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Catigbian, nestled on the island of Bohol in the Philippines (9.8300° N, 124.0300° E), presents a unique geographic profile significantly influencing its air quality. The municipality occupies a coastal plain transitioning into gently rolling hills, a typical characteristic of Bohol’s terrain. Its location on the eastern coast of the island exposes it to prevailing winds from the Philippine Sea, a crucial factor in air dispersal. The surrounding landscape is predominantly rural, characterized by extensive rice paddies, coconut plantations, and small-scale agricultural plots – a defining feature of Bohol’s economy. The municipality borders the Can-umantad River, a vital waterway that contributes to the local microclimate and potential humidity levels. While Catigbian itself lacks major industrial zones, it sits within a broader agricultural region of Bohol, meaning agricultural practices, including fertilizer use and occasional burning of crop residue, can contribute to localized air pollutants. The urban–rural gradient is gradual; Catigbian’s population center is relatively small, with a clear transition to agricultural land within a short distance. Elevation varies from near sea level along the coast to approximately 150 meters in the inland hills, influencing local wind patterns and potential for temperature inversions, particularly during cooler months. The island’s porous limestone geology also affects drainage and potential for dust generation during dry periods. The proximity to the Philippine Sea means Catigbian is susceptible to sea breezes and occasional maritime influences on air quality.

Catigbian’s tropical climate dictates a wet and dry season cycle, profoundly impacting air quality patterns. The dry season, typically from March to May, often sees a slight increase in particulate matter due to increased agricultural activity and the potential for controlled burns to clear land for planting. While large-scale burning is regulated, smaller, localized incidents can occur, contributing to temporary air quality degradation. The prevailing easterly winds generally provide good ventilation, dispersing pollutants relatively quickly, but periods of calm can lead to localized stagnation. The wet season, from June to November, brings frequent rainfall and high humidity. This rainfall acts as a natural air cleanser, effectively scrubbing pollutants from the atmosphere, leading to generally improved air quality during these months. However, heavy rainfall can also lead to increased soil erosion and dust generation, particularly on exposed agricultural land. Fog, though infrequent, can occasionally form in the higher elevations surrounding Catigbian, trapping pollutants near the ground. December to February represents a transitional period, with cooler temperatures and occasional light winds. While not as wet as the monsoon season, this period can experience periods of reduced ventilation, potentially leading to temporary increases in localized pollutants. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be mindful of agricultural burning during the dry season and take precautions during periods of reduced air movement, regardless of the season. Outdoor activities are generally favored during the wet season and early morning hours when winds are typically stronger.