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Azángaro, nestled in the Puno Region of southeastern Peru, occupies a geographically significant position within the high-altitude Altiplano. Located at approximately -14.91° latitude and -70.19° longitude, the city sits at an elevation of roughly 3,900 meters (12,800 feet) above sea level, placing it firmly within a zone of thin air and intense solar radiation. The surrounding landscape is dominated by the expansive, semi-arid plains of the Altiplano, punctuated by the snow-capped peaks of the Andes Mountains to the east. Lake Titicaca, the largest lake in South America by volume, lies approximately 30 kilometers (19 miles) to the northeast, influencing local microclimates and humidity levels, though its impact on Azángaro’s air quality is relatively limited due to distance and prevailing winds. The urban character of Azángaro is that of a regional hub, serving as a commercial and agricultural center for the surrounding rural communities. The immediate area is characterized by a gradual urban–rural gradient, transitioning from the built environment of the city to extensive agricultural lands used for potato and quinoa cultivation, and grazing pastures for livestock. While Azángaro itself lacks significant heavy industry, the broader Puno region experiences some mining activity, and agricultural practices, particularly burning of crop residues, can contribute to localized air pollution events. The terrain, generally flat with gentle slopes, can trap pollutants under certain meteorological conditions, exacerbating air quality challenges. The city’s location within a high-altitude basin contributes to temperature inversions, a key factor affecting pollutant dispersion.

Azángaro’s air quality is intimately linked to its distinct wet and dry seasons, a pattern typical of the Andean Altiplano. The dry season, generally spanning from April to October, is characterized by intense solar radiation, lower humidity, and relatively stable atmospheric conditions. Temperature inversions are frequent during this period, trapping pollutants close to the ground, particularly in the mornings and evenings. Agricultural burning, a common practice for land clearing and residue disposal, significantly contributes to particulate matter pollution during these months, with peak occurrences often observed in September and October. The wet season, from November to March, brings increased rainfall and higher humidity, which naturally helps to cleanse the air by washing away particulate matter. However, fog, a frequent occurrence during the wet season, can also trap pollutants, leading to periods of reduced visibility and localized air quality concerns. Wind patterns are generally light and variable, further contributing to the potential for pollutant accumulation. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Limiting outdoor exertion during the early morning and late evening hours, when inversions are most pronounced, is advisable. During the wet season, while overall air quality tends to improve, periods of dense fog necessitate similar precautions, especially for those with pre-existing respiratory ailments. Maintaining awareness of local weather conditions and agricultural practices is crucial for informed decision-making regarding outdoor activities.