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Susa, nestled within the Cundinamarca department of Colombia, occupies a unique geographic position in the Eastern Cordillera of the Andes. Located at coordinates 5.4528, -73.8140, the town sits at an elevation of approximately 2,520 meters (8,268 feet) above sea level. This high-altitude setting significantly influences its climate and, consequently, its air quality. The surrounding landscape is characterized by steep, verdant mountains, typical of the Colombian Andes, and a complex network of valleys. Susa is situated relatively close to the Guavio River reservoir, a major source of hydroelectric power and water for Bogotá, though the distance mitigates direct humidity impacts. The immediate area is predominantly agricultural, with coffee cultivation and small-scale farming dominating the land use. While not a major industrial hub itself, Susa’s proximity to larger towns and Bogotá introduces potential for long-range pollutant transport. The urban-rural gradient is quite sharp; the town itself is compact, transitioning rapidly into agricultural lands and then mountainous terrain. This topography can trap pollutants during periods of atmospheric stability, exacerbating local air quality issues. The valley location, combined with the Andes’ rain shadow effect, can also contribute to stagnant air conditions.

Susa experiences a relatively consistent, cool climate due to its high altitude, but distinct wet and dry seasons dictate air quality patterns. The drier periods, typically from December to February and July to August, coincide with increased agricultural activity – coffee harvesting and processing – which can elevate particulate matter from field work and drying processes. Lower rainfall during these months also means less atmospheric cleansing. Temperature inversions are common, particularly in the mornings and evenings, trapping pollutants in the valley. The wet seasons, spanning March-May and September-November, generally offer improved air quality as rainfall washes away pollutants. However, increased cloud cover can also lead to reduced sunlight, potentially increasing ground-level ozone formation if precursor pollutants are present. November often sees a build-up of moisture and potential for fog, which can trap pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the drier months and periods of temperature inversion. Outdoor activity is generally more favourable during the wetter seasons, but monitoring local conditions is always advised. The prevailing winds, typically from the east, can transport pollutants from surrounding areas, impacting Susa’s air quality regardless of the season.