Fellbach, Baden-Württemberg ( Kazor ) July 4, 2012 – People’s wellness has always depended on the carbon dioxide (CO2) concentration in air.Good-quality air for breathing is essential for well-being, alertness, and concentration, but it is not always found in indoor spaces. Stale air in schools, universities, offices, or meeting rooms often leads to fatigue or headaches, as air in poorly...