Possible applications:Monitoring of open-plan offices, production sites, workshops, etc.For all rooms, in which long and regular people are presentReliable reminder for regular train ventilationThe optical warning device detects increased CO2 loads in indoor areas, in which many people are regularly present. Typically, the production plant, workshop, open-plan offices and, in general, all interior rooms are.1400 ppm CO2 in the room air are already considered "very bad air", the maximum workplace concentration MAK is 5000 ppm in Germany, the CO2 traffic light "factory" thus reminds with its yellow light from 1400 ppm to the extensive train ventilation of the room.Those who have to breathe in bad and consumed air permanently become tired and lose their ability to perform and concentrate. This is particularly noticeable when learning and working. The immune system is also weakened, or noticeably strengthened and stabilized in the case of ever-fresh air, was even evident on the days of ill