Atmospheric polycyclic aromatic hydrocarbons: size distribution, estimation of their risk and their depositions to the human respiratory tract

The secondary objective of this study is to reveal the PAHs that are major contributors to the deposition that contribute to the total deposition of PAHs in the human respiratory tract. The results revealed that the same six PAHs identified using unit risk evaluation were large contributors in all five parts of the respiratory tracts in adult males in spite of deposition process. It was concluded that the reason for this was that these six PAHs had the same size distributions, of which the 0.43-1.1 μm fraction was the most largest, about 57-70% of the whole concentration.