Estimation of risk parameters from both indoor and outdoor sources in apartment houses

The aim of this study was to evaluate the indoor/outdoor levels of volatile organic carbons (VOCs) using prediction for 26 apartment houses that are less than 4 years old (ALT4) and/or more than 4 years old (AMT4) in three different cities. The mass balance equation and linear regression analysis were employed to estimate source strength factor and decay constant simultaneously to identify characteristics of indoor air quality of VOCs. We failed to build prediction models for benzene and/orm-xylene compounds because benzene andm-xylene were below the detection limits in the indoor air. The estimation by linear regression for toluene showed a more appropriate fit (R2=0.707) with the Asan data than other two fits for Seoul and Daegu.