Strings of prayer flags stretch from the tower's pinnacle, and around the base are hundreds of small prayer wheels.
Religion is important here.
The concentration of the metals Al, As, Cr, Co, Cu, Fe, Pb, Ni, and Zn, expressed as total metal, should not exceed 1 mg/L each, and Cd, Hg, and Ag, expressed as total metal, should not exceed 100 ng/L each.