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Fussa, a city nestled within the Tokyo Metropolis of Japan, occupies a strategically significant position west of the capital, bordering Tachikawa and surrounded by a mosaic of agricultural land and suburban development. Its coordinates, 35.7333° N, 139.3333° E, place it within the Kanto Plain, a relatively flat and fertile region characterized by alluvial soils deposited by the Tama River and its tributaries. The city’s terrain is gently undulating, rising slightly towards the west, with elevations generally ranging from 20 to 80 meters above sea level. This low elevation, combined with its proximity to the Tama River, influences local weather patterns and contributes to potential air quality challenges. Fussa’s location is crucial; it acts as a buffer zone between the dense urban core of Tokyo and the more rural landscapes of western Tokyo. While not directly within a major industrial belt, it experiences indirect impacts from industrial activity concentrated further east. The urban–rural gradient is noticeable, with denser residential areas closer to Tachikawa gradually transitioning to agricultural fields and forested areas towards the western periphery. The surrounding landscape is a mix of rice paddies, vegetable farms, and scattered woodlands, contributing to a degree of natural air filtration, though this is often offset by vehicular traffic and suburban sprawl. The city’s western edge borders areas with more significant forest cover, which can influence local wind patterns and pollutant dispersion. The relatively open terrain allows for some degree of air circulation, but also makes Fussa susceptible to pollutants transported from Tokyo.

Fussa’s air quality experiences a distinct seasonal cycle heavily influenced by Japan’s monsoon climate. Spring (March-May) often brings a period of relatively clean air, aided by prevailing westerly winds that sweep across the Kanto Plain, dispersing pollutants. However, this can be punctuated by occasional episodes of stagnant air, particularly during periods of high pressure. Summer (June-August) is typically the most challenging season. The humid, hot conditions often lead to temperature inversions, trapping pollutants close to the ground, especially in the evenings and early mornings. Rainfall is frequent, which helps to cleanse the air, but periods of prolonged heat and humidity can exacerbate ozone formation. Autumn (September-November) sees a gradual improvement in air quality as the monsoon season subsides and cooler, drier air masses become more prevalent. However, agricultural burning in surrounding areas can occasionally contribute to localized pollution events. Winter (December-February) is generally the cleanest season, with cold, dry air and frequent northerly winds that effectively disperse pollutants. Fog, however, can form in the low-lying areas near the Tama River, trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during summer evenings and mornings, limiting strenuous outdoor activity and monitoring for any respiratory discomfort. During periods of agricultural burning in autumn, staying indoors with windows closed is advisable. The interplay of temperature, humidity, wind patterns, and rainfall dictates the air quality experience throughout the year in Fussa.