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Baliangao, nestled along the western coast of Misamis Occidental in the Philippines, occupies a geographically significant position within the broader Mindanao region. Its coordinates (8.6700, 123.6000) place it on a gently sloping coastal plain, transitioning rapidly to the rugged, forested slopes of the Malaybalay Range. This range acts as a partial barrier, influencing prevailing wind patterns and potentially trapping pollutants under certain meteorological conditions. The municipality borders the expansive Balangiga Bay, a vital fishing ground and a source of livelihood for many residents. The surrounding landscape is predominantly rural, characterized by small-scale agriculture – rice paddies, coconut plantations, and fruit orchards – interspersed with pockets of secondary forest. The urban–rural gradient is gradual; Baliangao itself is a small, dispersed settlement, lacking a concentrated urban core. There are no major industrial belts directly adjacent to Baliangao, minimizing direct industrial emissions. However, agricultural practices, particularly the burning of crop residues after harvest, can contribute to localized air pollution events. The elevation varies from near sea level along the coast to several hundred meters inland, impacting temperature and humidity profiles, which in turn influence atmospheric stability and pollutant dispersion. The proximity to the sea introduces a maritime influence, moderating temperatures and increasing humidity, but also potentially bringing in salt aerosols and marine-derived particulate matter. The terrain’s complexity, combined with the agricultural activity, creates a unique microclimate affecting air quality.

Baliangao’s tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality profile. The dry season, typically spanning from March to May, often sees a slight increase in particulate matter due to agricultural burning. Farmers clearing fields after the harvest season utilize controlled burns, releasing smoke and ash into the atmosphere. While these burns are often localized, prevailing winds can carry the pollutants over a wider area, particularly during periods of low wind speed. The wet season, from June to November, brings frequent rainfall and increased humidity, generally leading to improved air quality as precipitation washes away particulate matter. However, intense storms can stir up dust and debris, temporarily degrading air quality. During the transition months (December and February), fog can form in the mornings, trapping pollutants near the ground and creating localized pockets of reduced visibility and potentially elevated concentrations of certain pollutants. Temperature inversions, where cooler air is trapped beneath warmer air, are less frequent but can occur, particularly during the cooler months, hindering vertical mixing and exacerbating pollution. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, especially on days with visible smoke or haze. Outdoor activities are generally more favorable during the wet season, although sudden downpours can impact visibility and safety. The maritime influence helps to dilute pollutants, but periods of calm winds can lead to stagnation and localized air quality concerns.