Decadal mercury trends from Schrenk spruce (Picea schrenkiana) needles in the Middle Tianshan Mountains, Northwestern China: Evidence of declining industrial emissions and a rising regional background - Huhu Kang; Miaoxin Ji; Xinyu Zhang; Xiaohong Liu; Shichang Kang; Junming Guo; Xiufeng Yin; Qianggong Zhang (Journal of Hazardous Materials, 2026)