Respiratory Health Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia.
Am J Ind Med. 2019 Jun;62(6):478-485. doi: 10.1002/ajim.22974. Epub 2019 Apr 29.
This study summarized the mass concentration and quartz mass percent of respirable coal mine dust samples (annually, by district, and by occupation) from underground coal mines during 1982-2017.
Respirable dust and quartz data collected and analyzed by Mine Safety and Health Administration (MSHA) were summarized by year, coal mining occupation, and geographical area. The older (before August 2016) 2.0 mg/m respirable dust MSHA permissible exposure limit (PEL) was used across all years for comparative purposes. For respirable dust and quartz, geometric mean and percent of samples exceeding the respirable dust PEL (2.0 mg/m or a reduced standard for samples with >5% quartz content) were calculated. For quartz samples, the average percent quartz content was also calculated.
The overall geometric mean concentration for 681 497 respirable dust samples was 0.55 mg/m and 5.5% of the samples exceeded the 2.0 mg/m PEL. The overall respirable quartz geometric mean concentration for 210 944 samples was 0.038 mg/m and 18.7% of these samples exceeded the applicable standard. There was a decline over time in the percent of respirable dust samples exceeding 2.0 mg/m . The respirable dust geometric mean concentration was lower in central Appalachia compared to the rest of the United States. However, the respirable quartz geometric mean concentration and the mean percent quartz content were higher in central Appalachia.
This study summarizes respirable dust and quartz concentrations from coal mine inspector samples and may provide an insight into differences in the prevalence of pneumoconiosis by region and occupation.
本研究总结了 1982-2017 年期间地下煤矿中可呼吸性煤矿粉尘样本（按年度、地区和职业）的质量浓度和石英质量百分比。
通过矿山安全与健康管理局（MSHA）收集和分析的可呼吸性粉尘和石英数据，按年份、采煤职业和地理区域进行了总结。为了进行比较，所有年份均使用了较旧的（2016 年 8 月之前）2.0mg/m3 的可呼吸性粉尘 MSHA 允许接触限值（PEL）。对于可呼吸性粉尘和石英，计算了几何平均值和超过可呼吸性粉尘 PEL（2.0mg/m3 或对于含石英量超过 5%的样本的降低标准）的样本百分比。对于石英样本，还计算了平均石英含量百分比。
681497 份可呼吸性粉尘样本的总体几何平均值浓度为 0.55mg/m3，5.5%的样本超过了 2.0mg/m3 PEL。210944 份可呼吸性石英样本的总体几何平均值浓度为 0.038mg/m3，其中 18.7%的样本超过了适用标准。随着时间的推移，超过 2.0mg/m3 PEL 的可呼吸性粉尘样本百分比有所下降。与美国其他地区相比，阿巴拉契亚中部地区的可呼吸性粉尘几何平均值浓度较低。然而，阿巴拉契亚中部地区的可呼吸性石英几何平均值浓度和平均石英含量百分比较高。
本研究总结了煤矿检查员样本中的可呼吸性粉尘和石英浓度，可为了解不同地区和职业的尘肺病患病率差异提供参考。
