Crump K S, Farrar D B
Clement Associates, Inc., Ruston, Louisiana 71270.
Regul Toxicol Pharmacol. 1989 Aug;10(1):51-62. doi: 10.1016/0273-2300(89)90012-3.
Data from a recent EPA study of airborne asbestos levels in 49 buildings occupied by the General Services Administration (GSA) are statistically analyzed. The study focuses on differences between indoor and outdoor levels, and on differences among buildings with no asbestos-containing material (ACM) (6 buildings), buildings with ACM generally in good condition (6 buildings), and buildings containing damaged ACM (37 buildings). Seven indoor samples and a single outdoor sample were collected from most buildings and analyzed by TEM (transmission electron microscopy) using a direct preparation method. No statistically significant differences were detected in asbestos levels between indoors and outdoors or among the three categories of buildings. The average indoor concentration of asbestos was 0.00073 fibers/cc (f/cc) for all fibers and 0.00007 f/cc for fibers 5 microns or longer. The current OSHA occupational standard is 0.2 f/cc for fibers 5 microns or longer as measured by phase-contrast microscopy.
美国环境保护局（EPA）近期对总务管理局（GSA）所使用的49栋建筑内空气中石棉含量进行了研究，并对相关数据进行了统计分析。该研究聚焦于室内与室外含量的差异，以及不含含石棉材料（ACM）的建筑（6栋）、ACM总体状况良好的建筑（6栋）和含有受损ACM的建筑（37栋）之间的差异。大多数建筑采集了7个室内样本和1个室外样本，并采用直接制备法通过透射电子显微镜（TEM）进行分析。在室内与室外之间或三类建筑之间，未检测到石棉含量存在统计学上的显著差异。所有纤维的室内石棉平均浓度为0.00073纤维/立方厘米（f/cc），5微米或更长的纤维为0.00007 f/cc。职业安全与健康管理局（OSHA）目前的职业标准是，通过相衬显微镜测量，5微米或更长纤维的含量为0.2 f/cc。
