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Cabugao, Ilocos Sur, Philippines, occupies a strategically important coastal position on the western edge of the province, facing the South China Sea. Its coordinates (17.7947° N, 120.4556° E) place it within a gently sloping coastal plain, transitioning inland to rolling hills and eventually the Cordillera Central mountain range to the east. The municipality’s terrain is predominantly agricultural, characterized by rice paddies and small-scale farms that extend towards the interior. The proximity to the sea significantly influences local weather patterns and, consequently, air quality. Prevailing winds often originate over the ocean, carrying moisture and potentially marine aerosols. The surrounding landscape is a mix of agricultural fields, coconut plantations, and scattered settlements, creating a gradual urban-rural gradient. While Cabugao itself is a relatively small municipality, it serves as a vital trading hub for the surrounding agricultural communities. There are no major industrial belts directly within Cabugao; however, larger industrial areas are located further south in Ilocos Norte. The elevation is relatively low, generally below 50 meters above sea level, which can exacerbate the trapping of pollutants during periods of temperature inversion, particularly during the cooler months. The coastal location also means the city is susceptible to salt spray, which can contribute to particulate matter in the air, especially during windy conditions. The overall geographic setting presents a unique interplay of agricultural activity, coastal influences, and topography that shapes Cabugao’s air quality profile.

Cabugao’s tropical climate dictates a wet and dry season pattern, significantly impacting air quality throughout the year. The dry season, typically from November to May, often sees a slight improvement in air quality due to reduced rainfall and less agricultural burning. However, this period can also experience temperature inversions, particularly in December and January, where cooler air becomes trapped near the ground, preventing pollutants from dispersing. This can lead to localized increases in particulate matter. The wet season, from June to October, brings frequent rainfall and higher humidity. While rain naturally helps to cleanse the atmosphere by washing away pollutants, the increased agricultural activity during the wet season, including fertilizer application and occasional controlled burns for land preparation, can temporarily elevate levels of ammonia and particulate matter. Monsoon winds, prevalent during the latter part of the wet season, can bring in moisture and pollutants from surrounding areas. Fog, a relatively infrequent occurrence, can also trap pollutants, leading to reduced visibility and potentially poorer air quality. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be mindful of potential air quality fluctuations, especially during temperature inversion events in the dry season and periods of agricultural burning in the wet season. Outdoor activities are generally more favorable during the drier months, but vigilance is still advised, particularly during early morning hours when inversions are most likely. The interplay of rainfall, wind patterns, and temperature variations creates a dynamic air quality environment in Cabugao.