Abstract: Objective To analyze the status and population characteristics of passive smoking among adults in Beijing from 2013 to 2015, so as to provide basis for formulating measures to avoid passive smoking. Methods A stratified 4-stage sampling method was used to select adult residents ≥ 18 years of age in Beijing for a questionnaire survey, which included basic information （including age, gender, home location, education level, marital status, occupation, etc.）, smoking, and passive smoking. Descriptive epidemiological method was used for analysis. Results A total of 11,437 adult residents in Beijing were surveyed from 2013 to 2015, and the total smoking rate was 28.7% （95% CI： 28.0% - 29.6%）. There were significant differences in smoking rate among different ages and genders （all P < 0.01）. The smoking rate of 18-24 years old was 10.3%. After 55 years old, it reached the peak （34.4%） and began to decline slightly. Of the 8,149 never-smokers, the passive smoking rates were 13.5% and 17.2% for definition 1 and definition 2, respectively. There were significant differences in passive smoking rate among adult residents of different genders and ages （all P < 0.01）. The passive smoking rate in women was significantly higher than that of men. The passive smoking rate increased with the increase of age before 55 years old, then began to decrease after 55 years old, and was lowest in the 75-101 years group. The passive smoking rate was significantly different among male residents with different age, education level, occupation, and marital status （all P < 0.01）, and among female residents with different age, education level, occupation, urban and rural areas, and marital status （all P < 0.01）. Conclusion The passive smoking rate of adult residents in Beijing is high, but lower than that of national and other related surveys. Young and middle-aged people, women and individual industrial and commercial occupations are the main groups of passive smoking.

Key words: Smoking, Passive smoking, Influencing factor