Objective: To understand the current situation of teaching and living environment in primary and secondary schools in Beijing and to provide basis for further intervention. Methods: According to the national plan, an annual average of 92 schools in 16 districts of Beijing were investigated from 2017 to 2020, including school drinking water, canteen, toilet, dormitory management and equipment allocation. Classroom environment of some schools were tested,including the per capita area of classrooms, the agreement rate of desks and chairs distribution, blackboard reflectance, the average illumination and uniformity of desks, the average illumination and uniformity of blackboards, and noise. Results: From 2017 to 2020,most of schools provided water purifiers and direct drinking water, accounting for 85.1% of all investigated schools. The proportion of students canteens in urban schools was increasing,accounting for 90.5% of all schools in 2020. And there was little change in suburban schools,reaching 85.1% in 2020. The proportion of school toilets equipped with soap increased significantly, 92.0% of school toilets were equipped with soap in 2020. The proportion of student dormitories with a per capita area of less than 3 m 2 decreased by year, and all reached the standard in 2020. The qualified rates of various classroom testing indicators, including per capita area in classroom, desk illumination uniformity, and noises, were higher than 80%, while the qualified rates of the blackboard illumination uniformity, desk allotment were lower than 80%. Conclusion The teaching and living environment in Beijing has improved in recent years, but there are still some problems need to be solved.

Objective: To understand the sanitation status of teaching environment of schools in Beijing, and to provide basis for school environmental improvement through monitoring it. Methods: In 2019, 661 primary and secondary schools were selected according to the coverage rate of 50% of all schools. Two classrooms were randomly selected from each school for testing, 1 322 classrooms were monitored. The testing contents included per capita area of the classroom, rate of correct desks-chairs adjusting for school height, blackboard size, reflection ratio of blackboard,illumination, carbon dioxide and noise. Results: The qualified rate of noise(92.3%), per capita area(86.5%), blackboard size (85.6%) and illumination uniformity of table top (83.4%) were higher than 80%, while the qualified rate of other indexes were lower than 80%. In 2019, the qualified rate of blackboard size, blackboard average illuminance and blackboard illuminance uniformity were higher than 2018 year(85.6%, 52.7%, 36.2%; 81.9%, 42.7%, 31.7%)(χ2=10.97, 7.80, 5.90, P<0.05), while the noise (92.3%) was lower than 2018 year(98.3%)(χ2=70.82, P<0.05). Both classroom and blackboard, the average illuminance and evenness of the desk and blackboard installed with LED light were higher than those installed with fluorescent lights. Conclusion Teaching environment monitoring in Beijing is not optimistic. It is necessary to strengthen the promotion and evaluation of standards,and the classroom environment needs to be further improved.