《Table 1 Statistics of the contents of pollution end-member elements in Jining》

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《"Geochemical Characteristics and Pollution Source Identification of the Near-surface Atmosphere Dust-fall in Jining City,Eastern China"》

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The content of Hg should be multiplied by 10-9；the contents of S，Ti，Al2O3，Ca O，K2O and Mg O should be multiplied by 10-2；the contents of remaining elements should be multiplied by 10-6；and--means not counted.

As shown in Table 1，the contents of most indicators from building dust and coal combustion were mostly stable，while the variable ranges of indicator contents from automobile exhaust were larger，for example，the maximum of Zn content was 34.67 times of the minimum in the automobile exhaust，and the maximum of Ti was 30.18 times of the minimum.These conditions might be connected with automobile performance and fuel quality，but the mean data still could reflect the overall level of element pollution from automobile exhaust.