Spatial and Temporal Distribution of Pollution Based on Magnetic Analysis of Soil and Atmospheric Dustfall in Baiyin City, Northwestern China.

In addition, the mean value of χ lf presents clear annual variations and a decreasing trend (827 × 10 −8 m 3 kg −1 , 848 × 10 −8 m 3 kg −1 , 660 × 10 −8 m 3 kg −1 , 543 × 10 −8 m 3 kg −1 , 463 × 10 −8 m 3 kg −1 , 472 × 10 −8 m 3 kg −1 for the years of 2012, 2013, 2014, 2015, 2016 and 2017, significantly), especially since 2014 ( Figure 4 ).

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