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Kaga, Ishikawa Prefecture, Japan, occupies a geographically complex position within the Noto Peninsula, a region renowned for its dramatic coastal landscapes and inland valleys. Situated at approximately 36.3028° N, 136.3150° E, the city’s terrain is characterized by a gradual rise from the coastal plains towards the foothills of the Higashiyama Mountains. This elevation, averaging around 150 meters above sea level, influences local wind patterns and contributes to potential temperature inversions, particularly during the colder months. Kaga’s proximity to the Sea of Japan is a defining feature, bringing both moisture and prevailing winds that significantly impact air quality. The surrounding landscape is a mosaic of terraced rice paddies, traditional farmhouses, and small-scale agricultural fields, reflecting a strong rural character that gradually transitions into a more urban setting within the city limits. While Kaga itself isn't a major industrial hub, it lies within a region with some light manufacturing and agricultural processing, and is relatively close to larger industrial zones further south along the coast. The urban–rural gradient is distinct, with the city center exhibiting denser development while the outskirts retain a predominantly agricultural and forested character. The Noto Peninsula’s unique geological formations, including volcanic activity in the past, have also shaped the soil composition and vegetation, indirectly influencing the types of pollutants that may be present in the air. The coastal location also means that sea salt aerosols are a consistent factor in the local atmospheric composition.

Kaga’s air quality experiences a distinct seasonal cycle heavily influenced by its coastal location and regional meteorology. Winter (December-February) presents the most challenging period. Cold air masses moving in from the Asian continent frequently lead to temperature inversions, trapping pollutants close to the ground. These inversions, coupled with reduced sunlight hours and limited wind circulation, result in stagnant air and a build-up of particulate matter. Fog, common during these months, further exacerbates the issue by absorbing pollutants. Spring (March-May) brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated pollutants. However, pollen season can significantly impact air quality, triggering respiratory sensitivities. Summer (June-August) is generally the cleanest period, with strong sea breezes effectively flushing out pollutants. The monsoon season brings frequent rainfall, further cleansing the atmosphere. Autumn (September-November) sees a transitional period, with decreasing temperatures and a return of occasional temperature inversions, though typically less severe than in winter. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor activities on days with persistent fog or calm conditions. During pollen season, wearing masks and monitoring pollen forecasts is advisable. While summer offers the most favourable conditions, even during this period, brief periods of stagnant air can occur, so awareness of local weather patterns remains important.