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Capul, nestled in the province of Northern Samar, Philippines, occupies a unique geographical position as an island municipality. Located at 12.4230°N, 124.1820°E, the island is part of the Samar Sea, a significant body of water influencing its climate and air quality. The terrain is predominantly rolling hills, rising to modest elevations, with a coastline characterized by rocky shores and small beaches. Capul’s urban character is distinctly rural, with a population of 12,323, concentrated in several barangays. The surrounding landscape is largely agricultural, dominated by coconut plantations, rice paddies, and small-scale farming. Unlike larger Philippine cities, Capul lacks significant industrial belts, which is a positive factor for baseline air quality. However, the island’s reliance on marine transport and local fishing boats contributes to particulate matter emissions. The urban-rural gradient is sharp; outside the poblacion, the island quickly transitions to agricultural land and coastal ecosystems. Proximity to the open sea generally promotes good ventilation, but localized wind patterns can trap pollutants during calm periods. The island’s small size means pollution sources have a relatively widespread impact, and prevailing winds from the northeast during the wet season can carry pollutants from mainland Samar.

Capul experiences a pronounced wet and dry season, dictating the patterns of air quality. The dry season, typically from March to May, sees a peak in particulate matter due to increased dust from agricultural activities, road traffic (though limited), and potential open burning for land preparation. Lower rainfall means less atmospheric cleansing. Winds during this period are generally lighter and more variable, increasing the risk of localized pollution build-up. The onset of the wet season in June brings relief, with frequent rainfall effectively washing pollutants from the air. However, the northeast monsoon, dominant from November to February, can bring increased humidity and potentially trap pollutants near the coast, especially during periods of calm. Fog is infrequent but can occur during the cooler months, exacerbating particulate matter concentrations. Outdoor activity is generally most favourable during the peak of the wet season (July-September) when rainfall is consistent and winds are stronger. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season and be mindful of potential smoke from agricultural fires. Monitoring wind direction during monsoon shifts is also advisable.