As shown in Figure 3 , the PM 2.5 concentration from January to December 2015 showed a trend of first declining and then increasing thereafter.
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Using Multisource Data to Assess PM<sub>2.5</sub> Exposure and Spatial Analysis of Lung Cancer in Guangzhou, China.
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It shows a decreasing trend from west to east, and it is lower in the southern and northern parts, which is generally consistent with the spatial distribution pattern of the cumulative concentration of PM 2.5 .