Bilar Air Quality Index (AQI)

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Bilar, Bohol, nestled on the island of Bohol in the Philippines, occupies a geographically significant position within the Visayas region. Located at approximately 9.7°N, 124.1°E, the municipality sits within a predominantly rural landscape characterized by undulating hills and valleys, a direct consequence of the island’s karst topography. The terrain is largely agricultural, with extensive rice paddies and coconut plantations dominating the surrounding areas, gradually transitioning to forested slopes as elevation increases. Bilar’s elevation ranges from around 50 meters near the coastal fringes to over 400 meters in the interior, influencing local microclimates and air circulation patterns. The municipality is not directly adjacent to a major body of water, though it benefits from proximity to the Bohol Sea to the east, moderating temperatures and influencing prevailing winds. While Bilar itself lacks significant industrial zones, it’s part of a broader agricultural belt across Bohol, and occasional burning of agricultural waste can contribute to localized air pollution events. The urban–rural gradient is relatively smooth; Bilar is a small, primarily agricultural town with limited urban development, meaning that air quality is generally dictated by natural factors and agricultural practices rather than heavy industrial emissions. The surrounding landscape, a mix of cultivated land and secondary forests, plays a crucial role in filtering pollutants and influencing local air movement, though deforestation can exacerbate issues. The karst landscape also impacts drainage and potential for dust generation during dry periods.

Bilar’s tropical climate dictates a distinct wet and dry season, profoundly impacting air quality. The dry season, typically spanning from November to May, often sees a slight increase in particulate matter due to agricultural burning practices. Farmers clearing fields after harvests frequently employ controlled burns, releasing smoke and ash into the atmosphere. While these burns are often localized, they can contribute to noticeable haze, particularly during periods of calm winds. The wet season, from June to October, brings frequent rainfall and increased humidity, naturally cleansing the air and significantly reducing particulate pollution. Monsoon rains effectively wash away accumulated pollutants, leading to improved air quality during these months. Temperature inversions, though less frequent than in temperate climates, can occasionally occur during the cooler months (December-February), trapping pollutants near the ground, especially in the valleys. Fog, particularly in the higher elevations of Bilar, can also temporarily reduce visibility and concentrate pollutants. The prevailing winds, generally from the east during the wet season and shifting more southerly during the dry season, play a crucial role in dispersing pollutants. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be mindful of potential haze during the dry season and avoid strenuous outdoor activity on days with visible smoke. During the wet season, while air quality is generally good, the increased humidity can still exacerbate respiratory issues for some individuals.