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Puquio, nestled in the Ayacucho region of Peru, occupies a geographically significant position within the Andean highlands. Located at approximately -14.6939° latitude and -74.1241° longitude, the city sits at an elevation of roughly 3,250 meters (10,663 feet) above sea level, placing it firmly within the high-altitude Altiplano ecosystem. The surrounding landscape is characterized by a dramatic interplay of rugged mountains, deep valleys, and expansive plains, typical of the Peruvian Andes. The terrain is predominantly steep and uneven, influencing urban development patterns and limiting expansive growth. While Puquio itself lacks immediate proximity to major rivers or lakes, it draws water from smaller, seasonal streams and relies on groundwater resources, which can be impacted by regional agricultural practices. The city’s regional position is crucial; it serves as a vital link in transportation routes connecting Ayacucho with other parts of the country. The urban–rural gradient transitions rapidly from the town center to surrounding agricultural lands, where small-scale farming, primarily focused on potatoes, quinoa, and other hardy crops, is prevalent. Limited industrial activity exists within Puquio itself, primarily related to agricultural processing and small-scale workshops. However, the broader Ayacucho region experiences some mining activity, which, while distant, can contribute to regional dust and particulate matter transport. The high elevation and valley location contribute to a tendency for temperature inversions, a key factor influencing local air quality dynamics.

Puquio’s air quality experiences a distinct seasonal pattern dictated by its Andean climate. The region generally exhibits a wet and dry season, rather than the four traditional seasons. The dry season, typically spanning from May to September, often sees a build-up of pollutants. Reduced rainfall and increased solar radiation lead to higher surface temperatures, promoting photochemical reactions that can form ozone and other secondary pollutants. Furthermore, the frequent occurrence of temperature inversions during this period traps pollutants near the ground, exacerbating air quality concerns. Dust storms, originating from the surrounding arid plains, are also more common during the dry season, significantly increasing particulate matter concentrations. The wet season, from October to April, brings increased rainfall and higher humidity, which naturally scavenges pollutants from the atmosphere, leading to improved air quality. Stronger winds associated with the wet season also help disperse pollutants. Fog, common during the cooler months, can also trap pollutants, creating localized pockets of poor air quality. Outdoor activities are generally more favorable during the wet season, particularly from November to March. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, especially during periods of dust storms or when temperature inversions are present. Agricultural burning, a common practice in the surrounding rural areas, can also contribute to air pollution spikes, regardless of the season, and is particularly noticeable during harvest times.