In Taiwan, the import of foreign cigarettes was legalized on January, 1987. The tobacco consumption rate in general population increases from 28.21% in 1986 to 32.5% in 1990 ( Taiwan Tobacco & Wine Monopoly Bureau 1991) . In the meantime, the smoking rate among teen-agers also steadily increases. The smoking rate increases from 12.3% in 1986 to 15.6% in 1991 among students in junior high schools, and increases from 13.8% in 1986 to 17.6% in 1991 among students in high schools ( ROC Department of Health 1991). The successful marketing of imported cigarettes can be best demonstrated by the preference of teenager smokers. The result of a survey conducted in September of 1987, nine months after the cigarettes became legalized, indicates that teenager smokers preferred the imported brands of cigarettes (82.6%) to the domestic brands (10.6%) (The John Tung's Foundation 1987). Considering such a rising trend in cigarette consumption, active as well as passive smoking is expected to be a serious public health problem in Taiwan in the future. In this study, tools of ETS exposure indicators, such as, questionnaire, butt counts and air nicotine concentrations were first evaluated and then applied to estimate schoolchildren's exposure to ETS in Taipei. We will apply the most suitable ETS exposure indicators to a larger population and assess feasible strategies in lowering the public health impact of passive smoking in Taiwan in the future. MATERIALS AND METHODS A stratified sampling method was used in choosing samples. First, we selected three primary schools located in three districts, representing high, middle and low social and economic conditions in Taipei city. Second, we selected three classes, representing 5 to 6 grades, 3 to 4 grades, and 1 to 2 grades in each school. A total of nine classes were chosen. Third, all schoolchildren in these nine classes included as participants. These schoolchildren were asked to fill a questionnaire recalling their time, duration and location of encountering ETS in the previous week. Parents of these children were asked to fill a questionnaire on their social economic status and smoking habits. Two months later, we randomly selected ten children from homes with smokers and three children from homes with nonsmokers in three classes of one school, identified in the previous questionnaire survey, to participate in a field sampling of estimating personal nicotine exposure. A total of 39 schoolchildren were wearing nicotine passive samplers for two two-day periods, representing children's exposure during weekdays and weekend. Among these 39 children, we randomly selected twelve homes of them to measure the nicotine concentrations in their livingrooms and bedrooms, and to count the cigarette butts.
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