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Otavalo, nestled in the Andean highlands of Ecuador’s Imbabura province, presents a unique geographic context influencing its air quality. Situated at an elevation of approximately 2,532 meters (8,307 feet), the city lies within a high-altitude basin surrounded by the majestic peaks of Imbabura, Cotacachi, and Cayambe volcanoes. This topography creates a bowl-like effect, potentially trapping pollutants during periods of atmospheric stability. The terrain is characterized by rolling hills and fertile volcanic soils, supporting a significant agricultural sector, particularly flower cultivation and livestock farming. The nearby Laguna de Cuicocha, a stunning caldera lake, adds to the region’s natural beauty but also contributes to localized humidity. While Otavalo isn’t heavily industrialized, the surrounding areas experience some small-scale manufacturing and artisanal activity. The urban-rural gradient is quite sharp; the city centre is densely populated, transitioning rapidly to agricultural lands and páramo ecosystems. This proximity to agricultural practices, including the burning of agricultural waste, and the reliance on wood-burning stoves for heating and cooking, are key factors impacting local air quality. The prevailing winds, influenced by the Andean orography, play a crucial role in pollutant dispersion, but the basin’s topography can limit their effectiveness.

Otavalo’s air quality follows a distinct wet and dry season pattern, dictated by the Andean climate. The dry season, generally from June to September, sees reduced rainfall and increased dust from agricultural activities and unpaved roads, leading to higher particulate matter concentrations. Temperature inversions are common during these months, trapping pollutants near the ground. This is often the least favourable time for outdoor activity, particularly for those with respiratory conditions. The wet season, from October to May, brings frequent rainfall which effectively washes away pollutants, improving air quality significantly. However, increased humidity can also promote the formation of mould and allergens. November and December often experience a transitional period with fluctuating conditions. February and March, being peak rainfall months, generally offer the cleanest air. During the wet season, the increased cloud cover can reduce solar radiation, impacting the formation of ground-level ozone. Sensitive groups – children, the elderly, and individuals with asthma – should be particularly cautious during the dry season, limiting strenuous outdoor activity and monitoring their health. Local burning practices, common after harvests, exacerbate pollution during both seasons, but are more noticeable when rainfall is limited.