A new research has found that dead human skin in the household dust helps to cut the indoor pollution to a certain level. It is believed that humans shed their entire skin once in every two to four weeks. This research has been published in the May issue of Environmental Science & Technology journal.

These human flakes contain skin oils and cholesterol which are a major contribution to office dusts.

The Danish researchers have found that these dead skins keeps the ozone level inside the house less and this ozone is the pollutant which causes irritation of eyes, nose and throat.

"It is only within the last five years that we've grown to appreciate the central role that squalene (from human skin oil) plays in oxidation chemistry within indoor environments", the study authors said in a news release from the American Chemical Society.

The researchers have claimed that cholesterol and squalene have been found in 500 bedrooms and these have affected the air pollution in the rooms. The reduction in air pollution is usually by 2% to 15%.

It has been found that the dead human skin helps to reduce the pollution inside the houses and helps to keep the ozone layer low.