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Ráquira, nestled in the department of Boyacá, Colombia, occupies a unique geographic position within the Eastern Cordillera of the Andes. Situated at an elevation of approximately 2,880 meters (9,450 feet), the town is characterized by steep, rugged terrain and a cool, mountainous climate. This high altitude significantly influences air quality, as atmospheric pressure decreases with elevation, leading to lower oxygen concentrations and potentially increased pollutant concentrations. The surrounding landscape is dominated by rolling hills, agricultural lands – primarily dedicated to potato and maize cultivation – and patches of native páramo ecosystem. Ráquira isn’t directly adjacent to large bodies of water, though numerous smaller streams and rivers originate in the surrounding mountains, contributing to localized humidity. Unlike many Colombian cities, Ráquira lacks a significant industrial base; however, artisanal pottery production is a major economic activity, contributing to particulate matter emissions. The urban-rural gradient is sharp, with the town centre transitioning quickly into agricultural fields and then into the wilder páramo. This proximity to agricultural practices, including the burning of agricultural waste, and the town’s bowl-like topography, can trap pollutants, exacerbating air quality challenges. The prevailing winds, influenced by the Andean orography, play a crucial role in dispersing or concentrating these emissions.

Ráquira experiences a bimodal rainfall pattern rather than distinct seasons, with two wet seasons and two drier seasons. Air quality in Ráquira is most compromised during the drier periods, typically from December to February and July to August. During these months, reduced rainfall means less atmospheric cleansing, and agricultural burning for land preparation becomes more frequent, releasing significant amounts of particulate matter and other pollutants. Temperature inversions, common in mountainous valleys, are also more likely during the drier season, trapping pollutants near the ground. The wet seasons, from March to May and September to November, generally offer improved air quality due to increased precipitation washing pollutants from the atmosphere. However, increased humidity can also contribute to the formation of fog, potentially trapping pollutants at lower altitudes. Sensitive individuals, such as children, the elderly, and those with respiratory conditions, should limit strenuous outdoor activity during the drier months, particularly in the late afternoon when pollutant concentrations tend to peak. Monitoring local conditions and avoiding areas near agricultural burning are crucial preventative measures. The cooler temperatures throughout the year generally reduce ozone formation, but sunlight still drives photochemical reactions, so even during wet seasons, awareness is important.