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Kurayoshi, nestled in the Tottori Prefecture of Japan, presents a unique geographic setting that significantly influences its air quality. Situated at coordinates 35.4333°N, 133.8167°E, the city occupies a basin surrounded by the Chūgoku Mountains. This topography, while picturesque, creates a natural bowl effect, potentially trapping pollutants during periods of stagnant air. The Hino River flows through Kurayoshi, offering some natural ventilation but also contributing to humidity which can affect pollutant dispersion. The surrounding landscape is predominantly rural, characterized by agricultural lands – particularly fruit orchards and rice paddies – and forested slopes. While not a major industrial hub, Kurayoshi benefits from regional manufacturing and processing activities, contributing to localized emissions. The urban-rural gradient is relatively sharp; the city centre is compact, quickly transitioning to agricultural and mountainous terrain. Elevation varies within the city limits, influencing localized wind patterns. The proximity to the Sea of Japan introduces maritime influences, including moisture and occasional sea breezes, but the mountains largely shield the city from direct coastal winds. This combination of basin topography, agricultural practices, and limited industrial activity shapes Kurayoshi’s air quality profile, making it susceptible to localized pollution events.

Kurayoshi’s air quality follows a distinct seasonal pattern, largely dictated by meteorological conditions. Spring (March-May) often sees increased particulate matter from agricultural burning as farmers prepare fields for planting, coupled with pollen from flowering trees. Winds are variable, sometimes leading to pollutant accumulation in the basin. Summer (June-August) brings the humid rainy season, which generally improves air quality through rainfall scavenging pollutants. However, high humidity can also promote secondary pollutant formation. Autumn (September-November) is typically the clearest period, with stable high-pressure systems bringing dry, sunny weather and good ventilation. However, temperature inversions can occur, trapping pollutants near the ground. Winter (December-February) presents the most challenging conditions. Cold, dry air from Siberia descends, often becoming trapped by the surrounding mountains, leading to stagnant air and increased concentrations of particulate matter and other pollutants. Sensitive individuals, including those with respiratory conditions and the elderly, should limit strenuous outdoor activity during these winter months. Fog is also common, exacerbating pollution. Months to favour for outdoor activity are September-October, offering the best balance of clear skies and moderate temperatures.