| Summary: | We calculated the regional deposited dose of inhaled particulate matter based on number/mass concentrations in Amman, Jordan. The dose rate was the highest during exercising but was generally lower for females compared to males. The fine particles dose rate was 10<sup>10</sup>–10<sup>11</sup> particles/h (10<sup>1</sup>–10<sup>2</sup> µg/h). The PM<sub>10</sub> dose rate was 49–439 µg/h for males and 36–381 µg/h for females. While resting, the PM<sub>10</sub> deposited in the head airways was 67–77% and 8–12% in the tracheobronchial region. When exercising, the head airways received 37–44% of the PM<sub>10</sub>, whereas the tracheobronchial region received 31–35%. About 8% (exercise) and 14–16% (rest) of the PM<sub>2.5</sub> was received in the head airways, whereas the alveolar received 74–76% (exercise) and 54–62% (rest). Extending the results for common exposure scenarios in the city revealed alarming results for service workers and police officers; they might receive PM2.5 and 220 µg/h PM<sub>10</sub> while doing their duty on main roads adjacent to traffic. This is especially critical for a pregnant police officer. Outdoor athletic activities (e.g., jogging along main roads) are associated with high PM<sub>2.5</sub> and PM<sub>10</sub> dose rates (100 µg/h and ~425 µg/h, respectively).
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