To clarify the effect of aerosols as trans-boundary air pollutants on the forest trees of East Asia, we developed methods of visualization of submicron-sized aerosols that were artificially deposited onto leaves or needles to show their localizations and distributions. Firstly, the leaves were artificially exposed to gold (Au) particles as model particles at submicron range. After exposure (deposition of aerosols), we visualized gold particles on the surface of the leaves using field-emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrum (EDX). Secondly, depositions of black carbon aerosol particles onto the adaxial and abaxial surfaces of the leaves or needles of four species of woody plants were examined after exposure to black carbon particles at submicron range. The localization and deposition patterns of black carbon particles differed depending on the type of exposure apparatus and the surface structure of the leaves or needles. Therefore, we concluded that these methods are useful for understanding the mechanisms of the effects of submicron-sized aerosols on the growth and physiological response of trees.