Sampling locations for PM and fallout dust samples around the GEG facilities. Indoor areas including the following (N = 6): iron ore processing plants (i.e., IPP1 before furnace and IPP2 after furnace), iron ore concentration plant (ICP), hematite recovery plant (HRP), primary crusher (PC), and polycom plant (PLY). Outdoor areas included the following (N = 4): tail bin (TB), building number 45 (B No. 45; an official building), the Research and Development Center (R&D Center), and the Mining Operation Office (MOO)