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Santa, Ilocos Sur, is a coastal municipality nestled along the western coastline of Luzon Island in the Philippines. Situated at 17.4860°N, 120.4344°E, the town’s geography is defined by a relatively flat terrain transitioning from the coastal plains to gently rolling hills inland. The South China Sea directly influences Santa’s climate and air quality, providing both moderating breezes and potential sources of marine aerosols. The town’s population of approximately 14,992 is concentrated in the *poblacion* and scattered barangays along the coast and inland. Agriculture dominates the surrounding landscape, primarily rice paddies and small-scale farming, with some fishing activity. While Santa isn’t a major industrial hub, regional transport routes pass through, contributing to localised vehicle emissions. The urban-rural gradient is pronounced; the *poblacion* exhibits denser development, while outlying areas remain largely agricultural. This proximity to agricultural lands can introduce dust and particulate matter into the air, particularly during dry seasons and harvest times. The prevailing winds, generally from the southwest during the wet season and northeast during the dry season, play a crucial role in dispersing or concentrating pollutants. The coastal location means Santa is also susceptible to salt spray, which can affect corrosion and potentially contribute to aerosol formation.

Santa, Ilocos Sur, experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from November to May, sees a build-up of particulate matter from agricultural activities like land preparation and harvesting. Northeast monsoon winds, while generally dispersing pollutants, can also carry dust from inland areas. February and March often experience the clearest skies, making them ideal for outdoor activities. The wet season, from June to October, brings relief from particulate matter as rainfall effectively washes pollutants from the air. However, increased humidity can foster mould growth, impacting respiratory health. The southwest monsoon, bringing heavy rainfall, can also lead to localised flooding, potentially releasing contaminants from agricultural runoff. September and October, during the peak of the monsoon, may see reduced visibility and increased dampness. Temperature inversions, though less frequent than in larger urban centres, can occur during calmer periods, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during peak dry season months and periods of high humidity. Monitoring weather patterns and avoiding outdoor exertion during these times is advisable.