The summit of Mt. Fuji reaches into the free troposphere—the atmospheric layer extending from approximately 2,000 meters above sea level to the stratosphere. In
this layer, atmospheric substances can travel vast distances, unaffected by surface friction.
As westerly winds in the Northern Hemisphere carry pollutants and particles from the Eurasian Continent toward the east, Mt. Fuji's position at the continent’s
eastern edge makes it a premier site for long-range atmospheric observation.
