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San Rafael, Iloilo, nestled on the island of Panay in the Philippines (11.1728°N, 122.8267°E), is a municipality characterized by a gently undulating terrain transitioning from coastal plains to low-lying hills. With a population of approximately 17,795, it’s a largely rural community, though experiencing increasing urbanization. The municipality borders the Jaro and Leganes municipalities, and is part of the larger Iloilo metropolitan area. Its proximity to the Iloilo River, a major waterway flowing into the Guimaras Strait, significantly influences local climate and potential pollutant dispersion. While not heavily industrialized *within* San Rafael itself, the broader Iloilo region contains industrial zones concentrated around Iloilo City, impacting regional air quality. Surrounding San Rafael are extensive agricultural lands, primarily rice paddies and coconut plantations, contributing to seasonal biomass burning. The urban-rural gradient is pronounced; moving inland from the coastal areas, agricultural activity dominates, influencing particulate matter levels. The relatively low elevation (generally below 50 meters) limits natural atmospheric mixing, potentially exacerbating pollution episodes. The prevailing winds, influenced by the surrounding seas and topography, play a crucial role in pollutant transport and dispersion, often channeling airflows along the river valley.

San Rafael, Iloilo experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from March to May, sees a peak in particulate matter due to agricultural practices like land preparation and crop residue burning. Lower rainfall means pollutants aren’t efficiently washed from the atmosphere, and stable atmospheric conditions can lead to localized build-up. This is a period to limit strenuous outdoor activity, particularly for those with respiratory conditions. The onset of the wet season (June-November) brings significant improvement. Monsoon rains effectively cleanse the air, reducing dust and smoke concentrations. However, increased humidity can also promote mold growth, potentially triggering allergic reactions. December to February represents a transition period, with generally pleasant weather and moderate air quality. Temperature inversions, though less frequent than in larger cities, can occur during calmer periods, trapping pollutants near the ground. Strong winds associated with occasional typhoons during the wet season provide excellent air ventilation, but can also stir up dust. Sensitive groups – children, the elderly, and those with pre-existing respiratory illnesses – should monitor conditions and limit exposure during dry season peaks.