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Sandoná occupies a distinctive topographical niche within the Nariño Department of southwestern Colombia, serving as a vital link between the high Andean peaks and the lower tropical depressions. Nestled amidst the undulating folds of the Andes, the municipality is defined by its rugged terrain, where steep slopes and deep valleys dictate the flow of both water and air. This complex verticality creates a highly fragmented urban-rural gradient, where the concentrated settlement of the town center is tightly hugged by expansive agricultural landscapes. The surrounding environment is dominated by coffee plantations, sugarcane fields, and diverse fruit orchards, which characterize the regional economy and land use patterns. This proximity to intensive agriculture is a critical factor in the local atmospheric profile, as the transition from dense vegetation to cultivated land introduces varying levels of organic aerosols. Geographically, Sandoná’s position within these mountainous corridors means that the local microclimate is heavily influenced by orographic lifting and valley-driven wind patterns. The lack of large bodies of water means that humidity is driven primarily by vegetation and seasonal precipitation rather than maritime influence. However, the surrounding mountain ridges act as physical barriers that can impede horizontal wind flow, potentially trapping localized emissions within the valley floor. Consequently, the urban character of Sandoná is inseparable from its geological setting, where the interplay between steep topography and agricultural activity creates a unique atmospheric environment that fluctuates significantly based on the seasonal movement of air masses through the Andean corridors, shaping the lived experience of its local residents.

In the tropical Andean climate of Sandoná, the traditional four-season model is replaced by a distinct wet and dry cycle, each profoundly impacting air quality. During the dry season, typically spanning from December to March and July to August, the atmosphere is prone to higher concentrations of particulate matter. This period is often marked by increased agricultural biomass burning and dust from unpaved rural roads, which can linger in the valleys. Temperature inversions are more frequent during these drier months, particularly in the early mornings, when cool air settles in the low-lying areas, trapping pollutants near the surface. Conversely, the wet season, characterized by heavy rainfall from April to June and October to November, provides a natural cleansing effect. Frequent precipitation and high humidity help wash aerosols and particulates from the sky, significantly improving air clarity. However, the heavy cloud cover and fog common during these months can occasionally restrict vertical air mixing, creating localized pockets of moisture-laden haze. For outdoor enthusiasts and sensitive populations, the dry months—specifically February and August—require greater caution, as the combination of low wind speeds and agricultural activity can elevate pollutant levels. In contrast, the rainy months offer the freshest air, though visibility may be reduced by mist. To manage health risks, sensitive individuals such as those with respiratory conditions should monitor local conditions during the dry season, perhaps favoring early morning activities when air circulation is typically more vigorous before the midday heat to ensure maximum respiratory comfort and safety for their daily routines.