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Santiago, nestled within the province of Agusan del Norte in the Philippines, occupies a relatively low-lying position at approximately 9.2700°N, 125.5600°E. The city’s geography is defined by its location within the Agusan River Basin, a broad alluvial plain formed by the Agusan River, the third-longest river in the Philippines. This flat terrain, typical of the region, facilitates agricultural activity, with rice paddies and coconut plantations dominating the surrounding landscape. Santiago isn’t a major industrial hub, but smaller-scale processing of agricultural products contributes to localised emissions. The urban-rural gradient is quite sharp; the city centre quickly transitions into agricultural lands. Proximity to the river influences humidity and can contribute to localised fog formation, potentially trapping pollutants. The surrounding hills, though not dramatically elevated, can influence wind patterns, creating microclimates. The prevailing winds generally come from the northeast during the wet season and shift to the southeast during the dry season. This geographical setting, while conducive to agriculture, presents challenges for air quality management due to limited natural dispersion of pollutants and the potential for agricultural burning to impact local air.

Santiago experiences a pronounced wet and dry season, dictating the city’s air quality patterns. The dry season, typically from March to May, sees a peak in particulate matter due to increased agricultural activities like land preparation and crop residue burning. Lower rainfall means less atmospheric cleansing, and stable atmospheric conditions can lead to pollutant build-up. Conversely, the wet season, from June to February, generally brings improved air quality. Heavy rainfall effectively washes pollutants from the air, and increased humidity can suppress dust. However, the wet season also brings increased traffic congestion due to flooded roads, potentially increasing vehicle emissions. November to January, during the peak of the northeast monsoon, can experience periods of stagnant air, especially in low-lying areas. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit prolonged outdoor exposure during the dry season, particularly in March and April. During the wet season, while overall air quality is better, caution is advised during periods of heavy traffic. Monitoring local weather patterns is crucial for informed decisions regarding outdoor activities.