Why Urban Canopy Density in Tokyo’s Residential Districts Modulates Localized Pollen Dispersion Patterns During Cedar Bloom Season

东京住宅区城市冠层密度为何调控日本扁柏花粉在花期的局地扩散模式

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High-resolution LiDAR mapping of Tokyo’s 23 wards reveals that neighborhoods with >68% tree canopy cover exhibit 42% lower airborne Cryptomeria pollen concentrations despite identical regional emission sources.
Computational fluid dynamics simulations demonstrate how dense, multi-layered canopies disrupt horizontal advection, trapping pollen in turbulent eddies below 15 meters—where human breathing zones reside.

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