Assessing 3-D Spatial Extent of Near-Road Air Pollution around a Signalized Intersection Using Drone Monitoring and WRF-CFD Modeling.

The PM 2.5 concentration profile shows a decreasing trend as the altitude increases with the concentration median of 53 μg m –3 on the ground and 44 μg m –3 at the 100 m altitude.

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Therefore, the BC similarly showed an increasing trend during the morning rush hours, and had a 3–6% proportion of PM 1 , even in the outdoor environment of the apartment building.

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