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Sampit is a strategic port city nestled in the heart of Central Kalimantan, serving as a vital economic gateway for the province. Positioned along the banks of the Mentaya River, the city’s urban character is defined by its linear development following the river’s course toward the Java Sea. The terrain is predominantly low-lying coastal plain, characterized by an intricate network of waterways and vast, carbon-rich peatland forests that envelop the urban periphery. This specific geography plays a critical role in the city's air quality dynamics. Being situated in a basin of organic soil, Sampit is uniquely susceptible to the effects of subterranean peat fires, which can smolder for weeks and release immense quantities of particulate matter. The urban-rural gradient is sharp, transitioning quickly from the commercial center to expansive oil palm plantations and rubber estates. These agricultural zones, while economically driving, contribute to land-use changes that alter local microclimates and increase vulnerability to burning. The proximity to the coast introduces saline breezes that occasionally flush the city with fresh air, yet during stagnant periods, the humid tropical air traps pollutants close to the ground. The elevation is minimal, meaning there are few natural topographic barriers to block incoming smoke plumes from neighboring districts during the burning season. Consequently, the intersection of its riverine logistics, its industrial processing belts, and its surrounding peatland ecology makes Sampit a focal point for studying the interplay between land management and atmospheric health in Borneo, where climate change further intensifies these cyclical smog events.

Sampit’s air quality is dictated by a binary tropical cycle of wet and dry seasons, rather than four distinct temperate quarters. The wet season, typically spanning from November to March, brings heavy monsoonal rains that act as a natural atmospheric scrubber. During these months, precipitation washes particulate matter from the sky and keeps the surrounding peatlands saturated, effectively preventing the ignition of organic soils. This is the optimal window for outdoor activities and the period when air quality is at its cleanest. Conversely, the dry season, peaking between June and September, introduces a period of severe vulnerability. As the water table drops, the peatlands dry out, becoming highly flammable. This period often coincides with the South East Monsoon, which can transport smoke plumes from distant agricultural clearings directly into the city. Temperature inversions during the early morning often trap this thick, acrid haze near the surface, leading to dangerous spikes in particulate matter. For sensitive groups, including children, the elderly, and those with respiratory conditions, these months are critical; the use of N95 masks and indoor air purifiers is strongly advised. Avoiding outdoor exertion during the hazy peaks of August is essential to prevent acute respiratory distress. The transition months of April and May often see erratic weather, where intermittent rains provide temporary relief but fail to fully quench the subterranean embers, keeping the atmospheric risk moderately elevated until the monsoon returns in full force to cleanse the hazy urban skies.