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Santa Marcela, nestled within the province of Apayao in the Cordillera Administrative Region of the Philippines, presents a unique geographic setting influencing its air quality. The municipality is characterized by a rugged, mountainous terrain, typical of the Cordillera region, with an elevation contributing to cooler temperatures compared to lowland areas. Situated inland, Santa Marcela isn’t directly coastal, but benefits from proximity to the Apayao River and its tributaries, which carve through the landscape. The surrounding area is predominantly agricultural, with rice paddies and small-scale farming dominating the land use. While not an industrial hub, the increasing use of agricultural machinery and potential for biomass burning during land preparation contribute to localised emissions. The urban-rural gradient is pronounced; Santa Marcela’s poblacion represents a concentrated area of activity, while the vast majority of the municipality remains rural and sparsely populated. This dispersed population limits widespread industrial pollution, but localised sources, coupled with the valley topography, can lead to pollutant concentration. The prevailing winds, influenced by the mountainous terrain, play a crucial role in dispersing or trapping pollutants within the valley. The region’s location also means it’s susceptible to transboundary haze from forest fires in neighbouring regions during certain times of the year.

Santa Marcela experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from November to May, sees reduced rainfall and increased dust and particulate matter in the air, exacerbated by agricultural activities like land preparation and potential burning of agricultural waste. February to April are often the driest months, and consequently, periods when respiratory irritation may be higher. The onset of the wet season, around June, brings relief as rainfall washes away pollutants, improving air quality significantly. However, increased humidity can also promote mould growth, impacting indoor air quality. The peak of the rainy season, July to September, often coincides with the southwest monsoon, bringing cleaner air but also potential for flooding which can disrupt sanitation and indirectly affect health. October and November see a transitional period with fluctuating rainfall and a gradual return to drier conditions. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should exercise caution during the dry season, limiting strenuous outdoor activity and considering the use of masks when dust levels are high. Monitoring weather patterns and avoiding outdoor exertion during peak dry periods is advisable.