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Buguey, a municipality nestled in the province of Cagayan, Philippines, occupies a strategically important coastal position along the Babuyan Channel. Its coordinates, 18.2882° N, 121.8331° E, place it within a predominantly flat, alluvial plain formed by the Cagayan River system. The terrain is generally low-lying, with elevations rarely exceeding 10 meters above sea level, making it susceptible to flooding during heavy rainfall events. The municipality is bordered to the west by agricultural lands, primarily rice paddies and cornfields, which contribute to seasonal dust and biomass burning emissions. To the east lies the expansive Babuyan Channel, a significant waterway influencing local wind patterns and maritime transport. The urban character of Buguey is characterized by a gradual urban–rural gradient, with a concentrated commercial and residential area around the town proper transitioning into dispersed settlements and agricultural zones further inland. The proximity to the Cagayan River, a major artery for regional trade and agriculture, means that riverine transport contributes to localized particulate matter. While Buguey lacks large-scale industrial zones within its immediate boundaries, it benefits from its position within the broader Cagayan Valley region, which experiences agricultural processing activities. The surrounding landscape is dominated by rice fields, interspersed with coconut plantations and small-scale farms, creating a unique blend of agricultural and coastal environments that significantly shapes its air quality profile. The relatively flat topography can exacerbate the accumulation of pollutants, particularly during periods of stagnant air.

Buguey’s tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality. The dry season, typically spanning from November to May, often sees a gradual increase in particulate matter. Agricultural burning, a common practice for land clearing and residue disposal, becomes more prevalent during this period, releasing significant amounts of smoke and ash into the atmosphere. Wind patterns during the dry season can be variable, sometimes leading to stagnant air conditions, particularly in the evenings, which allows pollutants to accumulate. The onset of the wet season, from June to October, brings relief as monsoon rains wash away accumulated particulate matter and reduce agricultural burning. However, heavy rainfall can also lead to increased humidity and the potential for mold and fungal spores to become airborne, impacting respiratory health. Fog, a relatively infrequent occurrence, can trap pollutants near the ground, creating localized pockets of poor air quality. Temperature inversions, though not as common as in temperate climates, can occasionally occur, further hindering vertical mixing and trapping pollutants. The months of March to April, coinciding with peak agricultural burning, are generally the least favorable for outdoor activities, especially for individuals with respiratory conditions like asthma. During the wet season, particularly during periods of intense rainfall, those with allergies should be mindful of potential mold exposure. Maintaining good ventilation indoors and avoiding prolonged exposure to smoke from agricultural fires are crucial preventative measures throughout the year, with heightened vigilance during the dry season.