The aggregate risk assessment on xylene and ethylbenzene was carried out according to the guidance established newly in 2010 with the purpose of providing information for risk management. In human exposure assessment, the results indicated that lower ages were exposed more and that, in the interior space at home, the highest level of human exposure occurred via inhalation. At outdoor spaces, exposures via inhalation and drinking were less than 1%. In human health risk characterization, xylene showed HI(Hazard Index) < 1 in all ages. When reasonable maximum exposure(RME) was applied, HI for young children was 0.64. The HI of ethylbenzene was also below 1(0.02~0.04) in all ages, indicating no potential risk. From this study, it is considered that xylene need to be continous monitoring with interest because this substance may be more sensitive on young age group. In additon, to reduce the uncertainty of the risk assessment, the korean exposure factors on young age group such as infant, children had to be established as soon as possible.

Abstract
 1. 서 론
 2. 재료 및 방법
 3. 결과 및 고찰
  3.1 노출시나리오
  3.2. 노출평가
  3.3. 위해도 결정
 5. 결 론
 참 고 문 헌

• 서정관(국립환경과학원) | Jung-Kwan Seo (National Institute of Environmental Research) Corresponding author
• 김탁수(국립환경과학원) | Taksoo Kim (National Institute of Environmental Research)
• 김필제(국립환경과학원) | Pilje Kim (National Institute of Environmental Research)