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San Jacinto de Buena Fe, nestled in the Los Ríos province of Ecuador, occupies a geographically significant position within the Andean foothills, approximately 60 kilometers southeast of the provincial capital, Babahoyo. Its coordinates, -0.8986, -79.4889, place it within a region characterized by a gradual transition from the lowlands of the Ecuadorian Amazon basin towards the higher elevations of the Andes. The city sits at an elevation of roughly 550 meters (1800 feet) above sea level, influencing both temperature and precipitation patterns. The surrounding landscape is a mosaic of small-scale agriculture, primarily focused on plantain, banana, and rice cultivation, interspersed with patches of secondary forest. The Río Quijano, a tributary of the larger Río Napo, flows nearby, providing a crucial water source and impacting local humidity. The urban fabric of San Jacinto de Buena Fe is relatively compact, exhibiting a typical Ecuadorian town layout with a central plaza and radiating streets. The urban–rural gradient is quite sharp; the city quickly gives way to agricultural lands and forested areas. This proximity to agricultural zones means that seasonal burning practices, common for land clearing and crop residue disposal, can significantly impact air quality. Furthermore, while not directly adjacent to major industrial belts, the city’s location along transportation routes connecting coastal areas with the highlands means it experiences some vehicular traffic. The terrain, gently sloping and interspersed with small valleys, can contribute to localized air stagnation, particularly during periods of calm weather, exacerbating the effects of local pollution sources.

San Jacinto de Buena Fe experiences a tropical rainforest climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The wet season, typically spanning from October to May, brings consistent rainfall and high humidity. During this period, air quality tends to be somewhat improved due to frequent precipitation washing away particulate matter and increased atmospheric mixing from rainfall-induced winds. However, persistent fog, common during the wet season, can trap pollutants near the ground, creating localized pockets of poor air quality. The dry season, from June to September, presents a different challenge. Reduced rainfall leads to lower atmospheric cleansing, and the lack of consistent wind patterns can result in stagnant air conditions. Agricultural burning, a prevalent practice during this time to prepare fields for planting, becomes a major contributor to elevated particulate pollution. Temperature inversions, where a layer of warm air sits above cooler air near the ground, are more frequent during the dry season, further trapping pollutants. The months of July and August are generally considered periods of heightened air quality concern. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during these months, particularly during the morning hours when pollutants tend to accumulate. Even during the wet season, short periods of agricultural burning can cause spikes in air pollution, so awareness of local agricultural practices is important. Maintaining indoor air quality through ventilation and air purification can offer some protection.