Fig. 3 (IMAGE)

Science China Press

Fig. 3

Caption

Backward trajectories model over 48 hours based on GDAS meteorological data: (a)–(c) spring (April 26th in 2013, 2014, and 2015); (d)–(f)summer (August 22nd in 2013, 2014, and 2015); (g)–(i) autumn (October 6th in 2012, 2013, and 2014). The red line represents the trajectory at an altitude of 50 m, the blue line represents the trajectory at 500 m, and the green line represents the trajectory at an altitude of 1000 m. The asterisk represents the location of the airborne pollen trajectories.

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