Kwon, K. D., Jo, W. K., Lim, H. J., & Jeong, W. S. (2008). Volatile pollutants emitted from selected liquid household products. Environmental Science and Pollution Research, 15(6), 521-526.The purpose of the paper is to identify common household products that may be potential sources of indoor air pollution in Korea by analyzing their chemical contents. The project was carried out in two stages: firstly, chemical components were identified via gas chromatography and mass spectroscopy to find out the most commonly used substances. Secondly, their proportions were determined and detergent emission compositions were measured by purge-and-trap analysis. The results showed that six chemicals (acetone, ethanol, limonene, perchloroethylene (PCE), phenol, and 1-propanol) were present in all five product classes, including laundry liquid detergents. Additionally several toxic aromatic and chlorinated organic compounds were also identified. The paper noted that other information such as consumers use habit and their indoor environment were also needed to fully evaluate the level of exposure to these pollutants. The paper is useful in our project because of two reasons: firstly it suggests common ingredients in detergents, which are commonly unavailable from product labels, or limited in details from manufacturers websites. Even though this report is done in the Korean market, some ingredients are the staple in the industry and hence are present in products found in Singapore. This can assists our explanation and evaluation of the cleaning performance of detergents. Secondly, the findings of volatile pollutants justifies the one of the purpose of the project: figuring out the optimal type and amount of detergent to achieve good cleaning performance at lowest dose to help limit exposure to possible health hazards.