Indoor Exposure and Regional Inhaled Deposited Dose Rate during Smoking and Incense Stick Burning-The Jordanian Case as an Example for Eastern Mediterranean Conditions.

Tobacco smoking and incense burning are commonly used in Jordanian microenvironments. While smoking in Jordan is prohibited inside closed spaces, incense burning remains uncontrolled. In this study, particle size distributions (diameter 0.01-25 µm) were measured and inhaled deposited dose rates were calculated during typical smoking and incense stick-burning scenarios inside a closed room, and the exposure was summarized in terms of number and mass concentrations of submicron ( PN Sub ) and fine particles ( PM 2.5 ). During cigarette smoking and incense stick-burning scenarios, the particle number concentrations exceeded 3 × 10 5 cm -3 . They exceeded 5 × 10 5 cm -3 during shisha smoking. The emission rates were 1.9 × 10 10 , 6.8 × 10 10 , and 1.7 × 10 10 particles/s, respectively, for incense, cigarettes, and shisha. That corresponded to about 7, 80, and 120 µg/s, respectively. Males received higher dose rates than females, with about 75% and 55% in the pulmonary/alveolar during walking and standing, respectively. The total dose rates were in the order of 10 12 -10 13 #/h (10 3 -10 4 µg/h), respectively, for PN Sub and PM 2.5 . The above reported concentrations, emissions rates, and dose rates are considered seriously high, recalling the fact that aerosols emitted during such scenarios consist of a vast range of toxicant compounds.