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Shintomi, nestled in Miyazaki Prefecture on the island of Kyushu, Japan, occupies a geographically significant position within a landscape sculpted by volcanic activity and coastal influences. Located at approximately 32.0689° N, 131.4881° E, the town sits within the Nichinan Plains, a broad, fertile expanse bordered by the steep slopes of the western Kyushu Mountains. This terrain creates a funneling effect, potentially trapping pollutants under certain meteorological conditions. The elevation varies gently across the town, generally ranging from 20 to 80 meters above sea level, minimizing significant altitude-related air quality variations within Shintomi itself. The town’s proximity to the East China Sea (approximately 10km) introduces a maritime influence, with prevailing sea breezes playing a crucial role in air circulation and dispersion. Surrounding Shintomi is a mosaic of agricultural land, primarily dedicated to rice cultivation and citrus fruit orchards, contributing to potential biogenic volatile organic compound (BVOC) emissions, particularly during warmer months. Further inland, the mountainous terrain supports mixed forests, which can act as both a carbon sink and a source of particulate matter during periods of forest fires or dry winds. While Shintomi itself is a relatively small town, it lies within a broader regional context that includes the industrial activity of larger cities like Miyazaki, whose emissions can occasionally be transported by prevailing winds. The urban-rural gradient is gradual, with agricultural fields seamlessly transitioning into residential areas, minimizing sharp boundaries but potentially influencing local air quality patterns.

Shintomi’s air quality experiences a distinct seasonal rhythm dictated by Kyushu’s subtropical climate and prevailing weather patterns. Spring (March-May) sees a gradual increase in temperatures and humidity, accompanied by the blooming of citrus orchards, which release BVOCs, potentially contributing to ozone formation. While generally pleasant, stagnant air during periods of high pressure can lead to localized pollutant accumulation. Summer (June-August) is characterized by hot, humid conditions and the potential for occasional typhoons. The monsoon season brings periods of heavy rainfall, effectively scrubbing the atmosphere and improving air quality. However, the aftermath of typhoons can stir up dust and debris, temporarily degrading conditions. Autumn (September-November) is often considered the most favorable time for outdoor activities, with cooler temperatures, drier air, and consistent sea breezes promoting good air dispersion. However, agricultural burning practices in surrounding rural areas can occasionally introduce particulate matter. Winter (December-February) presents the greatest air quality challenges. Temperature inversions, where cold air becomes trapped beneath a layer of warmer air, are more frequent, hindering vertical mixing and allowing pollutants to accumulate near the ground. Fog, common during this season, further exacerbates the problem by trapping particles. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, particularly on days with persistent fog or temperature inversions. Maintaining indoor air quality through ventilation and air purification can be beneficial during these periods.