In the past, we paid attention to the temperature in the room we live in, sometimes to the humidity. Today we all already know that there are other, invisible for us, but important for our health air parameters. Which we can easily measure and maintain within certain limits so that it to be safer and better for us. These are, for example, carbon dioxide CO2, fine particle matters PM, volatile organic compounds VOC. With a small extra effort we can do a lot for our better health. More info: