This study performed and re-analysed the articles of exposure assessment for the indoor environment of houses in journals related environment in Korea since 1990, and estimated the unit health risk on indoor environment. The objective of this study was to offer scientific data for decision-making of policy for improvement and management of indoor air quality on house in Korea. The pooled concentrations for the critical air pollutants in the house were 13.93±13.91㎍/m3 for PM10, 680±226ppm for CO2, 1.9±1.6ppm for CO, 419±158CFU/m3 for bacteria, 0.036±0.002ppm for NO2 and 104.935±16.424Bq/m3 for Rn, respectively. And the pooled concentrations for the volatile organic compounds were 6.9±6.7㎍/m3 for benzene, 39.3±55.1㎍/m3 for toluene, 4.2±4.0㎍/m3 for ethylbenzene, 11.4±8.3㎍/m3 for m+p-xylene, 4.2±1.5㎍/m3 for styrene and 6.3±4.5㎍/m3 for o-xylene, respectively. The unit cancer risk for men and women by inhalation of benzene was 3.7×10-5 and 4.8×10-6, respec- tively. And hazard indexes for toluene, ethylbenzene, m-p-xylene, styrene, and o-xylene were less than 1. Keywords：Health Risk Assessment, House, Indoor Environment, Critical Air Pollutants, Volatile Organic Compounds