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Bucay, nestled within the province of Abra in the Philippines, occupies a geographically significant position within the Cordillera Central mountain range. Located at approximately 17.54° N, 120.72° E and an elevation of around 1,400 meters (4,593 feet) above sea level, the city’s terrain is characterized by steep slopes, valleys, and rolling hills. This mountainous landscape significantly influences local air circulation patterns. Bucay sits within a predominantly rural setting, surrounded by agricultural lands primarily dedicated to rice and vegetable farming, interspersed with pockets of pine forests on the higher slopes. The surrounding landscape is a mosaic of cultivated fields and natural vegetation, creating a distinct urban–rural gradient. While Bucay itself is a small municipality, its regional position places it within reach of larger agricultural zones in Abra and neighbouring provinces, potentially impacting air quality through agricultural practices like burning of crop residue, though this is generally limited in scale. The city’s proximity to the mountains creates a natural barrier, sometimes trapping pollutants and leading to localized inversions, particularly during cooler months. The lack of major industrial activity within Bucay itself means that pollution sources are primarily related to residential heating (using wood or charcoal), agricultural activities, and vehicle emissions from the limited transportation network. The prevailing winds, generally flowing from the northeast during the wet season, play a crucial role in dispersing or concentrating pollutants, depending on their direction and strength relative to the topography.

Bucay’s tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality. The wet season, typically spanning from June to November, brings frequent rainfall and increased humidity. While the rain naturally helps to cleanse the atmosphere by removing particulate matter, the increased cloud cover can also lead to reduced solar radiation, potentially hindering the breakdown of some pollutants. The monsoon winds from the northeast during this period generally provide good ventilation, dispersing any localized emissions. Conversely, the dry season (December to May) presents a different scenario. Lower rainfall means less natural cleansing, and the cooler temperatures, especially during December and January, can contribute to temperature inversions. These inversions trap cooler air near the ground, preventing the vertical mixing of pollutants and leading to their concentration. Fog, common during the cooler months, further exacerbates this effect by reducing visibility and trapping pollutants. Agricultural burning, though regulated, may still occur during the dry season to clear fields for planting, adding to particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of fog or temperature inversions. Outdoor activities are generally more favourable during the wet season when rainfall is frequent and ventilation is improved. The transition months of May and November represent periods of shifting weather patterns, with air quality fluctuating accordingly. Careful monitoring of local conditions is always advisable.