Citizens' right-to-know on environmental and health risks is an important principle in achieving environmental justice. However, it is complicated to communicate the risks due to scientific uncertainty and political involvement. For example, the U.S scientists do not thoroughly admit the link between dioxin exposure and hormonal impacts (e.g. children's birth defect and malformation which appear in present-day Vietnam). One the other side, researchers are concerned about sensitizing the risks that causes excessive public behavior. My previous study presented that the Korean mass media has portrayed multifaceted aspects of dioxin risks, including an endocrine disrupter, a carcinogen, cultural sources (e.g. wasteful lifestyle using disposable plastic materials), and technical sources (e.g. incinerators). In this paper, I present one's awareness, knowledge, and communication channels at the individual level. I conducted a survey on individuals from seven social groups in Jeonju city, Korea (ordinary citizens, the residents living near incineration facilities, governmental experts, NGO members, office workers, two groups of college students from business and environment classes) (N=334). The results indicated that respondents were highly aware of dioxins and had knowledge about various representations of the risk covered by the media. All social groups got the information from open channels (TV, radio, internet), whereas only educational or occupational related groups used closed channels (school education, books, governmental documents). Considering that imperfect information provision causes negative influences on public perceptions of the risk, the results have implications, regarding the importance of the media representations of the risks.