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Dimiao, nestled in the heart of Bohol Island, Philippines, presents a unique geographic context influencing its air quality. Situated at coordinates 9.6200, 124.1700, the municipality occupies a gently sloping terrain transitioning from the central Bohol plateau towards the coastline. Its elevation, averaging around 100 meters above sea level, contributes to localized weather patterns. The surrounding landscape is predominantly characterized by agricultural lands – rice paddies and coconut plantations dominate, interspersed with pockets of secondary forests. Dimiao’s proximity to the Bohol Sea, approximately 5 kilometers to the north, introduces maritime influences, including sea breezes that can both disperse and concentrate pollutants. Unlike larger Philippine cities, Dimiao lacks significant industrial belts; however, agricultural practices, particularly the burning of agricultural waste after harvest, represent a key local emission source. The urban-rural gradient is pronounced, with the town proper being relatively small and surrounded by largely rural areas. This means pollution sources are often dispersed, but can become concentrated during specific agricultural activities. The prevailing winds, influenced by the island’s topography and seasonal monsoon patterns, play a crucial role in pollutant transport and dispersion, impacting air quality across the municipality and potentially drawing in pollutants from neighbouring areas.

Dimiao experiences a distinct wet and dry season, profoundly impacting its air quality. The dry season, typically from February to May, sees a noticeable increase in particulate matter due to agricultural burning preparing fields for planting. Lower humidity and stable atmospheric conditions during these months can trap pollutants, leading to reduced air quality. March and April are often the most challenging months for those with respiratory sensitivities. Conversely, the wet season, spanning June to November, brings relief through rainfall which effectively washes away airborne particles. However, increased humidity can also foster mold growth, potentially exacerbating respiratory issues. The southwest monsoon, dominant during this period, brings frequent rainfall and stronger winds, generally improving air quality but also potentially dispersing pollutants from wider areas. December and January represent a transitional period, with generally favourable conditions. Fog can occasionally form during cooler mornings, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season and monitor their health closely. Maintaining good ventilation indoors is crucial year-round, but particularly during periods of agricultural activity.