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Ōakashichō, located in Hyogo Prefecture, Japan, occupies a strategic position within the Kansai region, approximately 30 kilometers west of Osaka and 40 kilometers northeast of Kobe. Situated at coordinates 34.6500°N, 135.0000°E, this urban area lies in the eastern part of Hyogo, characterized by a transition from the Osaka Plain to the Rokko Mountain range to the south. The terrain is predominantly flat to gently rolling, with an average elevation around 10-20 meters above sea level, facilitating urban sprawl and transportation networks. Proximity to Osaka Bay, about 15 kilometers to the southeast, influences local microclimates, often bringing maritime air that can mix with pollutants. Ōakashichō is embedded in the Keihanshin Industrial Zone, a major economic corridor stretching from Osaka to Kobe, which includes manufacturing, logistics, and residential developments, contributing to general urban pollution sources. The urban-rural gradient shows dense settlement in Ōakashichō itself, blending into suburban and agricultural zones westward toward the Tamba region, where rice paddies and forests may offer some air quality respite. This location, nestled between industrial hubs and natural barriers like mountains, can trap pollutants under certain weather conditions, exacerbating air quality issues, particularly from vehicle emissions and industrial activities common in the area.

In Ōakashichō, air quality fluctuates seasonally due to meteorological patterns and urban activities. Winter, from December to February, often sees the worst pollution, as temperature inversions form over the flat terrain, trapping pollutants near the ground, compounded by increased heating emissions and calm winds. Sensitive groups, such as those with respiratory conditions, should limit outdoor exertion during these months, especially on cold, still days. Spring, from March to May, brings improvement with stronger winds and the arrival of the plum rains, which help disperse pollutants, though pollen from local flora can aggravate allergies. Summer, from June to August, experiences monsoon rains from the East Asian rainy season, typically in June and July, which wash out particulate matter, leading to cleaner air; however, high humidity and heat can increase ozone formation on sunny days, so midday outdoor activities are best avoided. Autumn, from September to November, offers the most favorable conditions, with crisp air, moderate temperatures, and prevailing winds from the northwest, reducing pollution buildup. Throughout the year, weather hazards like fog are minimal, but occasional smog events may occur during peak pollution periods, advising residents to monitor local air quality reports and plan outdoor activities accordingly, favoring early mornings or evenings in warmer seasons.