Risk Factor
The number of possible contaminants is enormous since they can have very diverse origins. The building occupants themselves can be one of the most important sources since humans naturally produce carbon dioxide (CO2), water vapour, particles and biological aerosols, being at the same time responsible for the presence of
other pollutants among which the tobacco smoke itself contains more than 3000 compounds, including carbon monoxide (CO), aldehydes, nitrogen oxides, metals, etc.