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Luuk, situated in the Sulu province of the Philippines at coordinates 5.9676°N, 121.3133°E, is a coastal municipality deeply interwoven with the Sulu Sea. The terrain is predominantly flat, typical of many islands within the Sulu Archipelago, with a low elevation that makes it vulnerable to sea-level rise and storm surges. The town’s urban character is largely defined by its fishing industry and agricultural practices, primarily focused on rice and coconut cultivation in the surrounding areas. Luuk isn’t a major industrial hub, but smaller-scale processing of agricultural goods and fish drying contribute to localised emissions. The surrounding landscape is a mosaic of coastal mangroves, small farms, and scattered residential areas. The urban-rural gradient is relatively sharp, transitioning quickly from the town centre to agricultural lands. This proximity to the sea influences air quality through sea breezes, which can disperse pollutants, but also introduces salt spray and potentially carries pollutants from other islands within the archipelago. The prevailing winds, influenced by the intertropical convergence zone, play a crucial role in pollutant transport. The lack of significant topographical features limits natural ventilation, potentially exacerbating pollution during calm periods. The island setting means pollutants have limited avenues for dispersal, concentrating them locally.

Luuk experiences a tropical rainforest climate, characterized by distinct wet and dry seasons rather than traditional four seasons. Air quality generally deteriorates during the dry season (February to May) due to reduced rainfall, which limits the natural washing of particulate matter from the atmosphere. Increased agricultural burning for land preparation during this period further contributes to elevated levels of pollutants, particularly PM2.5. Calm wind conditions during these months also hinder dispersion. The wet season (June to November), coinciding with the southwest monsoon, typically brings improved air quality as rainfall effectively clears the air. However, intense rainfall can also lead to localised flooding and the spread of waterborne pollutants. December and January represent a transitional period with generally moderate air quality. Temperature inversions, though less frequent than in temperate climates, can occur during calm nights, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit prolonged outdoor activity during the dry season, particularly in agricultural areas. Monitoring wind direction is crucial; winds from neighbouring islands could carry pollutants. The monsoon season offers the most favourable conditions for outdoor activities, but awareness of potential flooding is essential.