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Betsukai, nestled in eastern Hokkaido, Japan, occupies a unique geographic position significantly influencing its air quality. Located at 43.4000° N, 145.1167° E, the city sits within the Tokachi Plain, a vast, relatively flat agricultural region bordered by the Hidaka Mountains to the west and the Sea of Okhotsk to the east. This placement creates a distinct urban–rural gradient; Betsukai itself is a small, primarily agricultural town, with surrounding farmlands dominating the landscape. The terrain is generally low-lying, with elevations rarely exceeding 100 meters, contributing to potential stagnation of air pollutants under certain meteorological conditions. The nearby Tokachi River flows through the plain, providing a degree of moisture and influencing local weather patterns. While Betsukai isn't directly adjacent to major industrial belts, it's part of a broader agricultural zone, meaning agricultural practices, including fertilizer use and livestock farming, can contribute to localized emissions of ammonia and particulate matter. The proximity to the Sea of Okhotsk introduces a maritime influence, bringing in moisture and occasionally sea salt aerosols. The Hidaka Mountains act as a barrier, potentially trapping pollutants within the plain during periods of low wind. The city’s small size and limited industrial activity mean that the primary sources of air pollution are likely to be related to agricultural activities, residential heating (particularly in winter), and occasional vehicle emissions from the relatively low traffic volume. The expansive, open nature of the Tokachi Plain generally allows for good air dispersion, but specific weather patterns can override this effect.

Betsukai’s air quality follows a distinct seasonal pattern dictated by Hokkaido’s harsh climate. Winter (December-February) presents the most challenging period. Cold temperatures lead to increased residential heating using wood or other biomass fuels, contributing to elevated particulate matter concentrations. Temperature inversions, common during winter nights, trap pollutants near the ground, exacerbating the issue. Fog, frequently occurring due to the proximity to the Sea of Okhotsk, further reduces air dispersion. Spring (March-May) brings a gradual improvement as temperatures rise and heating demand decreases. However, agricultural activities, such as fertilizer application and field preparation, can release ammonia and dust, impacting air quality locally. Summer (June-August) generally offers the best air quality, with warmer temperatures promoting atmospheric mixing and frequent winds dispersing pollutants. However, occasional stagnant high-pressure systems can lead to localized pollution episodes. Autumn (September-November) sees a transition period, with cooler temperatures and the resumption of agricultural activities. The combination of cooler air and agricultural emissions can lead to periods of moderate air quality degradation. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during winter months, limiting outdoor exposure on days with visible haze or fog. During spring and autumn, monitoring local agricultural activity and adjusting outdoor plans accordingly is advisable. The maritime influence generally keeps humidity relatively high, which can sometimes trap pollutants, so awareness of wind direction is important.