Objective: To evaluate the epidemiological characteristic and risk factors of chronic obstructive pulmonary disease (COPD) in the rural area of Beijing. Methods: The data of 1 624 people aged more than 40 in 5 villages in Yanqing County in Beijing were collected. The habitation condition, life and cooking habit, smoking history, personal history and family history were asked, and their physical examinations and lung function tests were conducted. Results: The prevalence of COPD was 9.11% in this area, 15...