Indoor environment is the place where people spend most of their time throughout their whole life. Accordingly, the assessment of exposure to particulate matter (PM) in indoor environment is crucial in order to determine the possible health effects. In this study, the number concentration of PM range from 10 nm to 10 µm in size, deposition of PM in the respiratory tract, and the inhalation dose for the residents (dormitory, library, canteen, dining-hall, activity center, mosque, gymnasium, hospital, and classroom) were investigated. An optical particle sizer and a NanoScan scanning mobility particle sizer were used to measure the particle number concentrations in the size range of 10 nm to 300 nm and 300 nm to 10 µm, respectively. The total number concentrations varied from 1.32 × 10⁵ cm⁻³ to 1.11 × 10³ cm⁻³. Deposition of particles in the respiratory system was predicted by the ICRP model. It was found that 48% of inhaled particles of 20 nm in size was the deposition in the alveolar region whereas 9.6% and 16% were in the head airway and tracheobronchial region, respectively. Maximum inhalation doses were obtained for ultrafine particles in all microenvironments. Finally, the mass deposition in the gymnasium was the highest although the particle concentration was at the last four among other microenvironments. That means physical exertion is a significant factor besides the particle concentration.

室内环境是人们一生中花费大部分时间的地方。因此，评估室内环境中颗粒物 (PM) 的暴露对于确定可能的健康影响至关重要。在本研究中，PM 的数量浓度范围为 10 nm 至 10 µm，PM 在呼吸道中的沉积以及居民（宿舍、图书馆、食堂、餐厅、活动中心、清真寺、体育馆、医院和教室）进行了调查。分别使用光学粒度仪和 NanoScan 扫描迁移率粒度仪测量粒径范围为 10 nm 至 300 nm 和 300 nm 至 10 µm 的粒子数浓度。总数浓度为 1.32 × 10 ⁵  cm ^-3到 1.11 × 10 ³  cm ^-3。ICRP 模型预测了呼吸系统中颗粒的沉积。发现 48% 的 20 nm 大小的吸入颗粒沉积在肺泡区域，而 9.6% 和 16% 分别沉积在头部气道和气管支气管区域。在所有微环境中获得了超细颗粒的最大吸入剂量。最后，体育馆中的物质沉积最高，尽管颗粒浓度在其他微环境中排在最后四位。这意味着除了粒子浓度之外，体力消耗也是一个重要因素。