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Mercaderes, nestled in the department of Cauca, Colombia, occupies a geographically significant position within the Andean foothills. Located at approximately 1.8° N, 77.2° W and an elevation of around 1,800 meters (5,900 feet) above sea level, the city benefits from a temperate, highland climate. The surrounding landscape is dominated by steep slopes, verdant valleys, and the presence of smaller rivers and streams fed by the Andean watershed. This terrain significantly influences air circulation patterns; the valley setting can trap pollutants, particularly during periods of low wind. Mercaderes sits within a predominantly rural region, characterized by a gradual urban-rural gradient. While the immediate vicinity is agricultural, with coffee plantations and livestock farming being key economic activities, larger industrial zones are distant, located primarily in the major urban centers of Cali and Popayán. The proximity to agricultural lands introduces potential sources of particulate matter, stemming from agricultural burning practices, fertilizer application, and dust from unpaved roads. The city's relatively small size and limited industrial activity mean that local emissions from vehicles and small businesses are the primary contributors to air pollution. The mountainous terrain also impacts the dispersion of pollutants, creating localized areas of higher concentration, especially within the valley floor where Mercaderes is situated. The surrounding forests, while providing some natural air filtration, are not extensive enough to fully mitigate the impact of local emissions.

Mercaderes experiences a tropical highland climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The wet season, typically spanning from April to October, brings consistent rainfall and increased humidity. During this period, air quality generally improves due to frequent precipitation washing away particulate matter and increased wind speeds dispersing pollutants. However, the wet season can also bring challenges; increased moisture can exacerbate respiratory issues for sensitive individuals. The dry season, from November to March, sees significantly reduced rainfall and lower humidity. This period often witnesses a build-up of pollutants, particularly particulate matter, due to reduced precipitation and calmer wind conditions. Temperature inversions, common during the dry season, trap cooler air near the ground, preventing the vertical dispersion of pollutants. Agricultural burning, a practice sometimes employed to clear land for planting, can also contribute significantly to particulate pollution during this time. November and December often see the highest concentrations of particulate matter. Individuals with respiratory conditions, such as asthma or COPD, should exercise caution during these months, limiting outdoor activity during peak pollution periods, typically in the mornings. Children and the elderly are also particularly vulnerable. During the wettest months, while overall air quality is better, the increased humidity can still trigger respiratory problems in susceptible individuals. Maintaining indoor air quality through ventilation and air purifiers is advisable throughout the year, but especially during periods of elevated pollution.