In Ulaanbaatar, Mongolia, coal combustion in the ger area is the main source of indoor and ambient air pollution that contributes significantly to residents’ health. It was critical to characterize personal exposure to PM_2.5 to help prevent adverse health effects from indoor coal burning. This study compared personal exposure to PM_2.5 between ger and apartment residents and evaluated the influence of time-activity patterns. Two-day personal exposure of 16 couples from gers and 16 couples from apartments in Ulaanbaatar, Mongolia, was measured in January and February 2019. A portable monitor (ASLUNG, Rododo Science, Taipei, Taiwan) was used to measure real-time personal PM_2.5 exposure, and information on participants’ time-activity patterns was recorded in a logbook. Ger residents were exposed to a significantly higher PM_2.5 concentration (59.1(1.7) μg/m³) than apartment residents (26.8(2.0) μg/m³). However, the personal exposure of couples in gers and apartments was not affected by the time-activity pattern. The ambient PM_2.5 concentration was higher than the personal PM_2.5 exposure of ger and apartment residents. Daily personal PM_2.5 exposure profiles of all residents showed a sharp increase at 8:00 a.m. and a decrease after dawn. For all residents, the largest personal PM_2.5 exposure was at home. National measures to reduce ambient PM_2.5 concentrations are necessary for the reduction of personal PM_2.5 exposures of Ulaanbaatar residents.

在蒙古国乌兰巴托，蒙古包地区的燃煤是室内和环境空气污染的主要来源，对居民的健康影响很大。对个人暴露于 PM _{2.5 的情况}进行表征以帮助防止室内燃煤对健康造成不利影响至关重要。本研究比较了蒙古包居民和公寓居民个人接触 PM _{2.5 的情况}，并评估了时间-活动模式的影响。2019 年 1 月和 2 月测量蒙古包 16 对蒙古包和 16 对公寓的 16 对夫妇在 2019 年 1 月和 2 月的个人暴露情况。_2.5暴露，并且参与者的时间活动模式的信息被记录在日志中。Ger 居民接触到的 PM _2.5浓度（59.1(1.7) μg/m ³）明显高于公寓居民（26.8(2.0) μg/m ³）。然而，蒙古包和公寓中夫妇的个人暴露不受时间-活动模式的影响。环境 PM _2.5浓度高于蒙古包和公寓居民的个人 PM _2.5暴露。所有居民的每日个人 PM _2.5暴露情况在上午 8:00 显示急剧增加，并在黎明后减少。对于所有居民，最大的个人 PM _2.5曝光是在家里。降低环境 PM _2.5浓度的国家措施对于减少乌兰巴托居民的个人 PM _2.5暴露是必要的。