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Pangkalan Bun serves as a critical administrative and economic hub within the Kotawaringin Barat Regency of Central Kalimantan. Situated on a low-lying coastal plain, the city is defined by its intimate relationship with the Arut River, which carves through the landscape and facilitates regional trade. The surrounding terrain is predominantly flat, characterized by vast expanses of tropical peatland and dense rainforests that transition into expansive oil palm plantations. This specific geographic configuration creates a unique atmospheric environment where the urban-rural gradient is blurred by encroaching greenery and agricultural zones. Because the city sits at a very low elevation near the Java Sea, it experiences high humidity and often stagnant air masses. The presence of extensive peat soils is the most significant factor influencing local air quality; these organic-rich lands are highly combustible during dry periods. When fires ignite in the surrounding peat domes, the flat terrain allows smoke to settle and linger over the urban center, as there are no significant topographical barriers to force vertical air movement. Consequently, the city often becomes a basin for particulate matter, particularly during the transition between seasons. The proximity to the coast provides occasional maritime breezes that can clear the air, but these are frequently countered by the sheer volume of smoke generated from the hinterlands, making the city's air quality inextricably linked to the health of its surrounding peatland ecosystems and the strategic management of regional land-use practices.

Pangkalan Bun operates under a tropical rainforest climate, characterized by two primary seasons: the wet and the dry. During the wet season, typically spanning from October to April, heavy monsoonal rains act as a natural scrubbing mechanism, washing particulate matter from the atmosphere and keeping the air fresh. This period is the most favorable for outdoor activities, as high precipitation prevents the ignition of peatlands and maintains low pollution levels. However, as the region transitions into the dry season, usually from May to September, the meteorological dynamic shifts. Rising temperatures and decreasing rainfall lead to the desiccation of peat soils, creating a volatile environment prone to subterranean fires. These fires release massive quantities of carbonaceous smoke and fine particulates, which often linger due to temperature inversions and low wind speeds. The peak of the haze season typically occurs between August and October, when smoke from local and regional fires blankets the city in a thick, acrid smog. For sensitive groups, including children, the elderly, and those with respiratory conditions, this period is hazardous. It is strongly advised to limit outdoor exertion and utilize air filtration systems during these months. Health guidance emphasizes the use of N95 masks to filter out fine particulate matter (PM2.5) that penetrates deep into the lungs. Monitoring local wind patterns is essential, as a shift toward maritime breezes can provide temporary respite, but the overarching seasonal trend remains driven by the peat fire cycle each year.