The opencast coal mineworkers experience site-specific microenvironments (MEs) during coal production due to different benches. This study investigates the particulate matter (PM_0.5, PM_0.5-1, PM_1-2.5, and PM_2.5-10) exposure in MEs of opencast coal mines near Dhanbad, India. The present study estimates the respiratory deposition doses (RDD) to mineworkers exposed under standard working scenarios at the worksite during day time shift (DTS). The coarser mode particle mass concentration (PMC) and particle number concentration (PNC) are 1.4 to 10.6 and 2 to 7.5 times higher within mines at active mining locations, whereas accumulation mode PMC and PNC is 1.1 to 1.5 and 1.1 to 1.9 times higher outside the mines. The opencast mining-associated activities like the excavation of coal and overburden contribute more to the coarser fraction of particles. However, accumulation mode PMC and PNC dominates at locations with no such mining activities except dumper operations. The average RDD of PMC and PNC during DTS to mineworkers varies from 320.97 μg DTS^-1 and 3.69×10⁸ # DTS^-1 and 3835.71 μg DTS^-1 and 8.79×10⁸ # DTS^-1 respectively. The occupational RDD results reveal that onsite maintenance workers (OM) category of mineworkers are more vulnerable to accumulation mode PMC followed by blasting associated mineworkers (B), onsite executives (EM), maintenance workers (workshop) (MW), monitoring workers (M), HEMMs operators (O), workers at gathering point (G), and official executives (EO). Whereas OM category of workers is more vulnerable to coarser mode PMC followed by B, M, EM, O, MW, G, and EO category of mineworkers.

露天煤矿工人由于工作台的不同，在煤炭生产过程中会遇到特定地点的微环境（ME）。这项研究调查了颗粒物（PM _0.5，PM _0.5-1，PM _1-2.5和PM _2.5-10）暴露在印度丹巴德附近的露天煤矿中。本研究估算了在白天时移（DTS）下在标准工作场景下暴露于工地的矿工的呼吸沉积剂量（RDD）。在活动开采地点的矿井中，粗模式颗粒质量浓度（PMC）和颗粒数浓度（PNC）高1.4至10.6和2至7.5倍，而外部聚集模式PMC和PNC则高1.1至1.5和1.1至1.9倍地雷。露天采矿相关的活动，例如煤和覆盖层的开挖，对颗粒的粗颗粒贡献更大。但是，除自卸车作业外，累积模式PMC和PNC在没有此类采矿活动的地点占主导地位。DTS对矿工的PMC和PNC的平均RDD为320.97μgDTS^-1和3.69×10 ⁸＃DTS ^-1和3835.71μgDTS ^-1和8.79×10 ⁸＃DTS ^-1。RDD的职业结果显示，矿山工人的现场维护工人（OM）类别更容易受到PMC积累模式的影响，其次是爆破相关的矿山工人（B），现场主管（EM），维护工人（车间）（MW），监测工人（M ），HEMM的操作员（O），集合点的工人（G）和正式执行人员（EO）。OM类工人更容易受到粗模式PMC的影响，其次是B，M，EM，O，MW，G和EO类矿工。