Changes for amounts of elements involved in atmospheric pollution in rooftop turfs over the years

We investigated changes for amounts of 14 elements involved in atmospheric pollution in rooftop turfs over the years. All elements concentrations of grasses in rooftop turfs increased after completion and amounts of all elements except for thallium (Tl) of grasses and organic layer increased with age. These results suggested that the deposite elements in grasses accumulated in organic layer as thach. In addition, amounts of cadmium (Cd), plumbum (Pb), nickel (Ni), copper (Cu), zinc (Zn), and argentum (Ag) per unit area of rooftop turf increased after completion. Therefore, it was shown that rooftop turfs have atmosphere purifying capacity.