Kiyosu Air Quality Index (AQI)

Loading live AQI data...

Loading weather snapshot...

Loading historical AQI trends...

Kiyosu, nestled in Aichi Prefecture, Japan, occupies a strategically important location within the broader Chubu region, a historical and contemporary industrial heartland. Situated approximately 20 kilometers southwest of Nagoya, the prefecture’s capital, Kiyosu benefits from, and is also influenced by, the urban sprawl and economic activity of a major metropolitan area. The city’s terrain is characterized by a gentle slope rising from the flat plains bordering the Kiso River, a vital waterway historically used for transportation and irrigation. This riverine influence moderates local temperatures and contributes to humidity levels. Surrounding Kiyosu are a patchwork of agricultural lands – primarily rice paddies and vegetable farms – and increasingly, suburban residential areas reflecting the city’s growth. The urban–rural gradient is relatively gradual, with pockets of rural character persisting even within the city limits. Kiyosu’s elevation, averaging around 25 meters above sea level, minimizes the potential for significant altitude-related air quality variations. However, its proximity to the industrialized areas of Nagoya and the broader Tokai region means it is susceptible to pollutants transported via prevailing winds. The presence of the Iida-Kiyosu Line, a railway corridor, also contributes to localized particulate matter. The surrounding landscape, a mix of cultivated fields and low hills, doesn't offer significant topographical barriers to pollutant dispersion, making air quality management a continuous challenge, particularly during periods of stagnant weather.

Kiyosu’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological patterns. Spring (March-May) often brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, the season is also marked by the 'yellow dust' phenomenon – transboundary particulate matter originating from the Gobi Desert – which can significantly degrade air quality, particularly in early spring. Summer (June-August), characterized by high humidity and occasional intense rainfall, generally sees cleaner air due to frequent precipitation washing pollutants from the atmosphere. However, periods of stagnant high pressure can lead to localized ozone formation, a secondary pollutant. Autumn (September-November) presents a mixed picture. While cooler temperatures and increased wind speeds can improve air quality, the season often sees a resurgence of particulate matter from agricultural burning in surrounding rural areas. Winter (December-February) is typically the most challenging period. Cold air masses frequently lead to temperature inversions, trapping pollutants near the ground. Fog, common during these months, further exacerbates the problem by reducing atmospheric mixing. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor exposure during winter and early spring, particularly on days with visible haze or fog. Increased ventilation indoors and the use of air purifiers are recommended during these periods. The interplay of these seasonal factors dictates the overall air quality profile of Kiyosu, demanding adaptive mitigation strategies.