The Agency for Toxic Substances and Disease Registry (ATSDR) is currently evaluating the potential public health impacts associated with the processing of asbestos-contaminated vermiculite at various facilities around the country. Vermiculite ore contaminated with significant levels of asbestos was mined and milled in Libby, Montana, from the early 1920s until 1990. The majority of the Libby ore was then shipped to processing facilities for exfoliation. ATSDR initiated the National Asbestos Exposure Review (NAER) to identify and evaluate exposure pathways associated with these processing facilities. This manuscript details ATSDR's phased approach in addressing exposure potential around these sites. As this is an ongoing project, only the results from a selected set of completed site analyses are presented. Historical occupational exposures are the most significant exposure pathway for the site evaluations completed to date. Former workers also probably brought asbestos fibers home on their clothing, shoes, and hair, and their household contacts may have been exposed. Currently, most site-related worker and community exposure pathways have been eliminated. One community exposure pathway of indeterminate significance is the current exposure of individuals through direct contact with waste rock brought home for personal use as fill material, driveway surfacing, or soil amendment. Trace levels of asbestos are present in soil at many of the sites and buried waste rock has been discovered at a few sites; therefore, future worker and community exposure associated with disturbing on-site soil during construction or redevelopment at these sites is also a potential exposure pathway.

中文翻译：

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加工石棉污染ver石的场所的暴露途径评估。

有毒物质和疾病登记局（ATSDR）目前正在评估与全国各地各种设施处理石棉污染ver石有关的潜在公共卫生影响。从1920年代初到1990年，在蒙大拿州利比（Libby）开采并研磨了被大量石棉污染的石矿石，并将其磨碎。然后，利比（Libby）矿石的大部分被运往加工设施进行剥落。美国毒物和疾病登记署发起了《国家石棉暴露评估》（NAER），以识别和评估与这些加工设施有关的暴露途径。该手稿详细介绍了ATSDR的分阶段方法，以解决这些地点周围的潜在暴露问题。由于这是一个正在进行的项目，因此仅显示来自一组已完成的现场分析的结果。历史职业接触是迄今为止完成的现场评估中最重要的接触途径。前工人还可能将石棉纤维带到了衣服，鞋子和头发上，并且他们的家庭接触者可能已经暴露在外。当前，大多数与现场相关的工人和社区接触途径已被消除。一种具有不确定性的社区暴露途径是个人当前通过直接接触带回家用作填埋材料，车道铺面或土壤改良的waste石而暴露。在许多地点的土壤中都存在微量的石棉，在少数地点发现了掩埋的废石。因此，