This research was supported by the National Science Foundation of China (No. 40121303) ;was supported by the National Basic Research Program of China (G2004CB720200).
Indoor dusffall samples were collected in Pit 1 and Pit 2 of Emperor Qin's Terra-cotta Warriors and Horses Museum in Xi'an, Shaanxi Province, China. The morphological and elemental analysis for long-term (〉10 year...