This article has been published in proceedings International Seminar The Impact of Regulation On Tobacco Control, November 2012. Backgrounds. Tobacco is one of the sources of indoor air pollutants. Smoking is hazardous not only for active smokers but also for passive smoker those who have to breathe involuntarily the environmental tobacco smoke (ETS)Objectives. This research analyzes the knowledge, attitude, and behavior risk of pregnant women and environmental tobacco smoke (ETS)Methods. This research was an observational analytical study conducted cross-sectionally among the pregnant women. The samples size ware taken for 45 pregnant women which come to paramedics in Sumber Sari area conducted April to may 2012. The characteristic were collected through interview guide.Results.The Respondent`s Characteristics are in the range 23-35 years old (68,8%), the number of parity is the first pregnant (48,9%), the majority of education in elementary school (31,1%), the majority of working status is housewived (31,1%). The husband`s respondent characteristics are in the range 23-35 years old, the majority of education is a senior high school (28,9%), and working status is nongovernment officials (88,9%).The majority of knowledge is enough (48,9%), neutral attitude about smoke harmful (71,1%), and behavior risk is high (86,7%), and the exposure risk of ETS is high (48,9%).There was a correlation (p= 0,01, α=0,05) between behavior risk and exposure risk of ETS.Conclusions. It concluded that there is behavior risk in pregnant women and exposure risk of ETS. To get the good quality generation in the future, Indonesia must build the policy in health system limiting exposure to ETS especially for pregnant women and fetus.