody knows that the air is a basic requirement for life on Earth, but have you thought about that every day we breathe several thousand liters of air around us? Breathing is done completely automatically without us having to think about it. But perhaps there is reason to spare a thought for the air constantly passing our respiratory organs, just as we think about what food we put in us. The daily intake of food and water is about 4 kilos, put this in relation to the 20-30 kg air we breathe every day. Everything we ingest is absorbed by our body, whether it is food, water, or air. This is why the air we breathe in homes is important.
Can we do something about the air we breathe? Yes, we can part. Outdoor air we breathe when we for example go with the children to kindergarten or evening walk with the dog, it is difficult to directly affect, except that maybe we can choose where we live. By selecting the geographical location, we can to some extent choose air quality because there is more/less air pollution in a city, in the countryside, in the suburbs and so on.
Considering that in most countries we are very much staying indoors, it is important that the air is of good quality. When we are at work, at school or in our local shopping centers, we can not normally influence the air. At home, however (which we on average spend more than half of the indoor time) we often have greater opportunities to influence.
A few interesting facts about air we breathe in homes and ventilation
- On average, we spend 90% of their time indoors, it equates to 22 out of 24 hours. And half of this time it is spent in our homes.
- Adults consumes about 30 kg of air per day corresponding to 25,000 liters, 3 kg of H2O (water) and about 1 kg of food.
Ventilation and air change
In a home that is ventilated “well enough” to satisfy minimum requirements, the air change should be 0,5 per hour. The measurement of 0,5 air changes per hour means that the air is replaced after four hours, due to the fact that the newly added air is mixed with the old air and therofre diluted. Both old and new air si then continuously replaced. After four hours the amount of old air is so small that is considered replaced.