Figure 7 | Scientific Reports

Figure 7

From: Contribution of local and surrounding anthropogenic emissions to a particulate matter pollution episode in Zhengzhou, Henan, China

Figure 7

Backward trajectory from December 19 to 27, 2019 (a–i represent December 19, December 20, December 21, December 22, December 23, December 24, December 25, December 26 and December 27; the light blue track, green track, dark blue track, and red track indicate the air mass track arriving at 00:00, 06:00, 12:00 and 18:00, respectively).

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