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Coyhaique, nestled in the heart of Chilean Patagonia’s Aysén Region, occupies a unique and challenging geographic position profoundly influencing its air quality. Located at approximately -45.5667° latitude and -72.0667° longitude, the city sits on the shores of the Cisnes River, a tributary of the larger Baker River, and is surrounded by the Andes Mountains. This dramatic topography creates a natural bowl, often trapping pollutants under stable atmospheric conditions. The surrounding landscape is dominated by dense, temperate rainforests, glacial valleys, and rugged peaks reaching elevations well over 2,000 meters. Coyhaique’s elevation itself is around 150 meters above sea level, contributing to cooler temperatures and increased humidity. The urban character is relatively small-scale, a regional hub for the Aysén region, with a mix of residential areas, commercial zones, and limited industrial activity primarily focused on forestry and salmon farming. The urban–rural gradient is rapid; the city quickly transitions into expansive natural landscapes. While large-scale industrial belts are absent, localized emissions from wood-burning stoves (common for heating), vehicle traffic, and agricultural practices (particularly fertilizer use) contribute to localized air quality concerns. The proximity to the Baker River, a major glacial outflow, introduces moisture and influences local weather patterns, sometimes exacerbating fog formation which can trap pollutants. The prevailing westerly winds, typical of Patagonia, can also be blocked by the Andes, leading to stagnant air episodes.

Coyhaique’s air quality follows a distinct seasonal pattern dictated by its Patagonian climate. Winter (June-August) presents the most significant challenges. Cold temperatures necessitate widespread use of wood-burning stoves for heating, resulting in elevated particulate matter concentrations. Temperature inversions, common during winter nights, trap this smoke close to the ground, creating localized pollution hotspots. Fog, frequently occurring due to the high humidity and proximity to the Baker River, further compounds the issue by limiting pollutant dispersion. Spring (September-November) sees a gradual improvement as temperatures rise and wood stove usage decreases. However, agricultural activities, including fertilizer application, can contribute to ammonia emissions. Summer (December-February) generally offers the best air quality, with stronger winds dispersing pollutants and warmer temperatures reducing the need for heating. However, occasional wildfires in the surrounding forests can introduce smoke plumes, impacting air quality. Autumn (March-May) is a transitional period, with decreasing temperatures and increasing rainfall. While rainfall helps to cleanse the air, the onset of cooler weather can lead to a resurgence of wood smoke emissions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor activity on days with visible smoke. During wildfire season, monitoring local air quality reports and avoiding strenuous outdoor exercise is advisable. The region's unique microclimates, influenced by the Andes, can create localized variations in air quality, making it essential to stay informed about current conditions.