Table 1.

Potential sources of indoor VOCs.

VOCs	Possible Sources
Formaldehyde	Pesticides, flooring materials, insulating materials, wood-based materials, machine, coatings and paints
Toluene	Pesticides, flooring materials, insulating materials, wood-based materials, paints, adhesives, gasoline, combustion sources
Acetaldehyde	Wood-based materials, flooring materials, HVAC system
Paradichlorobenzene	Ceiling materials, wood-based materials, pesticides
Ethylbenzene	Furniture, paints, adhesives, gasoline, combustion sources
Methylene chloride	Flooring materials, furniture, HVAC system, coatings and paints
Chloroethylene	Flooring materials, coatings and paints, dry-cleaned clothes
Carbon tetrachloride	Coatings and paints, industrial strength cleaners
Chloroform	Pesticide, glue
Naphthalene	Insulating materials, mixed materials, wall painting
Other VOCs (e.g., esters and ketones)	Plastics, resins, plasticizers, solvents usage, flavors, perfumes, paints, disinfectants, adhesives