I had no idea we should be thinking about indoor air pollution just from daily activities.
"Cooking and cleaning are thought to be the main activities through which humans add chemicals to the indoor environment, but we also create emissions by simply existing. Exhaled breath contains carbon dioxide and also a host of organic chemicals such as isoprene, acetone, and acetaldehyde."
And another interesting bit of info:
"And squalene, a primary ingredient in skin oil, is extremely reactive with ozone—a fact that may explain why air travel, which exposes us to the higher ozone concentrations of the upper atmosphere, often leaves us feeling dirty."