Kumano Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Kumano, nestled within Hiroshima Prefecture, Japan, presents a fascinating case study in the interplay of geography and air quality. Located at coordinates 34.3358, 132.5847, the city occupies a valley floor, characteristic of much of Hiroshima’s terrain. This positioning, while offering protection from some weather systems, also predisposes it to air stagnation. The surrounding landscape is dominated by forested hills and mountains, typical of the Chūgoku region, creating a complex topography that influences wind patterns. Kumano is approximately 20km inland from the Seto Inland Sea, meaning direct marine influences on air dispersal are moderated. While not a major industrial hub itself, Kumano’s proximity to larger industrial areas within Hiroshima Prefecture, particularly around the coastal cities, means it can experience transboundary pollution. The city’s population of around 22,760 suggests a relatively low-intensity urban footprint, with a noticeable urban-rural gradient as one moves away from the central area. Agricultural land surrounds much of the city, contributing to seasonal biomass burning which can impact local air quality. The valley location, combined with potential temperature inversions common in such terrain, can trap pollutants, especially during calmer weather conditions. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Kumano.

Kumano’s air quality follows a distinct seasonal pattern, heavily influenced by prevailing meteorological conditions. Spring (March-May) often sees increased particulate matter from agricultural burning as farmers prepare fields, coupled with pollen from local vegetation. Winds are typically variable, offering some dispersal, but temperature inversions can occur, trapping pollutants in the valley. Summer (June-August) brings the humid subtropical climate of Hiroshima, with the rainy season initially offering some cleansing effect. However, stagnant air and high humidity can exacerbate ozone formation during periods of intense sunlight. Autumn (September-November) is generally the period of best air quality, with cooler temperatures, increased wind speeds, and reduced agricultural activity. However, occasional incursions of air pollution from East Asia can occur. Winter (December-February) presents the most challenging conditions. Cold, dry air masses from Siberia contribute to increased concentrations of particulate matter, and temperature inversions are frequent, trapping pollutants close to the ground. Sensitive groups – the elderly, children, and those with respiratory conditions – should limit strenuous outdoor activity during winter months and periods of stagnant air. Monitoring wind direction and avoiding activity near agricultural areas during burning seasons are also advisable.