Have you ever sat in a meeting or training and become very tired and then you take a break and go outside and you feel so much better until you get back to the training? This is caused by raising of CO2 level which is breath and perspiration which is produced by a person. Not only could you be breathing someone’s bad breath, you could also be breathing in someone’s breath that contains a virus such as a cold, flu or covid.
Which is why it is so important to replace that old stale air with fresh outside air. If you can’t find ways to allow outside air into the building then you can use alternative methods such UV lighting or an Ionization system to help get rid of those viruses and odors.