are VOCs. These substances are classified in Very Volatile Organic Compound , Volatile Organic Compound , and semivolatile Organic Compound to show the wide range of volatility among organic compounds. VOCs are emitted from many household products, including paints and lacquers, paint strippers, cleaning supplies, combustion appliances, aerosol sprays, glues, adhesives, dry-cleaned clothing, and environmental tobacco smoke. VOCs, which predominantly exist in the vapor phase in the atmosphere, and SVOCs, which exist in both vapor and condensed phase, redistribute to indoor surfaces and may persist from several months to years (Weschler et al., 2008). VOCs are of concern as both indoor air pollutants and as outdoor air pollutants but several studies have reported a two to fivefold increase in indoor concentrations of VOCs as compared to outdoors (Sexton et al. 2004). VOCs emission in Italy are regulated by the legislative decree 152/2006 that establishes thereshold values between 50 mg C/Nm mg C/Nm3. Moreover both adults and children spend an
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