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Santa Ana, Pampanga, nestled in the heart of Central Luzon, Philippines, occupies a geographically significant position within a fertile floodplain. Located approximately 15.09° N, 120.77° E, the city sits at a modest elevation of around 15 meters (49 feet) above sea level, contributing to a relatively flat terrain. This low elevation, combined with its position within the Pampanga River basin, makes it susceptible to seasonal flooding, a factor that can influence air quality through the resuspension of particulate matter. The surrounding landscape is predominantly agricultural, characterized by extensive rice paddies and interspersed with smaller farms cultivating various crops. This agricultural activity, while vital to the regional economy, can contribute to localized air pollution through the use of fertilizers, pesticides, and the burning of crop residues, particularly during harvest seasons. To the west lies the expansive Manila Bay, influencing local weather patterns and potentially impacting the dispersion of pollutants. The urban–rural gradient transitions relatively quickly, with the city exhibiting a mix of residential areas, small commercial establishments, and light industrial zones. While not a major industrial hub, Santa Ana benefits from its proximity to larger industrial belts in nearby provinces, which can occasionally contribute to transboundary air pollution events. The city’s location within a densely populated region of the Philippines means it is also affected by regional pollution sources, including vehicle emissions from surrounding urban centers.

Santa Ana’s tropical climate dictates a distinct wet and dry season, profoundly impacting its air quality profile. The dry season, typically spanning November to May, often sees a gradual accumulation of pollutants. Reduced rainfall and lower humidity during these months contribute to a decrease in atmospheric cleansing, allowing particulate matter and gaseous pollutants to persist for longer periods. Temperature inversions, common during the cooler months (December-February), trap pollutants near the ground, exacerbating localized air quality concerns. The prevailing winds during this period are generally light and variable, further hindering pollutant dispersion. Conversely, the wet season (June to October), characterized by the southwest monsoon (Habagat), brings increased rainfall and stronger winds. These conditions effectively ‘wash’ the atmosphere, removing particulate matter and diluting gaseous pollutants, leading to improved air quality. However, intense rainfall events can also lead to flooding, which, as mentioned previously, can resuspend dust and other pollutants. Fog, particularly during the cooler months, can also trap pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of stagnant air or fog. Outdoor activities are generally more favorable during the wet season, although vigilance is still advised during heavy rainfall events due to potential flooding and associated particulate matter.