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Tanjung Selor, the capital of North Kalimantan (Kalimantan Utara) province in Indonesia, occupies a unique geographical position on the island of Borneo. Situated at coordinates 2.8500°S, 117.3833°E, the city is nestled along the Sesayap River, a crucial waterway connecting it to the Makassar Strait. The terrain is predominantly low-lying coastal plain, with elevations rarely exceeding 50 meters above sea level, making it susceptible to tidal influences and seasonal flooding. Tanjung Selor’s urban character is rapidly evolving from a primarily administrative and trading hub to a more diversified regional center. Surrounding the city is a landscape dominated by dense tropical rainforest, interspersed with agricultural areas – primarily palm oil plantations and small-scale farming. The proximity to these agricultural zones contributes significantly to potential air quality concerns, particularly during land clearing activities. The urban-rural gradient is relatively sharp, with dense settlement concentrated around the riverfront and quickly transitioning to forested areas. This location, coupled with prevailing wind patterns, means pollutants can become trapped during periods of calm weather, impacting local air quality. The city’s development is intrinsically linked to its riverine access and its role as a gateway for trade and resource extraction in the region.

Tanjung Selor experiences a tropical rainforest climate, characterized by high humidity and rainfall throughout the year, rather than distinct seasons. However, broadly defined wet and dry seasons significantly influence air quality. The wet season, typically from October to February, generally sees improved air quality due to rainfall washing away particulate matter. However, increased humidity can also foster mold growth, impacting respiratory health. The drier season, from March to September, is often associated with poorer air quality. This is largely due to increased agricultural burning for land preparation, particularly for palm oil plantations, releasing significant amounts of smoke and particulate matter. Wind patterns during this period, often calmer, can exacerbate the situation, leading to haze events. August and September are typically the months with the poorest air quality. Temperature inversions, common in the mornings, can trap pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these periods. Monitoring wind direction is crucial; winds from the south and southwest often carry smoke from burning areas. Fog can also reduce visibility and contribute to respiratory irritation during the wetter months.