Directed studies showing that most human
exposure occurs at home due to consumer products (solvents, paints, fire retardants, plasticizers such as phthalates and bis - phenol), indoor combustion, building materials (formaldehyde), water treatment (chloroform), smoking (benzene), cooking (fine and ultrafine
particles), air «fresheners» (para-dichlorobenzene,
alpha - and beta - pinene), etc..