zahra sadid

In this paper, the quantities of nanomaterials used in the construction industry in Iran in recent years have been estimated. Then the amounts of nanomaterials in different environments of water, air, soil, and municipal wastewater from 2015 to 2019 in Iran have been estimated. The results show that during these few years, the amount of imports of nanoparticles has been more than its production. This study shows that the highest concentrations of nanoparticles in different environments are SiO2, TiO2, Fe2O3, and carbon nanotube, respectively. While the concentration of TiO2 nanoparticles, carbon nanotubes, and Fe2O3 in different environments has increased with a gentle slope during five years. This could be due to the increasing use of these nanoparticles in the industry without control and the lack of appropriate filters to prevent nanoparticles from entering the environment. The results of this study show that during five years, the concentrations of SiO2, TiO2, carbon nanotube, Fe2O3 nanoparticles has increased by about 4%, 30%, 28%, and 45% in water and %11, 16%, 27% and 29% in air, respectively. Also, their concentrations in soil %23, 18%, 43% and 52% and in municipal wastewater %30, 27%, 37% and 61%, respectively.