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Atsugichō, nestled within Kanagawa Prefecture, Japan, occupies a strategic yet complex geographical position. Situated at coordinates 35.4333°N, 139.3667°E, the city benefits from relative proximity to Tokyo, forming part of the Greater Tokyo Area, one of the world’s most densely populated metropolitan regions. The terrain is characterized by gently undulating hills, a legacy of volcanic activity, transitioning into flatter areas closer to the Sagami River which forms a natural boundary to the west. This riverine influence, while providing a vital water resource, also contributes to humidity and potential for temperature inversions. Atsugichō isn’t heavily dominated by agriculture, but pockets of farmland exist in the surrounding areas, contributing to seasonal biomass burning. Historically, the area saw industrial development, particularly related to manufacturing, and remnants of these industrial zones still impact local air quality. The urban-rural gradient is noticeable, with denser residential and commercial areas concentrated around Atsugi Station, gradually giving way to more forested hillsides further from the city centre. This topography influences wind patterns, creating localized areas of stagnant air, particularly during calm weather conditions, exacerbating pollutant concentrations. The city’s location within a basin further compounds this effect, trapping emissions and hindering dispersion.

Atsugichō’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees increased particulate matter from *kaizuka yaki* – traditional agricultural burning practices clearing fields after winter, coupled with pollen from cedar and cypress trees, impacting respiratory health. Summer (June-August) brings the humid monsoon season, which can temporarily cleanse the air through rainfall, but also fosters mold growth and high humidity, aggravating asthma. However, stagnant air and high temperatures can trap ozone precursors. Autumn (September-November) is generally the period of clearest air, with cooler temperatures and stronger winds aiding dispersion. However, increased heating demand towards November can lead to a rise in particulate matter from wood and fossil fuel combustion. Winter (December-February) presents the most challenging conditions. Temperature inversions are frequent, trapping pollutants emitted from residential heating and regional industrial sources. Dry, cold air also reduces the atmosphere’s capacity to dilute emissions. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during winter mornings and periods of calm weather. Monitoring air quality forecasts is crucial, particularly during these peak pollution seasons.