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Bayugan City, nestled in the province of Agusan del Sur, Philippines, occupies a strategically important position within the Caraga region. Located at approximately 8.71° N, 125.75° E, the city’s geography is defined by a gently sloping terrain transitioning from the foothills of the Diwata Range to the expansive Agusan River floodplain. This river, a vital artery for the region, significantly influences the local climate and potential for humidity-related air quality concerns. Bayugan’s elevation averages around 150 meters above sea level, contributing to a relatively mild climate but also limiting dispersion of pollutants trapped within the basin. The surrounding landscape is a mosaic of agricultural lands – primarily rice paddies and coconut plantations – interspersed with secondary forests and small-scale mining operations, particularly for gold. This agricultural activity, while crucial for the local economy, can contribute to particulate matter pollution, especially during harvesting and land preparation. The urban–rural gradient is gradual, with smaller barangays blending seamlessly into agricultural areas. The city itself exhibits a developing urban character, with a central commercial district and expanding residential zones. Proximity to the Agusan River also means potential for localized flooding, which can resuspend sediments and worsen air quality. The prevailing winds, generally easterly, play a role in dispersing pollutants, but the basin topography can sometimes impede this process, leading to localized air quality issues. The region's geological composition, with underlying sedimentary rocks, can also influence dust generation.

Bayugan’s tropical climate dictates a distinct wet and dry season, profoundly impacting air quality patterns. The dry season, typically spanning from March to May, often sees a slight increase in particulate matter concentrations. This is largely attributable to increased agricultural burning for land clearing and crop residue disposal, a common practice in the region. While temperatures are generally high, the lack of significant rainfall during this period allows dust and smoke to linger. The wet season, from June to November, brings frequent rainfall and higher humidity, generally leading to improved air quality as pollutants are washed from the atmosphere. However, periods of intense rainfall can also lead to flooding, which, as mentioned, can resuspend particulate matter. The monsoon season, particularly in October and November, can bring prolonged periods of rain and reduced wind speeds, potentially trapping pollutants near the ground. Fog, though infrequent, can also occur, especially during the transition months, further hindering dispersion. During the dry season, sensitive groups like children, the elderly, and individuals with respiratory conditions should limit prolonged outdoor activity, particularly during periods of agricultural burning. The wet season generally offers more favourable conditions, but vigilance is still advised during flood events. The interplay of these seasonal factors creates a dynamic air quality profile, requiring ongoing monitoring and targeted mitigation strategies to protect public health. The reduced wind speeds during the wet season can also exacerbate the impact of any localized pollution sources.