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Catamayo, nestled in the Loja Province of Ecuador, occupies a geographically significant position within the Andean foothills, approximately 2,130 meters (7,000 feet) above sea level. The city’s location is characterized by a dramatic urban–rural gradient, transitioning rapidly from a compact, primarily residential core to sprawling agricultural lands and steep, forested slopes. The surrounding landscape is dominated by the Andes, with volcanic peaks punctuating the skyline, contributing to a microclimate influenced by orographic lift and localized precipitation patterns. While not directly adjacent to a major river, Catamayo benefits from several smaller streams and irrigation canals fed by Andean snowmelt, crucial for the region’s intensive agricultural activity, particularly coffee and banana cultivation. This agricultural belt, extending outwards from the city, represents a key factor in local air quality. The terrain itself, a mix of steep hillsides and relatively flat valley floors, influences air circulation; valleys can trap pollutants, while slopes can facilitate dispersion, though this is often limited by temperature inversions common at this altitude. The proximity to larger urban centers like Loja, approximately 30 kilometers north, introduces a degree of regional pollution transport. Industrial activity is limited within Catamayo itself, primarily consisting of small-scale processing related to agriculture, but the potential for emissions from nearby processing plants and transportation corridors remains a consideration. The city’s elevation and valley setting create a unique atmospheric profile, impacting pollutant behaviour and dispersion.

Catamayo experiences a tropical highland climate, exhibiting distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from June to November, often sees a relative improvement in air quality, although this is not always consistent. Reduced rainfall means less particulate matter is washed from the atmosphere, but the lack of cloud cover can lead to increased solar radiation and photochemical smog formation, particularly during periods of stagnant air. Temperature inversions are more frequent during these months, trapping pollutants close to the ground, especially in the valley. The wet season, from December to May, brings increased rainfall, which naturally helps to cleanse the air by removing particulate matter. However, agricultural burning, a common practice to clear land for planting, significantly contributes to elevated levels of smoke and particulate pollution during this period, often peaking in January and February. Fog, common during the wet season, can also exacerbate air quality issues by trapping pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during agricultural burning periods and be mindful of potential temperature inversions during the dry season. Outdoor activities are generally more favourable during the wetter months, although vigilance regarding agricultural smoke is still advised. The interplay of rainfall, agricultural practices, and atmospheric stability dictates the air quality narrative in Catamayo, creating a dynamic and seasonally-dependent environment.