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Belison, Antique, Philippines, nestled on the western coast of Panay Island, presents a unique geographic profile significantly influencing its air quality. Located at approximately 10.8381° N, 121.9606° E, the municipality sits within a gently sloping coastal plain, transitioning to slightly elevated terrain inland. Its proximity to the Sulu Sea dictates a maritime climate, characterized by high humidity and frequent sea breezes. The surrounding landscape is predominantly rural, comprising rice paddies, coconut plantations, and small-scale agricultural plots – a typical feature of Antique’s agrarian economy. This rural setting generally limits large-scale industrial emissions, however, agricultural burning during land preparation periods can contribute to localized particulate matter. Belison’s elevation, relatively low at around 10-30 meters above sea level, minimizes the potential for significant temperature inversions, a phenomenon that can trap pollutants. The urban–rural gradient is gradual; Belison itself is a small, primarily residential municipality with limited commercial activity, meaning that major pollution sources are unlikely to be within the city limits. The prevailing winds, generally from the southwest during the wet season and shifting to the northeast during the dry season, play a crucial role in dispersing or concentrating any pollutants generated locally or transported from further afield. The coastal location also means Belison is susceptible to salt spray, which can exacerbate respiratory issues for sensitive individuals.

Belison’s tropical climate dictates a distinct wet and dry season, profoundly impacting its air quality patterns. The wet season, typically spanning from June to November, brings frequent rainfall and high humidity. While the rain naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can exacerbate respiratory problems for those with pre-existing conditions. The southwest monsoon (Habagat) dominates this period, bringing consistent winds that generally disperse pollutants, reducing the likelihood of stagnant air and localized pollution events. Conversely, the dry season (December to May) presents a different set of challenges. Reduced rainfall means fewer opportunities for atmospheric cleansing. While winds remain present, they are often lighter and more variable, potentially leading to periods of stagnant air, particularly during calmer weather systems. Agricultural burning, a common practice in Antique to clear land for planting, is most prevalent during the transition from the wet to dry season (February-March), significantly increasing particulate matter concentrations. Fog, though infrequent, can occasionally form during the cooler months (December-January), trapping pollutants near the ground. Sensitive groups, including children, the elderly, and individuals with respiratory illnesses, should exercise caution during periods of agricultural burning and when fog is present, limiting outdoor activity and ensuring adequate ventilation. The generally humid climate necessitates careful management of indoor air quality, particularly in homes with cooking fires.