1989 Volume 24 Issue 1 Pages 28-36
Indoor pollution with sprayed-on asbestos and abatement programs were discussed, especially focused on the recent survey for this problem in Japan and the case study for the asbestos removal in Kyoto university. The subcommittee of Kyoto university on asbestos confirmed the necessity for asbestos abatement programs because of the next three points, (1) there is no evidence that no-risk level for asbestos exposure exists, (2) the staff and students had been anxious about their health caused by asbestos exposure, and (3) the good indoor condition is desirable in the facilities for education and research. In the cafeteria in West campus and classrooms of Liberal Arts and Sciences about 2, 000 m2 of ceiling and wall had been sprayed with asbestos which were severely damaged with areas missing, hanging loosely. For emergent abatement program these sprayed-on asbestos were removed being care of the room isolation using containment barriers, the appropriate use of respiratory equipment and so on.
Indoor asbestos concentrations with sprayed-on asbestos were almost equal to the concentration 0.6 f/1 of outdoor environment in the campus of Kyoto university if these rooms had been closed. But it is proved that the man's activity raises indoor airborne asbestos, 3.8 f/1 in case of workers' going in and out and 18 f/1 in case of air moving with fan. The asbestos fiber settling curve after removal was examined as empirical formula and the sufcient airborne asbestos reduction after removal were attained in almost one week. And indoor asbestos fibers after removal were reduced to the same level as the outdoor environment either closed or opened.
