This study came out online in February and provided a very interesting look into the role of human occupancy in relation to indoor biological aerosols. Most strikingly the authors found that millions of bacteria and fungi are added to the air in an occupied room, mostly through stirring up previously deposited organisms.
Yesterday an article about this work came out in Discovery, and since then it’s been all over the press. A few other links are below:
Daily Mail: “Whenever you enter a room you stir 37 million bacteria into the air – every hour”
Forbes: “Study: Humans Add Millions of Microbes to the Air Every Hour”