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Fuji is a coastal city in Shizuoka Prefecture, Japan, situated on the southern flank of Mount Fuji along the shores of Suruga Bay. This strategic position between Japan's iconic volcanic peak and the Pacific Ocean creates a unique urban geography where dense residential and commercial districts blend with industrial zones and agricultural land. The city lies within the Tokaido industrial belt, with manufacturing facilities producing paper, chemicals, and machinery contributing to regional air pollution. Fuji's terrain slopes gently from the foothills of Mount Fuji toward the coast, creating elevation variations that influence local wind patterns and pollution dispersion. Proximity to Suruga Bay provides maritime influences that can moderate pollution levels, while the urban-rural gradient sees industrial areas concentrated near the coast transitioning to residential zones and tea plantations further inland. The surrounding landscape—dominated by Mount Fuji to the north and the Philippine Sea to the south—creates a natural corridor where pollutants from industrial activities and vehicle emissions can accumulate under specific meteorological conditions. Fuji's location within the densely populated Kanto region means it experiences transboundary pollution from neighboring urban centers like Tokyo and Yokohama, particularly when prevailing winds carry emissions southwestward along the Pacific coast.

Fuji's air quality follows distinct seasonal patterns shaped by its coastal location and regional climate. During winter (December-February), cold air from the Asian continent combines with temperature inversions in the Fuji basin, trapping pollutants from heating systems and industrial emissions, making these months particularly challenging for respiratory health. Spring (March-May) brings cleaner conditions as increased wind circulation from the Pacific disperses pollutants, though occasional yellow dust from continental Asia can cause temporary spikes. Summer (June-August) sees generally good air quality due to strong sea breezes and frequent rainfall washing particulates from the atmosphere, though high humidity can combine with ozone precursors from vehicle emissions to create occasional smog episodes on hot, stagnant days. Autumn (September-November) begins with clean maritime air but transitions to increased pollution as temperatures drop and atmospheric stability returns. Sensitive groups—including those with asthma, children, and elderly residents—should limit prolonged outdoor exertion during winter inversion periods and on summer days when ozone advisories are issued. The best months for outdoor activities are typically April-May and September-October when pollution levels are lowest and meteorological conditions favor pollutant dispersion.