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Bingawan, a municipality nestled in the province of Iloilo, Philippines (11.2300°N, 122.5700°E), presents a unique geographic setting influencing its air quality. Situated inland, Bingawan is characterized by a rolling, hilly terrain typical of the central Iloilo landscape. The municipality isn’t directly coastal, lying approximately 20-30 kilometers from the Visayan Sea, but is heavily influenced by the regional climate patterns originating over the water. The surrounding areas are predominantly agricultural, with rice paddies and small-scale farming dominating the land use. While not a major industrial hub, the increasing presence of small-scale agricultural processing and the transport of produce contribute to localized emissions. The urban-rural gradient is pronounced; Bingawan’s poblacion represents the most concentrated area, while the majority of the municipality remains rural. This impacts air dispersion, as pollutants in the poblacion have limited space to dissipate. The elevation, while not extreme, contributes to temperature variations and potential for localized inversions, trapping pollutants near the ground. The terrain also affects wind patterns, creating pockets of stagnant air. The municipality’s position within a broader agricultural region means it’s susceptible to seasonal burning practices, a significant contributor to particulate matter.

Bingawan experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from March to May, sees a peak in particulate matter due to agricultural burning for land preparation and increased dust from unpaved roads. Lower humidity and stable atmospheric conditions exacerbate pollution, making these months less favourable for outdoor activities, particularly for those with respiratory conditions. The onset of the wet season in June brings relief, with rainfall effectively washing away pollutants and suppressing dust. However, increased humidity can also foster mold growth, impacting indoor air quality. July to September often experiences the strongest monsoon winds, which, while generally dispersing pollutants, can also transport them from surrounding areas. October to November sees a transitional period with fluctuating rainfall and moderate air quality. December to February are generally the most pleasant months, with cooler temperatures and relatively clean air, though localized emissions from household cooking and transport remain a concern. Sensitive groups – children, the elderly, and those with pre-existing respiratory illnesses – should exercise caution during the dry season and monitor their health closely.