Sevilla Air Quality Index (AQI)

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Sevilla, Bohol, a small municipality nestled on the western coast of Bohol Island in the Philippines, occupies a geographically significant position within the Visayas region. Its coordinates (9.7000, 124.0500) place it within a predominantly coastal plain, characterized by gently sloping terrain transitioning to slightly elevated inland areas. The municipality borders the Bohol Sea, influencing local weather patterns and providing a degree of maritime influence on air quality. The surrounding landscape is a mosaic of agricultural land – primarily rice paddies and coconut plantations – interspersed with small pockets of secondary forest. This agricultural activity, while vital to the local economy, contributes to potential sources of particulate matter, particularly during harvesting and land preparation. Sevilla’s urban character is distinctly rural, with a dispersed settlement pattern and limited industrial presence. The urban–rural gradient is gradual, with agricultural lands quickly enveloping the built-up areas. The proximity to Tagbilaran City, Bohol’s provincial capital, introduces a degree of indirect influence, as vehicular traffic and occasional industrial emissions from Tagbilaran can occasionally drift towards Sevilla. Elevation plays a minor role; the generally low-lying terrain limits the potential for significant temperature inversions, though localized fog formation is possible during the cooler months. The prevailing winds, typically from the east during the wet season and shifting towards the southwest during the dry season, dictate the dispersal of any pollutants generated locally or transported from elsewhere on the island. The lack of major industrial belts within the immediate vicinity contributes to a relatively cleaner air quality baseline compared to larger urban centres.

Sevilla’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality. The wet season, typically spanning from June to November, brings frequent rainfall and high humidity. While the rain naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can exacerbate respiratory issues for sensitive individuals. The monsoon winds from the east during this period generally provide good ventilation, dispersing pollutants effectively. Conversely, the dry season (December to May) presents a different set of challenges. Reduced rainfall means less atmospheric cleansing, and the accumulation of dust and agricultural emissions becomes more pronounced. Periods of stagnant air, particularly during the transition months of April and May, can lead to localized build-up of pollutants. Fog formation, though infrequent, can trap pollutants close to the ground, creating temporary pockets of poorer air quality. The months of March, April, and May often experience the highest levels of agricultural activity, including burning of crop residues, which significantly contributes to particulate matter. Sensitive groups, such as children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during these months, limiting strenuous outdoor activities and monitoring for any adverse health effects. During the wet season, while overall air quality tends to be better, the high humidity can still trigger discomfort for those with asthma or allergies. Maintaining indoor air quality through proper ventilation and air purification can be beneficial throughout the year, but especially during periods of agricultural burning.