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Yatomi, nestled in Aichi Prefecture, Japan, occupies a geographically significant position within the broader Chubu region. Located southwest of Nagoya, the prefecture’s capital, Yatomi’s terrain is characterized by gently rolling hills and valleys, a typical feature of the Nobi Plain. The city sits at an elevation of approximately 25 meters (82 feet), contributing to a relatively mild climate. Its proximity to the Ibi River, a vital waterway flowing through Aichi Prefecture, influences local humidity and microclimates. Yatomi’s urban character is a blend of residential areas and light industrial zones, reflecting its role as a commuter town for Nagoya and a regional hub for smaller businesses. The surrounding landscape transitions from urban fringes to agricultural fields, primarily rice paddies and vegetable farms, creating a distinct urban–rural gradient. To the east, the sprawling industrial belt of Nagoya exerts an indirect influence, potentially contributing to regional air pollution transport. The city’s location within the Pacific monsoon climate zone means it experiences distinct wet and dry seasons, impacting local weather patterns and, consequently, air quality dynamics. The relatively flat terrain, while beneficial for agriculture and development, can also exacerbate the accumulation of pollutants under certain meteorological conditions, particularly during periods of temperature inversion. The presence of the Ibi River helps to moderate temperatures locally, but also introduces potential for humidity-related particulate matter formation.

Yatomi’s air quality experiences a distinct seasonal cycle dictated by its Pacific monsoon climate. Spring (March-May) brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, pollen season significantly impacts air quality, triggering respiratory sensitivities for many residents. Summer (June-August) is generally the cleanest period, with frequent rainfall washing away pollutants and strong winds promoting ventilation. High humidity, however, can contribute to the formation of ground-level ozone, particularly during heatwave conditions. Autumn (September-November) sees a return to more variable conditions. While cooler temperatures can lead to stagnant air, the increased frequency of typhoons brings periods of intense rainfall and wind, temporarily improving air quality. The most challenging period is winter (December-February). Cold, stable air masses frequently lead to temperature inversions, trapping pollutants near the ground. Fog, common during these months, further reduces visibility and concentrates particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during prolonged periods of fog or stagnant air in winter. Spring requires vigilance regarding pollen counts, and summer necessitates awareness of potential ozone formation during heatwaves. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, particularly during periods of elevated pollution.