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Kuse, a small city nestled within Okayama Prefecture, Japan, presents a unique geographic context influencing its air quality. Located at 35.0759°N, 133.7534°E, the city occupies a relatively flat alluvial plain formed by the Asahi River, a tributary of the Yoshino River. This terrain, typical of the Inland Sea region of Honshu, limits natural air dispersion. The surrounding landscape is predominantly agricultural, with extensive rice paddies and fruit orchards dominating the area, alongside pockets of light industrial activity concentrated along transportation corridors. Kuse’s elevation is low, averaging around 30 meters above sea level, further reducing the potential for atmospheric mixing. Its proximity to the Seto Inland Sea, approximately 30 kilometers south, introduces maritime influences, including humidity and occasional sea breezes, but also the potential for salt spray and associated aerosol pollutants. The urban-rural gradient is relatively sharp; Kuse is surrounded by smaller villages and agricultural land, meaning pollutant sources are not solely concentrated within the city limits. Regional wind patterns, often influenced by the surrounding mountains, play a crucial role in pollutant transport and accumulation, creating localized air quality variations. The city’s position within a basin-like structure can exacerbate pollution episodes, particularly during stable atmospheric conditions.

Kuse’s air quality follows a distinct seasonal pattern, heavily influenced by meteorological conditions. Spring (March-May) often sees increased particulate matter from agricultural burning and dust storms originating from the Asian continent, carried by prevailing westerly winds. Pollen from local flora also contributes to respiratory irritation. Summer (June-August) brings the humid subtropical climate of Okayama, with the rainy season initially offering some cleansing effect, but followed by stagnant air and high ozone formation during periods of intense sunlight and heat. Autumn (September-November) is generally the clearest period, benefiting from cooler temperatures and stronger winds that disperse pollutants. However, temperature inversions can become frequent, trapping pollutants near the ground. Winter (December-February) presents the most challenging conditions. Reduced sunlight, stable atmospheric conditions, and increased use of heating fuels contribute to higher concentrations of particulate matter and nitrogen oxides. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter mornings and periods of temperature inversion. The months of May and October typically offer the most favourable air quality for outdoor pursuits, though monitoring conditions remains essential. Fog, common in winter, can exacerbate particulate pollution.