Penge is an asbestos-contaminated area with a high incidence of asbestos-related diseases amongst its residents due to exposure to airborne asbestos fibres. The following paper presents an assessment of asbestos fibre exposure in the ambient air of the area. The objective of the study was to quantify the level of airborne asbestos fibre concentration in an endeavour to understand the health risk to which residents are exposed. The study was carried out based on air analyses data of the area acquired from the Council for Geoscience as well as health risk assessment techniques guided by the Risk Assessment Guidance for Superfund (EPA, 1989). It was found that the average asbestos fibre concentration in the ambient air of the study area was 0.047 f/mL which is lower than the 0.2 f/mL limit stipulated by the South African government. However, the asbestos fibre concentration in ambient air of the study area is much higher than the 0.0005 f/mL limit stipulated by the World Health Organization. The average cancer risk for all age groups in the study area was 2.08 × 10⁻³. When compared with the Environmental Protection Agency National Contingency Plan standard which accepts the risks within the range between 10⁻⁴ (0.0001) and 10⁻⁶ (0.000001), it was found that the results obtained in the study area generally exceed the standard. It is recommended that all of the sources of asbestos in the area be rehabilitated.

彭格是一个石棉污染地区，由于接触空气中的石棉纤维，居民中石棉相关疾病的发病率很高。以下文件介绍了该地区环境空气中石棉纤维暴露的评估。该研究的目的是量化空气中石棉纤维的浓度水平，以努力了解居民所面临的健康风险。该研究是基于从地球科学委员会获得的该地区的空气分析数据以及超级基金风险评估指南（EPA，1989）指导的健康风险评估技术进行的。结果表明，研究区环境空气中石棉纤维平均浓度为0.047 f/mL，低于南非政府规定的0.2 f/mL限值。然而，研究区环境空气中石棉纤维浓度远高于世界卫生组织规定的0.0005 f/mL限值。研究区域所有年龄组的平均癌症风险为 2.08 × 10^－3．与环保局国家应急预案标准接受10 ^-4 (0.0001)至10 ^-6 (0.000001)范围内的风险相比，发现研究区取得的结果普遍超标。建议修复该地区的所有石棉来源。